Union City, CA Weather

Updated:  Sun, 01-Jun-2025 1:00am EDT 
  clear Temperature: 60.7°F   /hr Humidity: 74% Dew Point: 52.4 Wind: W  1.0 mph Gust: 1.0 mph Pressure: 29.830 inHg  Steady Rain Today: 0.00 in UV-index: 0.0  None

Volcanic Activity Reports

Volcanoes – The Watchers

• Low-level tremor and ice subsidence observed at Grímsvötn volcano, Iceland
  May 30 2025 at 14:27:00 UTC
  Low-level seismic tremor detected at Grímsfjall in recent days indicates possible internal water movement within the Grímsvötn subglacial lake system, southeast Iceland. The last eruption of this volcano took place in 2011 (VEI 4).

  Source

• The Weekly Volcanic Activity Report: May 21–27, 2025
  May 29 2025 at 12:59:00 UTC
  New activity/unrest was reported for two volcanoes from May 21 to 27, 2025. During the same period, ongoing activity was reported for 13 volcanoes.

  Source

• Lava fountains exceed 300 m (1 000 feet) as new eruptive episode begins at Kīlauea’s Halemaʻumaʻu crater, Hawaiʻi
  May 26 2025 at 03:43:01 UTC
  Episode 23 of the Halemaʻumaʻu eruption at Kīlauea volcano, Hawaiʻi, began at 16:15 HST on May 25, 2025, with lava fountains exceeding 300 m (1 000 feet) from the north vent.

  Source

Worldwide Volcano News

• Sakurajima Volcano Volcanic Ash Advisory: EXPLODED AT 20250601/0710Z OVER FL070 STNR OBS VA DTG: 01/0700Z
  Jun 1 2025 at 3:30 am EDT
  
  Satellite image of Sakurajima volcano on 1 Jun 2025
  
  


• Volcanoes Today, 1 Jun 2025: Santiaguito volcano, Semeru, Ibu, Sangay
  Jun 1 2025 at 1:00 am EDT
  


• Sangay Volcano Volcanic Ash Advisory: OCNL TO FRQT VA EMS. to 20000 ft (6100 m)
  Jun 1 2025 at 12:30 am EDT
  
  
  


• Semeru Volcano Volcanic Ash Advisory: ERUPTION LAST REPORTED AT 01/0211Z EST VA DTG: 01/0350Z
  Jun 1 2025 at 12:15 am EDT
  
  
  


• Santiaguito Volcano Volcanic Ash Advisory: NEW VA EMS to 14000 ft (4300 m)
  May 31 2025 at 10:30 pm EDT
  
  
  


• Ibu Volcano Volcanic Ash Advisory: VA TO FL070 OBS AT 31/2220Z MOV SW EST VA DTG: 31/2220Z to 7000 ft (2100 m)
  May 31 2025 at 6:45 pm EDT
  
  Satellite image of Ibu volcano on 31 May 2025
  
  


• Volcanic activity worldwide 31 May 2025: Santiaguito volcano, Fuego, Klyuchevskoy, Popocatépetl, Se...
  May 31 2025 at 5:00 pm EDT
  
  Map of today's active volcanoes
  Klyuchevskoy (Kamchatka): (31 May) Volcanic Ash Advisory Center Tokyo (VAAC) issued the following report: VA IS NOT IDENTIFIABLE IN SATELLITE IMAGERY.
  
  Shiveluch (Kamchatka): Volcanic Ash Advisory Center Tokyo (VAAC) issued the following report: VA IS NOT IDENTIFIABLE IN SATELLITE IMAGERY.
  
  Ibu (Halmahera, Indonesia): Volcanic Ash Advisory Center Darwin (VAAC) issued the following report: VA ERUPTION LAST REPORTED AT 31/1015Z EST VA DTG:31/1020Z
  
  Lewotolo (Lesser Sunda Islands): (31 May) Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Darwin warned about a volcanic ash plume that rose up to estimated 7000 ft (2100 m) altitude or flight level 070 .
  The full report is as follows: VA TO FL070 LAST REP AT 31/0117Z EST VA DTG:31/0730Z to 7000 ft (2100 m)
  
  Semeru (East Java, Indonesia): Volcanic Ash Advisory Center Darwin (VAAC) issued the following report: ERUPTION LAST REPORTED AT 31/0824Z EST VA DTG:31/1600Z
  
  Dukono (Halmahera): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Darwin warned about a volcanic ash plume that rose up to estimated 8000 ft (2400 m) altitude or flight level 080 .
  The full report is as follows: VA TO FL080 OBS AT 31/1650Z OBS VA DTG:31/1650Z to 8000 ft (2400 m)
  
  Popocatépetl (Central Mexico): Volcanic Ash Advisory Center Washington (VAAC) issued the following report: NO VA OBS
  
  Santiaguito (Guatemala): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Washington warned about a volcanic ash plume that rose up to estimated 13000 ft (4000 m) altitude or flight level 130 .
  The full report is as follows: NEW ASH EM to 13000 ft (4000 m)
  
  Fuego (Guatemala): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Washington warned about a volcanic ash plume that rose up to estimated 14000 ft (4300 m) altitude or flight level 140 .
  The full report is as follows: VA OBS IN WEBCAM to 14000 ft (4300 m)
  
  Nevado del Ruiz (Colombia): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Washington warned about a volcanic ash plume that rose up to estimated 19000 ft (5800 m) altitude or flight level 190 .
  The full report is as follows: VONA RPRT RCVD to 19000 ft (5800 m)
  
  Sangay (Ecuador): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Washington warned about a volcanic ash plume that rose up to estimated 20000 ft (6100 m) altitude or flight level 200 .
  The full report is as follows: LGT VA MOVG W to 20000 ft (6100 m)
  
  Reventador (Ecuador): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Washington warned about a volcanic ash plume that rose up to estimated 14000 ft (4300 m) altitude or flight level 140 .
  The full report is as follows: VA EMS PSBL to 14000 ft (4300 m)
  
  


• Shiveluch Volcano Volcanic Ash Advisory: VA IS NOT IDENTIFIABLE IN SATELLITE IMAGERY.
  May 31 2025 at 2:00 pm EDT
  
  
  


• Dukono Volcano Volcanic Ash Advisory: VA TO FL080 OBS AT 31/1650Z OBS VA DTG: 31/1650Z to 8000 ft (2400 m)
  May 31 2025 at 1:15 pm EDT
  
  Satellite image of Dukono volcano on 31 May 2025
  
  


• Sangay Volcano Volcanic Ash Advisory: LGT VA MOVG W to 20000 ft (6100 m)
  May 31 2025 at 12:45 pm EDT
  
  
  


• Semeru Volcano Volcanic Ash Advisory: ERUPTION LAST REPORTED AT 31/0824Z EST VA DTG: 31/1600Z
  May 31 2025 at 12:15 pm EDT
  
  
  


• Nevado del Ruiz Volcano Volcanic Ash Advisory: VONA RPRT RCVD to 19000 ft (5800 m)
  May 31 2025 at 10:30 am EDT
  
  
  


• Fuego Volcano Volcanic Ash Advisory: VA OBS IN WEBCAM to 14000 ft (4300 m)
  May 31 2025 at 10:15 am EDT
  
  
  


• Reventador Volcano Volcanic Ash Advisory: VA EMS PSBL to 14000 ft (4300 m)
  May 31 2025 at 9:15 am EDT
  
  
  


• Popocatépetl Volcano Volcanic Ash Advisory: NO VA OBS
  May 31 2025 at 7:30 am EDT
  
  
  


• Ibu Volcano Volcanic Ash Advisory: VA ERUPTION LAST REPORTED AT 31/1015Z EST VA DTG: 31/1020Z
  May 31 2025 at 6:45 am EDT
  
  
  


• Santiaguito Volcano Volcanic Ash Advisory: NEW ASH EM to 13000 ft (4000 m)
  May 31 2025 at 6:15 am EDT
  
  
  


• Sangay Volcano Volcanic Ash Advisory: OCNL EM PSBL
  May 31 2025 at 4:00 am EDT
  
  
  


• Lewotolo Volcano Volcanic Ash Advisory: VA TO FL070 LAST REP AT 31/0117Z EST VA DTG: 31/0730Z to 7000 ft (2100 m)
  May 31 2025 at 4:00 am EDT
  
  
  


• Volcanic activity worldwide 30 May 2025: Santiaguito volcano, Semeru, Shiveluch, Ibu, Dukono, Marapi...
  May 30 2025 at 5:00 pm EDT
  
  Map of today's active volcanoes
  Shiveluch (Kamchatka): (30 May) Volcanic Ash Advisory Center Tokyo (VAAC) issued the following report: VA IS NOT IDENTIFIABLE IN SATELLITE IMAGERY.
  
  Sakurajima (Kyushu, Japan): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Tokyo warned about a volcanic ash plume that rose up to estimated 14000 ft (4300 m) altitude or flight level 140 and is moving at 15 kts in S direction.
  The full report is as follows: VA CONTINUOUSLY OBS IN SATELLITE IMAGERY OBS VA DTG:30/1720Z to 14000 ft (4300 m)
  
  Ibu (Halmahera, Indonesia): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Darwin warned about a volcanic ash plume that rose up to estimated 7000 ft (2100 m) altitude or flight level 070 and is moving at 05 kts in W direction.
  The full report is as follows: VA TO FL070 LAST REPORTED AT 30/0553Z EST VA DTG:30/1020Z to 7000 ft (2100 m)
  
  Lewotolo (Lesser Sunda Islands): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Darwin warned about a volcanic ash plume that rose up to estimated 7000 ft (2100 m) altitude or flight level 070 .
  The full report is as follows: VA TO FL070 LAST REPORTED AT 30/0702Z EST VA DTG:30/1310Z to 7000 ft (2100 m)
  
  Semeru (East Java, Indonesia): Volcanic Ash Advisory Center Darwin (VAAC) issued the following report: ERUPTION LAST REP AT 30/1157Z EST VA DTG:30/1600Z
  
  Marapi (Western Sumatra, Indonesia): Volcanic Ash Advisory Center Darwin (VAAC) issued the following report: ERUPTION REPORTED AT 30/1536Z.
  
  Dukono (Halmahera): (29 May) Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Darwin warned about a volcanic ash plume that rose up to estimated 8000 ft (2400 m) altitude or flight level 080 and is moving at 10 kts in NW direction.
  The full report is as follows: CONTINUOUS VA TO FL080 OBS AT 29/2250Z EXTD NW to 8000 ft (2400 m)
  
  Santiaguito (Guatemala): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Washington warned about a volcanic ash plume that rose up to estimated 17000 ft (5200 m) altitude or flight level 170 .
  The full report is as follows: INTMT VA EM to 17000 ft (5200 m)
  
  Nevado del Ruiz (Colombia): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Washington warned about a volcanic ash plume that rose up to estimated 18000 ft (5500 m) altitude or flight level 180 .
  The full report is as follows: NEW VA EMS. to 18000 ft (5500 m)
  
  Sangay (Ecuador): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Washington warned about a volcanic ash plume that rose up to estimated 20000 ft (6100 m) altitude or flight level 200 .
  The full report is as follows: ONGOING VA EMS. to 20000 ft (6100 m)
  
  Reventador (Ecuador): Volcanic Ash Advisory Center Washington (VAAC) issued the following report: PSBL VA EMS
  Volcano Activity Summary for 30 May 2025:
  Satellite image of Shiveluch volcano on 30 May 2025
  
  


• Volcanic activity worldwide 29 May 2025: Santiaguito volcano, Klyuchevskoy, Semeru, Shiveluch, Ibu, ...
  May 29 2025 at 5:00 pm EDT
  
  Map of today's active volcanoes
  Klyuchevskoy (Kamchatka): (29 May) Volcanic Ash Advisory Center Tokyo (VAAC) issued the following report: ERUPTION AT 20250528/2235Z FL200 EXTD SW REPORTED OBS VA DTG:29/0240Z
  
  Shiveluch (Kamchatka): Volcanic Ash Advisory Center Tokyo (VAAC) issued the following report: VA AT 20250529/1959Z FL140 EXTD E MOV 10KT REPORTED
  
  Sakurajima (Kyushu, Japan): (29 May) Volcanic Ash Advisory Center Tokyo (VAAC) issued the following report: EXPLODED AT 20250529/0637Z OVER FL060 EXTD SW OBS VA DTG:29/0630Z
  
  Ibu (Halmahera, Indonesia): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Darwin warned about a volcanic ash plume that rose up to estimated 7000 ft (2100 m) altitude or flight level 070 and is moving at 05 kts in NW direction.
  The full report is as follows: VA TO FL070 LAST REPORTED 29/0922Z EST VA DTG:29/1020Z to 7000 ft (2100 m)
  
  Lewotolo (Lesser Sunda Islands): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Darwin warned about a volcanic ash plume that rose up to estimated 7000 ft (2100 m) altitude or flight level 070 and is moving at 10 kts in NW direction.
  The full report is as follows: VA TO FL070 REPORTED AT 29/0839Z EST VA DTG:29/0910Z to 7000 ft (2100 m)
  
  Semeru (East Java, Indonesia): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Darwin warned about a volcanic ash plume that rose up to estimated 14000 ft (4300 m) altitude or flight level 140 and is moving at 10 kts in NW direction.
  The full report is as follows: VA TO FL140 LAST REPORTED AT 29/0353Z EST VA DTG:29/1000Z to 14000 ft (4300 m)
  
  Dukono (Halmahera): Volcanic Ash Advisory Center Darwin (VAAC) issued the following report: CONTINUOUS VA TO FL080 LAST REPORTED 29/0750Z EXTD NW
  
  Santiaguito (Guatemala): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Washington warned about a volcanic ash plume that rose up to estimated 13000 ft (4000 m) altitude or flight level 130 .
  The full report is as follows: OCNL VA EMS. to 13000 ft (4000 m)
  
  Sangay (Ecuador): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Washington warned about a volcanic ash plume that rose up to estimated 21000 ft (6400 m) altitude or flight level 210 .
  The full report is as follows: VA EMS PSBLY CONTG. to 21000 ft (6400 m)
  
  Reventador (Ecuador): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Washington warned about a volcanic ash plume that rose up to estimated 15000 ft (4600 m) altitude or flight level 150 .
  The full report is as follows: LKLY VA EMS to 15000 ft (4600 m)
  
  


• Volcanic activity worldwide 28 May 2025: Santiaguito volcano, Klyuchevskoy, Semeru, Shiveluch, Ibu, ...
  May 28 2025 at 6:00 pm EDT
  
  Map of today's active volcanoes
  Klyuchevskoy (Kamchatka): Volcanic Ash Advisory Center Tokyo (VAAC) issued the following report: VA AT 20250528/1900Z FL200 EXTD SW MOV 5KT REPORTED
  
  Shiveluch (Kamchatka): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Tokyo warned about a volcanic ash plume that rose up to estimated 14000 ft (4300 m) altitude or flight level 140 and is moving at 5 kts in W direction.
  The full report is as follows: VA EMISSIONS CONTINUING OBS VA DTG:28/1120Z to 14000 ft (4300 m)
  
  Ibu (Halmahera, Indonesia): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Darwin warned about a volcanic ash plume that rose up to estimated 7000 ft (2100 m) altitude or flight level 070 and is moving at 05 kts in NW direction.
  The full report is as follows: VA TO FL070 LAST REPORTED AT 28/1450Z MOV NW to 7000 ft (2100 m)
  
  Lewotolo (Lesser Sunda Islands): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Darwin warned about a volcanic ash plume that rose up to estimated 5000 ft (1500 m) altitude or flight level 050 and is moving at 05 kts in NW direction.
  The full report is as follows: VA TO FL050 REPORTED FM GND 28/1004Z MOV NW to 5000 ft (1500 m)
  
  Semeru (East Java, Indonesia): Volcanic Ash Advisory Center Darwin (VAAC) issued the following report: ERUPTION LAST REPORTED AT 28/0617Z EST VA DTG:28/1000Z
  
  Dukono (Halmahera): (27 May) Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Darwin warned about a volcanic ash plume that rose up to estimated 8000 ft (2400 m) altitude or flight level 080 .
  The full report is as follows: VA TO FL080 OBS AT 27/2250Z MOV NW OBS VA DTG:27/2250Z to 8000 ft (2400 m)
  
  Santiaguito (Guatemala): Mild explosive activity continues from the volcano. The Volcanic Ash Advisory Center (VAAC) Washington reported intermittent emissions of volcanic ash plumes.
  The full report is as follows: sporadic emissions of volcanic ash
  
  Sangay (Ecuador): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Washington warned about a volcanic ash plume that rose up to estimated 23000 ft (7000 m) altitude or flight level 230 .
  The full report is as follows: VA EMS CONT to 23000 ft (7000 m)
  
  Reventador (Ecuador): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Washington warned about a volcanic ash plume that rose up to estimated 15000 ft (4600 m) altitude or flight level 150 .
  The full report is as follows: ONGOING VA EMS. to 15000 ft (4600 m)
  Volcano Activity Summary for 28 May 2025:
  
  


• Home Reef volcano (Tonga) - Smithsonian / USGS Weekly Volcanic Activity Report for 21 May-27 May 2025 (Continuing Activity)
  May 28 2025 at 10:00 am EDT
  

  The Tonga Geological Services reported that the eruption at Home Reef continued during 11-24 May, though satellite observations suggested decreasing activity. Thermal anomalies were last detected on 4 May and no visible ash emissions were identified in a 15 May image, though discolored water surrounding the island suggested submarine activity. Evidence for explosive activity during 20-21 May included new tephra deposits on the cone’s flanks and low-level ash plumes.
  Weather clouds often obscured views. Infrasound instruments did not detect any signals. The Aviation Color Code remained at Yellow (the second lowest level on a four-level scale, the Maritime Alert Level remained at Orange (the third level on a four-level scale) with advice to stay at least 2 nautical miles (3.7 km) from the island, and the Alert Level for residents of Vava’u and Ha’apai remained at Green (the first level on a four-level scale).
  
  Source: Tonga Geological Services, Government of Tonga
  ---
  From: Global Volcanism Program, 2025. Report on Home Reef (Tonga). In: Mayberry, G (ed.), Weekly Volcanic Activity Report 21 May-27 May 2025. Smithsonian Institution and US Geological Survey.

  
  


• Karymsky volcano (Russia) - Smithsonian / USGS Weekly Volcanic Activity Report for 21 May-27 May 2025 (Continuing Activity)
  May 28 2025 at 10:00 am EDT
  

  The Kamchatkan Volcanic Eruption Response Team (KVERT) reported that, in general, moderate explosive activity continued at Karymsky during 15-22 May. A thermal anomaly over the volcano was identified in satellite images during 16-18, 20, and 22 May; weather clouds obscured views on other days. The Aviation Color Code remained at Orange (the third level on a four-color scale).
  Dates are based on UTC; specific events are in local time where noted.
  
  Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
  ---
  From: Global Volcanism Program, 2025. Report on Karymsky (Russia). In: Mayberry, G (ed.), Weekly Volcanic Activity Report 21 May-27 May 2025. Smithsonian Institution and US Geological Survey.

  
  


• Great Sitkin volcano (United States) - Smithsonian / USGS Weekly Volcanic Activity Report for 21 May-27 May 2025 (Continuing Activity)
  May 28 2025 at 10:00 am EDT
  

  The Alaska Volcano Observatory (AVO) reported that slow lava effusion continued to feed a thick flow in Great Sitkin’s summit crater during 21-27 May; a 22 May radar image confirmed that lava was slowly advancing. Small daily earthquakes were detected by the seismic network. Weather clouds sometimes obscured views of the volcano.
  The Volcano Alert Level remained at Watch (the third level on a four-level scale) and the Aviation Color Code remained at Orange (the third color on a four-color scale).
  
  Source: US Geological Survey Alaska Volcano Observatory (AVO)
  ---
  From: Global Volcanism Program, 2025. Report on Great Sitkin (United States). In: Mayberry, G (ed.), Weekly Volcanic Activity Report 21 May-27 May 2025. Smithsonian Institution and US Geological Survey.

  
  


• Ahyi volcano (United States) - Smithsonian / USGS Weekly Volcanic Activity Report for 21 May-27 May 2025 (Continuing Activity)
  May 28 2025 at 10:00 am EDT
  

  No activity at the Ahyi Seamount was detected in either satellite or acoustic data from underwater pressure sensors near Wake Island (about 2,270 km E) during 17-23 May, though unrest continued. The Exploration Vessel Nautilus visited the area and deployed a remotely operated vehicle (ROV) on 19 May. The observations confirmed that lava had erupted over the past few years, building the summit to within 50-60 m of the ocean surface.
  Ahyi remained active with vigorous degassing of bubbles observed across a broad area of the summit. The Aviation Color Code remained at Yellow (the second lowest level on a four-color scale) and the Volcano Alert Level remained at Advisory (the second lowest level on a four-level scale).
  
  Source: US Geological Survey
  ---
  From: Global Volcanism Program, 2025. Report on Ahyi (United States). In: Mayberry, G (ed.), Weekly Volcanic Activity Report 21 May-27 May 2025. Smithsonian Institution and US Geological Survey.

  
  


• Kanlaon volcano (Philippines) - Smithsonian / USGS Weekly Volcanic Activity Report for 21 May-27 May 2025 (New Activity / Unrest)
  May 28 2025 at 10:00 am EDT
  

  The Philippine Institute of Volcanology and Seismology (PHIVOLCS) reported continuing unrest at Kanlaon during 20-26 May. The seismic network recorded 1-31 daily volcanic earthquakes. Daily sulfur dioxide emissions ranged from 653 to 1,836 tonnes per day.
  Gas-and-steam emissions generally rose 75-700 m above the crater rim and drifted NW, W, SW, and SSW. According to Civil Defense PH, heavy rain on 22 May generated lahars that overflowed the Tamburong creek at the Tamburong Bridge in Barangay Biaknabato. The lahar deposits, consisting of mud and volcanic debris, blocked the Biaknabato Bridge and a portion of the Biaknabato Highway in La Castellana.
  The Alert Level remained at 3 (on a scale of 0-5); the public was warned to stay 6 km away from the summit and pilots were warned not to fly close to the volcano.
  
  Sources: Philippine Institute of Volcanology and Seismology (PHIVOLCS), Office of Civil Defense, Republic of the Philippines
  ---
  From: Global Volcanism Program, 2025. Report on Kanlaon (Philippines). In: Mayberry, G (ed.), Weekly Volcanic Activity Report 21 May-27 May 2025. Smithsonian Institution and US Geological Survey.

  
  


• Lewotobi volcano (Indonesia) - Smithsonian / USGS Weekly Volcanic Activity Report for 21 May-27 May 2025 (New Activity / Unrest)
  May 28 2025 at 10:00 am EDT
  

  In a special 25 May report the Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG) stated that eruptive activity at Lewotobi Laki-laki had decreased after the larger 18 May eruption and subsequent ash plumes and crater incandescence observed during 19-20 May. Seismicity indicated decreasing surface activity and magmatic recharge at depth during 20-25 May, and tiltmeter data indicated deflation. No rumbling was heard and no incandescence was visible at the summit.
  An eruptive event at 0649 on 23 May produced a dense gray ash plume that rose around 300 m above the summit and drifted SW and W. Later that day a drone flight over the summit revealed that dark lava had filled the crater, covering about 87,000 square meters. At 0900 on 25 May the Alert Level was lowered to 3 on a scale of 1-4) and the public was warned to stay 6 km away from the center of Laki-laki.
  White steam-and-gas plumes rose as high as 800 m above the crater rim and drifted in various directions during 25-28 May.
  
  Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
  ---
  From: Global Volcanism Program, 2025. Report on Lewotobi (Indonesia). In: Mayberry, G (ed.), Weekly Volcanic Activity Report 21 May-27 May 2025. Smithsonian Institution and US Geological Survey.

  
  


• Aira volcano (Japan) - Smithsonian / USGS Weekly Volcanic Activity Report for 21 May-27 May 2025 (Continuing Activity)
  May 28 2025 at 10:00 am EDT
  

  The Japan Meteorological Agency (JMA) reported ongoing eruptive activity at Minamidake Crater (Aira Caldera’s Sakurajima volcano) during 19-28 May. The seismic network recorded 44 eruptive events and 38 explosions during 19-23 May that produced ash plumes rising up to 3 km above the crater rim and drifting N; the tallest plume followed an explosion at 1500 on 20 May. Large blocks from the explosions were ejected as far as 1.2 km from the crater rim.
  Sulfur dioxide emissions were extremely high, averaging 11,200 tons per day (t/d) on 20 May and 4,300 t/d on 22 May. Deformation data indicated continuing inflation. Only very small eruptive events were recorded during 26-28 May.
  The Alert Level remained at 3 (on a 5-level scale), and the public was warned to be cautious within 2 km of both the Minimadake and Showa craters.
  
  Source: Japan Meteorological Agency (JMA)
  ---
  From: Global Volcanism Program, 2025. Report on Aira (Japan). In: Mayberry, G (ed.), Weekly Volcanic Activity Report 21 May-27 May 2025. Smithsonian Institution and US Geological Survey.

  
  


• Kilauea volcano (United States) - Smithsonian / USGS Weekly Volcanic Activity Report for 21 May-27 May 2025 (Continuing Activity)
  May 28 2025 at 10:00 am EDT
  

  The Hawaiian Volcano Observatory (HVO) reported that the eruption within Kilauea’s Kaluapele summit caldera, characterized by episodic fountaining from two vents along the SW margin of Halema’uma’u Crater, continued at variable levels during 21-27 May. Incandescence at both the N and S vents was visible during 20-25 May, along with intermittent spattering at both vents and occasional dome fountaining at the N vent. Large yellow flames from burning hydrogen gas sometimes rose from the N vent.
  The sulfur dioxide emission rate averaged around 1,200 tonnes per day (t/d), similar to rates recorded during prior pauses between high fountaining events. After midday on 24 May minor fountaining at the N vent as high as 65 m was accompanied by lava overflowing the cone onto the crater floor. Strong incandescence and periodic vigorous spattering at both vents was visible in the afternoon of 24 May and overnight during 24-25 May.
  Lava fountaining at the N vent and an overspill of lava onto the crater floor also occurred overnight.
  
  
  
  Narrow lava jets rose from the N vent on 25 May and became sustained fountains at 1615 which quickly began to cover the crater floor with lava flows. The activity escalated to fountains over 300 m tall within 30 minutes. Fountaining at the S vent began at 1720 and grew rapidly, reaching sustained heights of about 250 m.
  The fountains produced an eruptive plume heavily laden with tephra (ash, scoria, and Pele's hair) that reached at least 4.3 km in height. Sulfur dioxide emission rates were estimated to be 50,000-75,000 t/d based on webcam images from the Mauna Loa summit. Both vents produced lava flows that covered about half of the crater floor.
  After about six hours of sustained fountaining, the N vent stopped erupting at 2148, and the S vent stopped erupting at approximately 2225 on 25 May. Strands of Pele’s hair were present throughout the summit area of Hawai’i Volcanoes National Park and surrounding communities. The Volcano Alert Level remained at Watch (the third level on a four-level scale) and the Aviation Color Code remained at Orange (the third color on a four-color scale).
  
  Source: US Geological Survey Hawaiian Volcano Observatory (HVO)
  ---
  From: Global Volcanism Program, 2025. Report on Kilauea (United States). In: Mayberry, G (ed.), Weekly Volcanic Activity Report 21 May-27 May 2025. Smithsonian Institution and US Geological Survey.

  
  


• Semeru volcano (Indonesia) - Smithsonian / USGS Weekly Volcanic Activity Report for 21 May-27 May 2025 (Continuing Activity)
  May 28 2025 at 10:00 am EDT
  

  The Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG) reported that activity continued at Semeru during 21-27 May, with multiple daily eruptive events recorded by the seismic network. Daily white-and-gray ash plumes rose 400-1,200 m above the summit and drifted in multiple directions. The Alert Level remained at 2 (the second lowest level on a scale of 1-4).
  The public was warned to stay at least 3 km away from the summit in all directions, 8 km from the summit to the SE, 500 m from the banks of the Kobokan drainage as far as 13 km from the summit, and to avoid other drainages including the Bang, Kembar, and Sat, due to lahar, avalanche, and pyroclastic flow hazards.
  
  Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
  ---
  From: Global Volcanism Program, 2025. Report on Semeru (Indonesia). In: Mayberry, G (ed.), Weekly Volcanic Activity Report 21 May-27 May 2025. Smithsonian Institution and US Geological Survey.

  
  


• Sheveluch volcano (Russia) - Smithsonian / USGS Weekly Volcanic Activity Report for 21 May-27 May 2025 (Continuing Activity)
  May 28 2025 at 10:00 am EDT
  

  The Kamchatkan Volcanic Eruption Response Team (KVERT) reported that lava extrusion may have continued at Sheveluch’s “300 years of RAS” dome on the SW flank of Old Sheveluch and at the Young Sheveluch dome during 15-22 May. Thermal anomalies over the domes were identified almost daily in satellite images; weather clouds sometimes obscured views, especially during the second half of the week. The Far Eastern Branch of the Russian Academy of Sciences (FEB RAS) reported that explosive activity was recorded by infrasound instruments on 16 May, with ash plumes that rose as high as 4.7 km above the summit and drifted NE.
  KVERT noted that ash plumes drifted 835 km NE and 185 km SE during 16-18 May. The Aviation Color Code remained at Orange (the second highest level on a four-color scale). Dates are based on UTC; specific events are in local time where noted.
  
  Sources: Kamchatkan Volcanic Eruption Response Team (KVERT), Institute of Volcanology and Seismology (IVS) of the Far Eastern Branch of the Russian Academy of Sciences (FEB RAS)
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  From: Global Volcanism Program, 2025. Report on Sheveluch (Russia). In: Mayberry, G (ed.), Weekly Volcanic Activity Report 21 May-27 May 2025. Smithsonian Institution and US Geological Survey.

  
  


• Kirishimayama volcano (Japan) - Smithsonian / USGS Weekly Volcanic Activity Report for 21 May-27 May 2025 (Continuing Activity)
  May 28 2025 at 10:00 am EDT
  

  The Japan Meteorological Agency (JMA) reported that increased unrest at Shinmoedake (Shinmoe peak, a stratovolcano of the Kirishimayama volcano group) during March through early May had stabilized. Volcanic earthquakes with epicenters beneath Shinmoedake began to increase on 28 March and tiltmeter data indicated inflation on 30 March. During 22-26 April minor NW tilt was observed in inclinometer data and the number of earthquakes further increased.
  Volcanic tremor was detected on 27 April and during 1-2 May. During the first half of May seismicity remained high but did not significantly increase, and there were no changes detected in tiltmeter data. At 1100 on 27 May the Alert Level was lowered to 2 (on a 5-level scale) and the public was warned to exercise caution within 2 km from Shinmoedake Crater.
  
  Source: Japan Meteorological Agency (JMA)
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  From: Global Volcanism Program, 2025. Report on Kirishimayama (Japan). In: Mayberry, G (ed.), Weekly Volcanic Activity Report 21 May-27 May 2025. Smithsonian Institution and US Geological Survey.

  
  


• Poas volcano (Costa Rica) - Smithsonian / USGS Weekly Volcanic Activity Report for 21 May-27 May 2025 (Continuing Activity)
  May 28 2025 at 10:00 am EDT
  

  The Observatorio Vulcanológico y Sismológico de Costa Rica-Universidad Nacional (OVSICORI-UNA) reported continuing gas-and-steam emissions at Poás during 21-27 May; ash content of the plumes was either very low or not present. Sulfur dioxide gas emissions remained at high levels, though they had decreased compared to the previous week. The emissions detected in satellite data drifting SW on 20 May were estimated to be 598 tonnes per day (t/d).
  The fixed Differential Optical Absorption Spectroscopy (DOAS) station recorded slightly lower averages compared to the previous week, averaging around 309 t/d during 17-23 May, and a transect using a mobile DOAS instrument recorded 3,000 t/d on 22 May, similar to the previous week. Intense incandescence continued to be visible at both Boca A and Boca C vents. On 21 May the temperature at Boca A was measured with an infrared sensor mounted on a drone, revealing a maximum temperature of 470 degrees Celsius.
  Water continued pooling at Boca C. Pulses in acoustic data during 26-27 May likely originated from bubbling at Boca C. The volcano’s Alert Level remained at 3 (the second highest level on a four-level scale).
  
  Source: Observatorio Vulcanologico y Sismologico de Costa Rica-Universidad Nacional (OVSICORI-UNA)
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  From: Global Volcanism Program, 2025. Report on Poas (Costa Rica). In: Mayberry, G (ed.), Weekly Volcanic Activity Report 21 May-27 May 2025. Smithsonian Institution and US Geological Survey.

  
  


• Merapi volcano (Indonesia) - Smithsonian / USGS Weekly Volcanic Activity Report for 21 May-27 May 2025 (Continuing Activity)
  May 28 2025 at 10:00 am EDT
  

  The Balai Penyelidikan dan Pengembangan Teknologi Kebencanaan Geologi (BPPTKG) reported that the eruption at Merapi (on Java) continued during 16-22 May. Seismicity remained at high levels. The SW lava dome produced 41 lava avalanches that traveled as far as 2 km SW down the Bebeng drainage, 10 that traveled as far as 1.8 km SW down the Krasak drainage, and 73 that traveled as far as 2 km W down the Sat/Putih drainage.
  Small morphological changes to the SW lava dome resulted from continuing effusion and minor collapses. The Alert Level remained at 3 (on a scale of 1-4), and the public was warned to stay 3-7 km away from the summit, based on location.
  
  Source: Balai Penyelidikan dan Pengembangan Teknologi Kebencanaan Geologi (BPPTKG)
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  From: Global Volcanism Program, 2025. Report on Merapi (Indonesia). In: Mayberry, G (ed.), Weekly Volcanic Activity Report 21 May-27 May 2025. Smithsonian Institution and US Geological Survey.

  
  


• Lewotolok volcano (Indonesia) - Smithsonian / USGS Weekly Volcanic Activity Report for 21 May-27 May 2025 (Continuing Activity)
  May 28 2025 at 10:00 am EDT
  

  The Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG) reported that an eruption at Lewotolok was ongoing during 21-27 May. Daily white steam-and-gas plumes rose as high as 700 m above the summit of the cone and drifted NW and W. Gray ash plumes rose 100-500 m above the summit and drifted SE, NW, and W during 23 and 25-27 May.
  Clear nighttime webcam images showed incandescent material at the summit cone and on the upper S flank. The Alert Level remained at 2 (on a scale of 1-4) and the public was warned to stay 2 km away from the vent and 2.5 km away on the S, SE, and W flanks.
  
  Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
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  From: Global Volcanism Program, 2025. Report on Lewotolok (Indonesia). In: Mayberry, G (ed.), Weekly Volcanic Activity Report 21 May-27 May 2025. Smithsonian Institution and US Geological Survey.

  
  


• Marapi volcano (Indonesia) - Smithsonian / USGS Weekly Volcanic Activity Report for 21 May-27 May 2025 (Continuing Activity)
  May 28 2025 at 10:00 am EDT
  

  The Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG) reported that eruptive activity at Marapi (on Sumatra) continued during 21-27 May, characterized by occasional dense ash plumes. White plumes rose 100-200 m above the summit and drifted in multiple directions during 21-22 and 24 May. Eruptive events were recorded at 1227 on 23 May and at 1457 on 26 May, though weather conditions prevented visual confirmation.
  On 25 May white-and-brown plumes rose 100-250 m above the summit and drifted E and SE. At 0822 on 27 May a dense white-and-gray ash plume rose 1.2 km above the summit and drifted SE. The Alert Level remained at 2 (on a scale of 1-4) and the public was warned to stay 3 km away from the active crater.
  
  Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
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  From: Global Volcanism Program, 2025. Report on Marapi (Indonesia). In: Mayberry, G (ed.), Weekly Volcanic Activity Report 21 May-27 May 2025. Smithsonian Institution and US Geological Survey.

  
  


• Volcanic activity worldwide 27 May 2025: Santiaguito volcano, Klyuchevskoy, Semeru, Shiveluch, Ibu, ...
  May 27 2025 at 5:00 pm EDT
  
  Map of today's active volcanoes
  Klyuchevskoy (Kamchatka): (27 May) Volcanic Ash Advisory Center Tokyo (VAAC) issued the following report: VA AT 20250527/0029Z FL140 EXTD W MOV 25KT REPORTED
  
  Shiveluch (Kamchatka): Volcanic Ash Advisory Center Tokyo (VAAC) issued the following report: VA AT 20250527/2030Z FL140 EXTD E MOV 5KT REPORTED OBS VA DTG:27/2030Z
  
  Ibu (Halmahera, Indonesia): (26 May) Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Darwin warned about a volcanic ash plume that rose up to estimated 7000 ft (2100 m) altitude or flight level 070 .
  The full report is as follows: VA TO FL070 OBS AT 26/2220Z MOV SSW OBS VA DTG:26/2220Z to 7000 ft (2100 m)
  
  Lewotolo (Lesser Sunda Islands): (27 May) Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Darwin warned about a volcanic ash plume that rose up to estimated 7000 ft (2100 m) altitude or flight level 070 and is moving at 05 kts in SW direction.
  The full report is as follows: VA TO FL070 REPORTED AT 27/0014Z EST VA DTG:27/0030Z to 7000 ft (2100 m)
  
  Semeru (East Java, Indonesia): Volcanic Ash Advisory Center Darwin (VAAC) issued the following report: ERUPTION LAST REPORTED AT 27/0907Z EST VA DTG:27/1000Z
  
  Marapi (Western Sumatra, Indonesia): (27 May) Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Darwin warned about a volcanic ash plume that rose up to estimated 14000 ft (4300 m) altitude or flight level 140 .
  The full report is as follows: VA OBS TO TO FL140 AT 27/0030Z MOV SE OBS VA DTG:27/0130Z to 14000 ft (4300 m)
  
  Dukono (Halmahera): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Darwin warned about a volcanic ash plume that rose up to estimated 8000 ft (2400 m) altitude or flight level 080 and is moving at 05 kts in W direction.
  The full report is as follows: VA TO FL080 LAST REPORTED 27/0436Z EST VA DTG:27/1050Z to 8000 ft (2400 m)
  
  White Island (New Zealand): (27 May) Over the past two weeks, webcam images have consistently shown a steam and gas plume emerging from the active vent. However, confirming the presence of ash has proven difficult. During this same period, our colleagues at MetService have not detected ash in the plume using satellite imagery. This suggests that if ash is still being emitted, it is occurring at a lower intensity than in previous weeks.
  Due to poor weather conditions, it was unable to carry out scheduled gas and observation flights, limiting ability to directly assess the state of the active vent or confirm any substantial ash emissions. Satellite data has not indicated any significant concentrations of ash in the atmosphere during this time, although small amounts of ash may go undetected. Sulphur dioxide (SO₂) gas emissions from the active vent at Whakaari/White Island continue at moderate levels.
  ... [read more] ... [show less]
  As soon as conditions permit, we plan to conduct observation and gas measurement flights. These will provide updated visual assessments of the vent’s morphology and activity, as well as measurements of gas flux and vent temperatures. In the meantime, satellite monitoring continues to track SO₂ emissions. The Te Kaha and Whakatāne webcams remain valuable sources for observing plume activity, although visibility can be affected by local weather conditions along the Bay of Plenty coast.
  Overall, steam and gas emissions appear steady, continuing the trend observed over recent months. The level of volcanic ash may be declining. However, in the absence of on-island monitoring, rapid changes in activity cannot be ruled out. Current observations are consistent with minor but possibly decreasing eruptive activity. The Volcanic Alert Level remains at 3 and the Aviation Colour Code at Orange.
  
  
  Santiaguito (Guatemala): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Washington warned about a volcanic ash plume that rose up to estimated 14000 ft (4300 m) altitude or flight level 140 .
  The full report is as follows: NEW VA EMS. to 14000 ft (4300 m)
  
  Sangay (Ecuador): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Washington warned about a volcanic ash plume that rose up to estimated 23000 ft (7000 m) altitude or flight level 230 .
  The full report is as follows: ONGOING VA EMS. to 23000 ft (7000 m)
  
  Reventador (Ecuador): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Washington warned about a volcanic ash plume that rose up to estimated 15000 ft (4600 m) altitude or flight level 150 and is moving at 15 kts in W direction.
  The full report is as follows: CONT VA EMS OBS to 15000 ft (4600 m)
  Satellite image of Klyuchevskoy volcano on 27 May 2025
  
  


• White Island volcano (New Zealand): eruptive activity declined
  May 27 2025 at 12:17 am EDT
  

  Over the past two weeks, webcam images have consistently shown a steam and gas plume emerging from the active vent. However, confirming the presence of ash has proven difficult. During this same period, our colleagues at MetService have not detected ash in the plume using satellite imagery. This suggests that if ash is still being emitted, it is occurring at a lower intensity than in previous weeks.
  Due to poor weather conditions, it was unable to carry out scheduled gas and observation flights, limiting ability to directly assess the state of the active vent or confirm any substantial ash emissions. Satellite data has not indicated any significant concentrations of ash in the atmosphere during this time, although small amounts of ash may go undetected. Sulphur dioxide (SO₂) gas emissions from the active vent at Whakaari/White Island continue at moderate levels.
  As soon as conditions permit, we plan to conduct observation and gas measurement flights. These will provide updated visual assessments of the vent’s morphology and activity, as well as measurements of gas flux and vent temperatures. In the meantime, satellite monitoring continues to track SO₂ emissions. The Te Kaha and Whakatāne webcams remain valuable sources for observing plume activity, although visibility can be affected by local weather conditions along the Bay of Plenty coast.
  Overall, steam and gas emissions appear steady, continuing the trend observed over recent months. The level of volcanic ash may be declining. However, in the absence of on-island monitoring, rapid changes in activity cannot be ruled out. Current observations are consistent with minor but possibly decreasing eruptive activity. The Volcanic Alert Level remains at 3 and the Aviation Colour Code at Orange.
  Source: Geonet New Zealand volcano activity update 27 May 2025

  
  


• Volcanic activity worldwide 26 May 2025: Santiaguito volcano, Semeru, Shiveluch, Ibu, Dukono, Marapi...
  May 26 2025 at 5:00 pm EDT
  
  Map of today's active volcanoes
  Shiveluch (Kamchatka): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Tokyo warned about a volcanic ash plume that rose up to estimated 12000 ft (3700 m) altitude or flight level 120 and is moving at 20 kts in NW direction.
  The full report is as follows: VA EMISSIONS CONTINUING OBS VA DTG:26/1720Z to 12000 ft (3700 m)
  
  Ibu (Halmahera, Indonesia): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Darwin warned about a volcanic ash plume that rose up to estimated 7000 ft (2100 m) altitude or flight level 070, and is moving at 10 kts in SW direction.
  The full report is as follows: VA TO FL070, LAST REPORTED AT 26/0834Z EST VA DTG:26/1020Z to 7000 ft (2100 m)
  
  Lewotolo (Lesser Sunda Islands): (26 May) Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Darwin warned about a volcanic ash plume that rose up to estimated 6000 ft (1800 m) altitude or flight level 060 and is moving at 10 kts in SW direction.
  The full report is as follows: VA TO FL060 REPORTED AT 26/0656Z EST VA DTG:26/0700Z to 6000 ft (1800 m)
  
  Semeru (East Java, Indonesia): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Darwin warned about a volcanic ash plume that rose up to estimated 15000 ft (4600 m) altitude or flight level 150, and is moving at 20 kts in SE direction.
  The full report is as follows: VA TO FL150, LAST REPORTED AT 26/1239Z EST VA DTG:26/1600Z to 15000 ft (4600 m)
  
  Marapi (Western Sumatra, Indonesia): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Darwin warned about a volcanic ash plume that rose up to estimated 12000 ft (3700 m) altitude or flight level 120 and is moving at 05 kts in W direction.
  The full report is as follows: VA TO FL120 EST VA DTG:26/0850Z to 12000 ft (3700 m)
  
  Dukono (Halmahera): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Darwin warned about a volcanic ash plume that rose up to estimated 8000 ft (2400 m) altitude or flight level 080 and is moving at 05 kts in SW direction.
  The full report is as follows: CONTINUOUS VA TO FL080 EXTD SW OBS VA DTG:26/1050Z to 8000 ft (2400 m)
  
  Kilauea (Hawai'i): The effusive activity within the Halemaʻumaʻu crater floor ceased at 10"25 PM tonight, marking the conclusion of the 23rd eruption.
  The activity in the northern vent was dominated by vigorous, tall lava fountains reaching 300 meters in height. In the southern vent, the fountaining activity generated glowing lava material (scoria and Pele's hair) up to 250 meters in height.
  Lava flows from this episode covered about half of the floor of Halemaʻumaʻu crater within the southern part of Kaluapele (Kīlauea caldera).
  ...26 May:
  Another, 23rd episode started within the Halemaʻumaʻu crater floor at about 04:15 PM local time yesterday and is ongoing at the of this update.
  The activity in the north vent increased from very low levels to strong, dome-shaped lava fountains by 04:50 PM. Columns of lava jets there have been surpassing 1,000 ft (300 meters).
  ... [read more] ... [show less]
  The south vent followed with smaller fountains at 05:15 PM local time, reaching a height of 230 ft (70 meters).
  North vent lava fountains are feeding fast moving lava flows that are covering the floor of Halema'uma'u crater.
  
  
  Santiaguito (Guatemala): Volcanic Ash Advisory Center Washington (VAAC) issued the following report: NO VA EMS
  
  Nevado del Ruiz (Colombia): (25 May) Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Washington warned about a volcanic ash plume that rose up to estimated 20000 ft (6100 m) altitude or flight level 200 .
  The full report is as follows: PSBL VA EMS to 20000 ft (6100 m)
  
  Sangay (Ecuador): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Washington warned about a volcanic ash plume that rose up to estimated 21000 ft (6400 m) altitude or flight level 210 .
  The full report is as follows: VA EMS CONT to 21000 ft (6400 m)
  
  Reventador (Ecuador): (25 May) Volcanic Ash Advisory Center Washington (VAAC) issued the following report: PSBL VA EMS
  Volcano Activity Summary for 26 May 2025: