Union City, CA Weather

Updated:  Sat, 05-Jul-2025 12:20pm EDT 
  clear Temperature: 67.6°F   /hr Humidity: 64%  Dew Point: 55.0 Wind: W  5.1 mph Gust: 7.0 mph Pressure: 30.067 inHg  Steady Rain Today: 0.00 in UV-index: 6.4   High 

Volcanic Activity Reports

Volcanoes – The Watchers

• The Weekly Volcanic Activity Report: June 25–July 1, 2025
  Jul 3 2025 at 12:42:05 UTC
  New activity/unrest was reported for two volcanoes from June 25 to July 1, 2025. During the same period, ongoing activity was reported for 20 volcanoes.

  Source

• Explosive eruption at Shinmoedake blankets parts of Miyazaki and Kagoshima prefectures with ash, Japan
  Jul 3 2025 at 08:07:57 UTC
  A strong explosive eruption occurred at Shinmoedake volcano, part of the Kirishima volcanic complex on Kyushu Island, Japan, at approximately 15:37 JST (06:37 UTC) on July 3, 2025, sending an ash plume up to 6.7 km (22 000 feet) above sea level (a.s.l.). The Japan Meteorological Agency (JMA) had raised the volcanic alert to Level 3 on June 27, following increased volcanic unrest.

  Source

• Ridge of Pennata islet collapses after the strongest earthquake in 40 years strikes Campi Flegrei, Italy
  Jun 30 2025 at 14:04:47 UTC
  An earthquake swarm with the strongest quake registered as an M4.6 quake struck the Campi Flegrei area in southern Italy on June 30, 2025, prompting evacuations and train delays in the region. It was the strongest tremor to strike the region in 40 years, surpassing the M4.4 quakes of March and May.

  Source

Worldwide Volcano News

• Ibu Volcano Volcanic Ash Advisory: VA LAST REPORTED AT 05/1350Z EST VA DTG: 05/1840Z
  Jul 5 2025 at 3:15 pm EDT
  
  Satellite image of Ibu volcano on 5 Jul 2025
  
  


• Volcanoes Today, 5 Jul 2025: Popocatépetl volcano, Semeru, Ibu, Dukono, Reventador, Raung, Sangay, Kirishima
  Jul 5 2025 at 3:00 pm EDT
  


• Kirishima Volcano Volcanic Ash Advisory: VA EMISSIONS CONTINUING OBS VA DTG: 05/1720Z to 8000 ft (2400 m)
  Jul 5 2025 at 2:15 pm EDT
  
  
  


• Reventador Volcano Volcanic Ash Advisory: OCSL VA EMS to 14000 ft (4300 m)
  Jul 5 2025 at 12:30 pm EDT
  
  
  


• Popocatépetl Volcano Volcanic Ash Advisory: CONS VA EMS to 21000 ft (6400 m)
  Jul 5 2025 at 11:15 am EDT
  
  
  


• Raung Volcano Volcanic Ash Advisory: VA TO FL120 REPORTED AT 05/1341Z EST VA DTG: 05/1420Z to 12000 ft (3700 m)
  Jul 5 2025 at 10:45 am EDT
  
  Satellite image of Raung volcano on 5 Jul 2025
  
  


• Dukono Volcano Volcanic Ash Advisory: VA LAST REPORTED AT 05/0601Z EST VA DTG: 05/1410Z
  Jul 5 2025 at 10:30 am EDT
  
  
  


• Semeru Volcano Volcanic Ash Advisory: VA ERUPTION LAST REPORTED AT 05/1114Z EST VA DTG: 05/1110Z
  Jul 5 2025 at 7:45 am EDT
  
  
  


• Kirishima Volcano Volcanic Ash Advisory: VA AT 20250705/1100Z 18NM S OF RJFK FL070 EXTD SE REPORTED
  Jul 5 2025 at 7:30 am EDT
  
  
  


• Lewotolo Volcano Volcanic Ash Advisory: VA LAST REPORTED AT 05/0413Z EST VA DTG: 05/1030Z
  Jul 5 2025 at 7:00 am EDT
  
  Satellite image of Lewotolo volcano on 5 Jul 2025
  
  


• Sangay Volcano Volcanic Ash Advisory: MULTIPLE VA CLDS OBSD. to 22000 ft (6700 m)
  Jul 5 2025 at 5:00 am EDT
  
  
  


• Ibu Volcano Volcanic Ash Advisory: VA TO FL070 LAST REPORTED AT 05/0407Z EST VA DTG: 05/0630Z to 7000 ft (2100 m)
  Jul 5 2025 at 3:30 am EDT
  
  
  


• Semeru Volcano Volcanic Ash Advisory: VA ERUPTION LAST REPORTED AT 05/0517Z EST VA DTG: 05/0517Z
  Jul 5 2025 at 1:30 am EDT
  
  Satellite image of Semeru volcano on 5 Jul 2025
  
  


• Popocatépetl Volcano Volcanic Ash Advisory: CONS VA EMS. to 20000 ft (6100 m)
  Jul 5 2025 at 12:45 am EDT
  
  
  


• Dukono Volcano Volcanic Ash Advisory: VA TO FL080 OBS AT 05/0200Z MOV SE EST VA DTG: 05/0200Z to 8000 ft (2400 m)
  Jul 4 2025 at 10:30 pm EDT
  
  
  


• Kirishima Volcano Volcanic Ash Advisory: ACTIVITY CONT. VA AT 20250705/0000Z FL060 EXTD SE OBS VA DTG: 04/2320Z to 17000 ft (5200 m)
  Jul 4 2025 at 8:30 pm EDT
  
  Satellite image of Kirishima volcano on 5 Jul 2025
  
  


• Lewotolo Volcano Volcanic Ash Advisory: VA ERUPTION LAST REPORTED AT 04/2225Z MOV SW
  Jul 4 2025 at 7:00 pm EDT
  
  
  


• Volcanic activity worldwide 4 Jul 2025: Popocatépetl volcano, Semeru, Shiveluch, Ibu, Dukono, Reven...
  Jul 4 2025 at 6:00 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 15000 ft (4600 m) altitude or flight level 150 and is moving at 5 kts in W direction.
  The full report is as follows: POSS ERUPTION OBS AT 20250704/1650Z FL150 EXTD W OBS VA DTG:04/1730Z to 15000 ft (4600 m)
  
  Kirishima (Kyushu): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Tokyo warned about a volcanic ash plume that rose up to estimated 17000 ft (5200 m) altitude or flight level 170 and is moving at 15 kts in SW direction.
  The full report is as follows: POSS VA EMISSIONS CONTINUING OBS VA DTG:04/1720Z to 17000 ft (5200 m)
  ...4 Jul:
  The explosive eruption at the volcano continues.
  According to the Japan Meteorological Agency (JMA), ash emissions have increased over the past two days and become near-continuous. An ash plume rose reached 22000 ft (6,700 m) altitude and drifted south yesterday.
  ... [read more] ... [show less]
  The eruption was accompanied by a significant rumbling that was heard in the surrounding foothills.
  Source: Japan Meteorological Agency volcano activity update July 2025
  
  
  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 SE direction.
  The full report is as follows: VA TO FL070 LAST REPORTED AT 04/1400Z EST VA DTG:04/1840Z to 7000 ft (2100 m)
  
  Lewotolo (Lesser Sunda Islands): Volcanic Ash Advisory Center Darwin (VAAC) issued the following report: VA ERUPTION LAST REPORTED AT 04/0504Z MOV W
  
  Semeru (East Java, Indonesia): Volcanic Ash Advisory Center Darwin (VAAC) issued the following report: VA ERUPTION LAST REPORTED AT 04/1641Z EST VA DTG:04/1710Z
  
  Dukono (Halmahera): (3 Jul) Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Darwin warned about a volcanic ash plume that rose up to estimated 9000 ft (2700 m) altitude or flight level 090 and is moving at 10 kts in SE direction.
  The full report is as follows: CONTINUOUS VA TO FL090 OBS AT 03/2140Z MOV SE to 9000 ft (2700 m)
  
  Popocatépetl (Central Mexico): 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: NEW VA EMS to 19000 ft (5800 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 OBS to 14000 ft (4300 m)
  Volcano Activity Summary for 4 Jul 2025:
  Satellite image of Shiveluch volcano on 4 Jul 2025
  
  


• Popocatépetl Volcano Volcanic Ash Advisory: NEW VA EMS to 19000 ft (5800 m)
  Jul 4 2025 at 5:45 pm EDT
  
  
  


• Kirishima volcano (Kyushu, Japan): ash emissions increased
  Jul 4 2025 at 2:01 am EDT
  
  Near-frequent ash emissions from Kirishima volcano (image: @WeatherMonitors/x.com)

  The explosive eruption at the volcano continues.
  According to the Japan Meteorological Agency (JMA), ash emissions have increased over the past two days and become near-continuous. An ash plume rose reached 22000 ft (6,700 m) altitude and drifted south yesterday.
  The eruption was accompanied by a significant rumbling that was heard in the surrounding foothills.
  Source: Japan Meteorological Agency volcano activity update July 2025
  
  

  This afternoon: A powerful eruption occurred at Mount Kirishima’s Shinmoedake crater at 1:49 PM (local time).Volcanic smoke rose an estimated 5,000 meters into the sky. Ongoing activity continues to be closely monitored.( July 03, 2025) Shinmoedake, Kyushu, Japan pic.twitter.com/B1SjPXNmIV

  — Weather Monitor (@WeatherMonitors) July 3, 2025
  


• Volcanic activity worldwide 3 Jul 2025: Santiaguito volcano, Popocatépetl, Semeru, Shiveluch, Ibu, ...
  Jul 3 2025 at 5:00 pm EDT
  
  Map of today's active volcanoes
  Shiveluch (Kamchatka): Volcanic Ash Advisory Center Tokyo (VAAC) issued the following report: VA IS NOT IDENTIFIABLE IN SATELLITE IMAGERY.
  
  Kirishima (Kyushu): Explosive activity continues. Volcanic Ash Advisory Center (VAAC) Tokyo warned about a volcanic ash plume that rose up to estimated 11000 ft (3400 m) altitude or flight level 110 and is moving at 15 kts in S direction.
  The full report is as follows: ERUPTIVE ACTIVITY CONTINUING OBS VA DTG:03/1720Z to 11000 ft (3400 m)
  ...3 Jul:
  The Japan Meteorological Agency (JMA) reported that no further eruptive events were detected since the last strong explosion on 22 June.
  Only steam-gas-laden plumes with minor amounts of ash has been continuing over the past few days from the crater. The plume rose more than 400 meters above the summit.
  ... [read more] ... [show less]
  Source: Japan Meteorological Agency volcano activity update 3 July 2025
  
  
  Raung (East Java): 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 10 kts in SW direction.
  The full report is as follows: VA TO FL120 REPORTED AT 03/1923Z EST VA DTG:03/1930Z to 12000 ft (3700 m)
  
  Ibu (Halmahera, Indonesia): Volcanic Ash Advisory Center Darwin (VAAC) issued the following report: VA ERUPTION REPORTED AT 03/1246Z MOV SE EST VA DTG:03/1250Z
  
  Semeru (East Java, Indonesia): Volcanic Ash Advisory Center Darwin (VAAC) issued the following report: VA ERUPTION LAST REPORTED AT 03/1517Z EST VA DTG:03/1720Z
  
  Dukono (Halmahera): 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 E direction.
  The full report is as follows: VA TO FL070 LAST REPORTED AT 03/0839Z MOV E to 7000 ft (2100 m)
  
  Popocatépetl (Central Mexico): 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 EMS OBS to 20000 ft (6100 m)
  
  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)
  
  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: LKLY CONT VA EM to 14000 ft (4300 m)
  Satellite image of Shiveluch volcano on 3 Jul 2025
  
  


• Kirishima volcano (Kyushu, Japan): degassing and small ash emissions continue
  Jul 3 2025 at 2:43 am EDT
  
  Steaming and small ash emissions from Kirishima volcano on 2 July (image: @WeatherMonitors/x.com)

  The Japan Meteorological Agency (JMA) reported that no further eruptive events were detected since the last strong explosion on 22 June.
  Only steam-gas-laden plumes with minor amounts of ash has been continuing over the past few days from the crater. The plume rose more than 400 meters above the summit.
  Source: Japan Meteorological Agency volcano activity update 3 July 2025
  
  

  AVISO Pulso eruptivo del Volcán Shinmoedake, en el sureste de la isla de Kyūshū, Japón ???????? La erupción, hoy 2 de julio, lanzó una columna de gases y cenizas a 2,800 metros por encima del cráter.Se mantiene el nivel de alerta 3, se reporta caída de ceniza hacia el oeste, en… pic.twitter.com/O4xIbDmfaU

  — Geól. Sergio Almazán (@chematierra) July 2, 2025
  


• Volcanic activity worldwide 2 Jul 2025: Fuego volcano, Semeru, Ibu, Dukono, Reventador, Raung, Kiris...
  Jul 2 2025 at 5:00 pm EDT
  
  Map of today's active volcanoes
  Kirishima (Kyushu): 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 10 kts in SW direction.
  The full report is as follows: VA EMISSIONS CONTINUING OBS VA DTG:02/1120Z to 14000 ft (4300 m)
  
  Raung (East Java): (2 Jul) Volcanic Ash Advisory Center Darwin (VAAC) issued the following report: VA REPORTED TO FL130 AT 01/1916Z EST VA DTG:02/0229Z
  
  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 E direction.
  The full report is as follows: VA TO FL070 LAST REPORTED AT 02/1204Z EST VA DTG:02/1330Z to 7000 ft (2100 m)
  
  Lewotolo (Lesser Sunda Islands): Volcanic Ash Advisory Center Darwin (VAAC) issued the following report: VA LAST REPORTED AT 02/1035Z EST VA DTG:02/1650Z
  
  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 05 kts in NW direction.
  The full report is as follows: VA TO FL150 LAST REPORTED AT 02/0337Z EST VA DTG:02/1130Z to 15000 ft (4600 m)
  
  Dukono (Halmahera): Volcanic Ash Advisory Center Darwin (VAAC) issued the following report: VA LAST REPORTED AT 01/2213Z EST VA DTG:02/0940Z
  
  Fuego (Guatemala): Volcanic Ash Advisory Center Washington (VAAC) issued the following report: PSBL VA EMS
  
  Reventador (Ecuador): Volcanic Ash Advisory Center Washington (VAAC) issued the following report: PSBL VA EMS
  Volcano Activity Summary for 2 Jul 2025:
  
  


• Kilauea volcano (United States) - Smithsonian / USGS Weekly Volcanic Activity Report for 25 June-1 July 2025 (Continuing Activity)
  Jul 2 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 and intermittent spatter at two vents along the SW margin of Halema’uma’u Crater, continued at variable levels during 25 June-1 July. Nighttime incandescence at both the N and S vents was visible overnight during 24-28 June and intermittent lava spattering at the N vent was visible during 26-29 June. Small, sporadic dome fountains and intermittent lava overflows at the N vent began at 0727 on 29 June.
  Small, sustained lava fountaining began at 0803 and the fountains slowly grew over the next hour; at 0905 the height and vigor of the fountains increased notably. The fountains were as high as 150 m by 0931 and multiple lava flows were advancing on the crater floor. An eruption plume rose at least 6 km (20,000 ft) above the ground; variable winds blew gas and tephra plumes in different directions.
  The fountains rose higher, reaching 340 m for several hours. The activity started to wane and ceased at 1954, after 11 hours of continuous fountaining. Flames were visible at the S vent for a few minutes afterwards.
  The N vent produced an estimated 6.2 million cubic meters of lava covering about 80 percent of the crater floor. 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 25 June-1 July 2025. Smithsonian Institution and US Geological Survey.

  
  


• Iliamna volcano (United States) - Smithsonian / USGS Weekly Volcanic Activity Report for 25 June-1 July 2025 (Continuing Activity)
  Jul 2 2025 at 10:00 am EDT
  

  The Alaska Volcano Observatory (AVO) reported that repairs to Iliamna’s seismic network were completed during the previous week, allowing for sufficient data to be available to monitor activity. At 1141 on 1 July the Aviation Color Code was changed from Unassigned to Green (the lowest level on a four-color scale) and the Volcano Alert Level was changed from Unassigned to Normal (the lowest level on a four-level scale).
  
  Source: US Geological Survey Alaska Volcano Observatory (AVO)
  ---
  From: Global Volcanism Program, 2025. Report on Iliamna (United States). In: Mayberry, G (ed.), Weekly Volcanic Activity Report 25 June-1 July 2025. Smithsonian Institution and US Geological Survey.

  
  


• Lewotolok volcano (Indonesia) - Smithsonian / USGS Weekly Volcanic Activity Report for 25 June-1 July 2025 (Continuing Activity)
  Jul 2 2025 at 10:00 am EDT
  

  The Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG) reported that an eruption at Lewotolok was ongoing during 25 June-1 July. Daily gray, white-to-gray, or gray-to-black ash plumes rose 400-1,200 m above the summit of the cone and drifted in multiple directions. Clear nighttime webcam images showed incandescent material both at the summit cone and being ejected above the cone.
  Lava flows on the flanks of the main volcano edifice were also incandescent. 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)
  ---
  From: Global Volcanism Program, 2025. Report on Lewotolok (Indonesia). In: Mayberry, G (ed.), Weekly Volcanic Activity Report 25 June-1 July 2025. Smithsonian Institution and US Geological Survey.

  
  


• Great Sitkin volcano (United States) - Smithsonian / USGS Weekly Volcanic Activity Report for 25 June-1 July 2025 (Continuing Activity)
  Jul 2 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 25 June-1 July. Small daily earthquakes were detected by the seismic network, including signals probably caused by small rockfalls from the steep S and SE flanks. Slightly elevated surface temperatures consistent with lava effusion were occasionally observed in clear satellite views.
  Observers on a nearby ship saw a diffuse steam plume rising above the dome during 27-38 June. 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 25 June-1 July 2025. Smithsonian Institution and US Geological Survey.

  
  


• Fuego volcano (Guatemala) - Smithsonian / USGS Weekly Volcanic Activity Report for 25 June-1 July 2025 (Continuing Activity)
  Jul 2 2025 at 10:00 am EDT
  

  The Instituto Nacional de Sismología, Vulcanologia, Meteorologia e Hidrología (INSIVUMEH) reported that explosions were last detected at Fuego on 22 June. Incandescence at the summit was observed in webcam images during 24 June-1 July. Fumarolic plumes occasionally rose from the summit.
  
  Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)
  ---
  From: Global Volcanism Program, 2025. Report on Fuego (Guatemala). In: Mayberry, G (ed.), Weekly Volcanic Activity Report 25 June-1 July 2025. Smithsonian Institution and US Geological Survey.

  
  


• Gaua volcano (Vanuatu) - Smithsonian / USGS Weekly Volcanic Activity Report for 25 June-1 July 2025 (Continuing Activity)
  Jul 2 2025 at 10:00 am EDT
  

  On 27 June the Vanuatu Meteorology and Geohazards (VMGD) reported that unrest continued at Gaua during the month. Steam and/or gas emissions from the vent were visible in satellite images during 9-10 and 17 June and sulfur dioxide emissions were identified during 10-11 June. The Alert Level remained at 2 (on a scale of 0-5) and the public was warned to stay away from the main cone.
  
  Source: Vanuatu Meteorology and Geohazards Department (VMGD)
  ---
  From: Global Volcanism Program, 2025. Report on Gaua (Vanuatu). In: Mayberry, G (ed.), Weekly Volcanic Activity Report 25 June-1 July 2025. Smithsonian Institution and US Geological Survey.

  
  


• Lopevi volcano (Vanuatu) - Smithsonian / USGS Weekly Volcanic Activity Report for 25 June-1 July 2025 (Continuing Activity)
  Jul 2 2025 at 10:00 am EDT
  

  On 27 June the Vanuatu Meteorology and Geohazards Department (VMGD) reported that seismic data confirmed continuing unrest at Lopevi throughout June. Small fumarolic steam plumes were continuously emitted from the summit crater during 6 and 10-11 June based on a webcam images. Low-level thermal anomalies were identified in satellite images on 2 June, indicative of increased surface temperatures, and sulfur dioxide emissions were detected on 10 June.
  The Alert Level remained at 2 (on a scale of 0-4).
  
  Source: Vanuatu Meteorology and Geohazards Department (VMGD)
  ---
  From: Global Volcanism Program, 2025. Report on Lopevi (Vanuatu). In: Mayberry, G (ed.), Weekly Volcanic Activity Report 25 June-1 July 2025. Smithsonian Institution and US Geological Survey.

  
  


• Ibu volcano (Indonesia) - Smithsonian / USGS Weekly Volcanic Activity Report for 25 June-1 July 2025 (Continuing Activity)
  Jul 2 2025 at 10:00 am EDT
  

  The Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG) reported that the eruption at Ibu continued during 25 June-1 July. Daily dense gray ash plumes rose 200-600 m above the summit and drifted NE, E, and SE. Nighttime crater incandescence was visible in some webcam images.
  The Alert Level remained at 3 (the second highest level on a four-level scale) and the public was advised to stay 4 km away from the active crater and 5 km away from the N crater wall opening.
  
  Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
  ---
  From: Global Volcanism Program, 2025. Report on Ibu (Indonesia). In: Mayberry, G (ed.), Weekly Volcanic Activity Report 25 June-1 July 2025. Smithsonian Institution and US Geological Survey.

  
  


• Rincon de la Vieja volcano (Costa Rica) - Smithsonian / USGS Weekly Volcanic Activity Report for 25 June-1 July 2025 (Continuing Activity)
  Jul 2 2025 at 10:00 am EDT
  

  The Observatorio Vulcanologico y Sismologico de Costa Rica-Universidad Nacional (OVSICORI-UNA) reported that at 1720 on 26 June a small phreatic eruption at Rincón de la Vieja produced a gas plume that rose 100 m above the crater rim and drifted NW.
  
  Source: Observatorio Vulcanologico y Sismologico de Costa Rica-Universidad Nacional (OVSICORI-UNA)
  ---
  From: Global Volcanism Program, 2025. Report on Rincon de la Vieja (Costa Rica). In: Mayberry, G (ed.), Weekly Volcanic Activity Report 25 June-1 July 2025. Smithsonian Institution and US Geological Survey.

  
  


• Stromboli volcano (Italy) - Smithsonian / USGS Weekly Volcanic Activity Report for 25 June-1 July 2025 (Continuing Activity)
  Jul 2 2025 at 10:00 am EDT
  

  The Sezione di Catania - Osservatorio Etneo (INGV) reported that eruptive activity continued at Stromboli during 23-29 June. Webcam images showed Strombolian activity at four vents in Area N within the upper part of the Sciara del Fuoco and from at least two vents in Area C-S (South-Central Crater) on the crater terrace. The vents in Area N continued to produce low- to medium-intensity explosions at a rate of 7-11 events per hour, ejecting lapilli and bombs less than 150 m above the vents.
  Low-intensity explosions at the vents in Area C-S ejected ash above the vent at a rate of 0-1 events per hour. The Alert Level remained at Yellow (the second lowest level on a four-level scale) according to the Dipartimento della Protezione Civile.
  
  Sources: Sezione di Catania - Osservatorio Etneo (INGV), Dipartimento della Protezione Civile
  ---
  From: Global Volcanism Program, 2025. Report on Stromboli (Italy). In: Mayberry, G (ed.), Weekly Volcanic Activity Report 25 June-1 July 2025. Smithsonian Institution and US Geological Survey.

  
  


• Suwanosejima volcano (Japan) - Smithsonian / USGS Weekly Volcanic Activity Report for 25 June-1 July 2025 (Continuing Activity)
  Jul 2 2025 at 10:00 am EDT
  

  The Japan Meteorological Agency (JMA) reported that eruptive activity at Suwanosejima's Ontake Crater continued during 23-30 June. Incandescence was observed nightly in webcam images. Explosions at 1041 on 23 June, at 1939 on 27 June, and at 0806 on 30 June produced ash plumes that rose 2.3, 0.6, and 1.7 km above the crater rim and drifted NE, E, and straight up, respectively.
  Eruptive events during 27 and 29-30 June produced ash plumes that rose as high as 2.1 km above the crater rim and mainly rose straight up or drifted W. The Alert Level remained at 2 (the second level on a five-level scale) and the public was warned to be cautious within 1.5 km of the crater.
  
  Source: Japan Meteorological Agency (JMA)
  ---
  From: Global Volcanism Program, 2025. Report on Suwanosejima (Japan). In: Mayberry, G (ed.), Weekly Volcanic Activity Report 25 June-1 July 2025. Smithsonian Institution and US Geological Survey.

  
  


• Yasur volcano (Vanuatu) - Smithsonian / USGS Weekly Volcanic Activity Report for 25 June-1 July 2025 (Continuing Activity)
  Jul 2 2025 at 10:00 am EDT
  

  On 27 June the Vanuatu Meteorology and Geohazards Department (VMGD) reported that activity at Yasur had continued during the month at a level of “major unrest,” as defined by the Alert Level 2 status (on a scale of 0-5). Field photos and webcam images indicated that explosions continued, producing emissions of gas, steam, and/or ash. Sulfur dioxide gas emissions were identified in satellite images during 4-12, 15-16, 20-22, and 26 June, and low-level thermal anomalies were identified during 5, 19-20, and 24 June.
  Seismic data confirmed continuing volcanic activity with explosions that were occasionally strong. The report warned that ejected material from explosions could fall in and around the crater. The public was reminded to not enter the restricted area within 600 m around the boundaries of the Permanent Exclusion Zone, defined by Danger Zone A on the hazard map.
  
  Source: Vanuatu Meteorology and Geohazards Department (VMGD)
  ---
  From: Global Volcanism Program, 2025. Report on Yasur (Vanuatu). In: Mayberry, G (ed.), Weekly Volcanic Activity Report 25 June-1 July 2025. Smithsonian Institution and US Geological Survey.

  
  


• Sheveluch volcano (Russia) - Smithsonian / USGS Weekly Volcanic Activity Report for 25 June-1 July 2025 (Continuing Activity)
  Jul 2 2025 at 10:00 am EDT
  

  The Far Eastern Branch of the Russian Academy of Sciences (FEB RAS) reported that eruptive activity at Sheveluch continued during 20-26 June. Weather clouds mostly obscured views through the week, though a few ash plumes were visible in webcam or satellite views on 23 and 25 June rising as high as 4.5 km a.s.l. and drifting E and SE.
  
  Source: 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 25 June-1 July 2025. Smithsonian Institution and US Geological Survey.

  
  


• Semeru volcano (Indonesia) - Smithsonian / USGS Weekly Volcanic Activity Report for 25 June-1 July 2025 (Continuing Activity)
  Jul 2 2025 at 10:00 am EDT
  

  The Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG) reported that activity continued at Semeru during 25 June-1 July, often with multiple daily eruptive events recorded by the seismic network. Emissions were not visually observed most of the week. At 0025 and 0030 on 1 July white-and-gray ash plumes rose 500-600 m above the summit and drifted SW.
  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)
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  From: Global Volcanism Program, 2025. Report on Semeru (Indonesia). In: Mayberry, G (ed.), Weekly Volcanic Activity Report 25 June-1 July 2025. Smithsonian Institution and US Geological Survey.

  
  


• Raung volcano (Indonesia) - Smithsonian / USGS Weekly Volcanic Activity Report for 25 June-1 July 2025 (Continuing Activity)
  Jul 2 2025 at 10:00 am EDT
  

  The Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG) reported that eruptive activity at Raung continued during 25 June-1 July. No emissions were visible during 25-28 June, likely due to weather conditions. Daily ash plumes during 29 June-1 July rose as high has as 600 m above the crater rim and drifted NW and W.
  Incandescence at the summit was sometimes visible in webcam images. The Alert Level remained at 2 (on a scale of 1-4) and the public was warned to stay 3 km away from the summit crater.
  
  Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
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  From: Global Volcanism Program, 2025. Report on Raung (Indonesia). In: Mayberry, G (ed.), Weekly Volcanic Activity Report 25 June-1 July 2025. Smithsonian Institution and US Geological Survey.

  
  


• Santa Maria volcano (Guatemala) - Smithsonian / USGS Weekly Volcanic Activity Report for 25 June-1 July 2025 (Continuing Activity)
  Jul 2 2025 at 10:00 am EDT
  

  The Instituto Nacional de Sismología, Vulcanología, Meteorología e Hidrología (INSIVUMEH) reported high levels of ongoing eruptive activity at Santa Maria’s Santiaguito dome complex during 24 June-1 July with continuing lava extrusion at Caliente dome. Daily explosions, 1-2 per hour when reported, generated gas-and-ash plumes that rose as high as 1.2 km above the dome and drifted as far as 30 km N, NW, W, and SW. Effusion of blocky lava and collapses of material produced block avalanches that descended multiple flanks; the collapsed material sometimes produced short pyroclastic flows that reached the base of Caliente cone.
  Incandescence was visible at Caliente dome and upper part of the W flank lava flow. Minor ashfall was reported in communities surrounding the volcano during 25-26 June and in San Marcos (10 km SW), Loma Linda (7 km W), Palajunoj (17 km SSW), and other areas downwind during 29-30 June.
  
  Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)
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  From: Global Volcanism Program, 2025. Report on Santa Maria (Guatemala). In: Mayberry, G (ed.), Weekly Volcanic Activity Report 25 June-1 July 2025. Smithsonian Institution and US Geological Survey.

  
  


• Poas volcano (Costa Rica) - Smithsonian / USGS Weekly Volcanic Activity Report for 25 June-1 July 2025 (Continuing Activity)
  Jul 2 2025 at 10:00 am EDT
  

  The Observatorio Vulcanológico y Sismológico de Costa Rica-Universidad Nacional (OVSICORI-UNA) reported continuing gas-and-steam emissions with occasional minor amounts of ash at Poás during 24 June-1 July. Uplift ceased to be detected in the past few weeks and no significant deformation was detected during the current week. Incandescence was periodically visible and detected in infrared webcam views at Boca A vent.
  The hyperacid lake over Boca C continued to rise, notably during periods of heavy rain. Dense gas-and-steam emissions continued to be emitted from Boca A; gas component ratios were at normal levels. The emissions contained minor ash content at around 1530 on 25 June and rose 500 m above the crater rim.
  The Alert Level remained at 2 (the second lowest level on a four-level scale) and the Aviation Color Code remained at Yellow (the second lowest color on a four-color 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 25 June-1 July 2025. Smithsonian Institution and US Geological Survey.