Smithsonian / USGS Weekly Volcanic Activity Report

The Weekly Volcanic Activity Report is a cooperative project between the Smithsonian's Global Volcanism Program and the US Geological Survey's Volcano Hazards Program. Updated by 2300 UTC every Wednesday and averaging 16 reported volcanoes, this is not a comprehensive list of all eruptions this week, but rather a summary of activity that meet criteria discussed in the "Criteria and Disclaimers" section below.

Volcanic activity reported here is preliminary and subject to change. Carefully reviewed, detailed narratives over longer time periods are published as reports of the Bulletin of the Global Volcanism Network available through volcano profile pages.

Smithsonian / USGS Weekly Volcanic Activity Report for the week of 30 April-6 May 2025
Name	Country	Volcanic Region	Eruption Start Date	Report Status
Bezymianny	Russia	Eastern Kamchatka Volcanic Arc	2024 Dec 24	New
Bulusan	Philippines	Eastern Philippine Volcanic Arc	2025 Apr 28	New
Home Reef	Tonga	Tofua Volcanic Arc	2024 Dec 4	New
Klyuchevskoy	Russia	Eastern Kamchatka Volcanic Arc	2025 Apr 8	New
Northern EPR at 9.8°N	Undersea Features	Northern East Pacific Rise Volcanic Province	—	New
Poas	Costa Rica	Central America Volcanic Arc	2025 Jan 5	New
Ahyi	United States	Mariana Volcanic Arc	2024 Aug 5	Continuing
Aira	Japan	Ryukyu Volcanic Arc	2017 Mar 25	Continuing
Atka Volcanic Complex	United States	Aleutian Ridge Volcanic Arc	2025 Feb 20	Continuing
Dukono	Indonesia	Halmahera Volcanic Arc	1933 Aug 13	Continuing
Etna	Italy	Sicily Volcanic Province	2022 Nov 27	Continuing
Great Sitkin	United States	Aleutian Ridge Volcanic Arc	2021 May 25	Continuing
Ibu	Indonesia	Halmahera Volcanic Arc	2008 Apr 5	Continuing
Kanlaon	Philippines	Negros-Sulu Volcanic Arc	2024 Oct 19	Continuing
Karymsky	Russia	Eastern Kamchatka Volcanic Arc	2025 Apr 30	Continuing
Kilauea	United States	Hawaiian-Emperor Hotspot Volcano Group	2024 Dec 23	Continuing
Lewotobi	Indonesia	Sunda Volcanic Arc	2023 Dec 23	Continuing
Lewotolok	Indonesia	Sunda Volcanic Arc	2025 Jan 16	Continuing
Marapi	Indonesia	Sunda Volcanic Arc	2023 Dec 3	Continuing
Merapi	Indonesia	Sunda Volcanic Arc	2020 Dec 31	Continuing
Nyamulagira	DR Congo	Albertine Rift Volcanic Province	2018 Apr 14	Continuing
Popocatepetl	Mexico	Trans-Mexican Volcanic Arc	2005 Jan 9	Continuing
Reventador	Ecuador	Northern Andean Volcanic Arc	2008 Jul 27	Continuing
Semeru	Indonesia	Sunda Volcanic Arc	2017 Jun 6	Continuing
Sheveluch	Russia	Eastern Kamchatka Volcanic Arc	1999 Aug 15	Continuing
Suwanosejima	Japan	Ryukyu Volcanic Arc	2004 Oct 23	Continuing

All times are local unless otherwise stated.

Bezymianny (Russia) | 30 April-6 May 2025 | New Activity / Unrest Cite this Report

Bezymianny
Eastern Kamchatka Volcanic Arc

The Kamchatkan Volcanic Eruption Response Team (KVERT) reported that an explosive eruption at Bezymianny on 23 April produced ash plumes that rose 11 km (36,100 ft) a.s.l. and pyroclastic flows that descended the Vostochnaya (E) and Yuzhnaya (S) drainages. The ash cloud drifted SW and then SE as far as 900 km during 23-25 April. Following the explosions the dome continued to erupt viscous lava and small, hot avalanches of material descended the flanks. A bright thermal anomaly was visible in satellite images through 1 May. The Aviation Color Code was lowered to Yellow (the second lowest level on a four-color scale) on 29 April.

Source: Kamchatkan Volcanic Eruption Response Team (KVERT)

Bulusan (Philippines) | 30 April-6 May 2025 | New Activity / Unrest Cite this Report

Bulusan
Eastern Philippine Volcanic Arc

The Philippine Institute of Volcanology and Seismology (PHIVOLCS) reported continuing unrest at Bulusan during 30 April-5 May. The seismic network recorded 50-127 daily volcanic earthquakes, including 2-52 periods of volcanic tremor during 30 April-3 May that each lasted 1-58 minutes. Gas-and-steam emissions of variable densities rose as high has 500 m above the summit and drifted E, WNW, W, and WSW; views were obscured on 2 May. Daily averages of sulfur dioxide emissions ranged from 809 to 2,131 tonnes per day. The Alert Level remained at 1 (the second lowest level on a scale of 0-5). The public was reminded not to enter the 4-km-radius Permanent Danger Zone (PDZ) and to be vigilant within the 2-km Extended Danger Zone (EDZ) on the SE flank.

Source: Philippine Institute of Volcanology and Seismology (PHIVOLCS)

Home Reef (Tonga) | 30 April-6 May 2025 | New Activity / Unrest Cite this Report

Home Reef
Tofua Volcanic Arc

The Tonga Geological Services reported continuing activity at Home Reef with lava effusion and explosive activity at the main vent. A cone had grown around the vent and was 50-100 m high, based on a 26 April satellite image, and the vent had enlarged to about 175 m by 135 m in dimension. New deposits of material were visible on the W and SW flanks, nearly covering the lava lobes emplaced in November and December 2024. A volcanic ash plume was identified in a satellite image at 1354 on 29 April. In a 1 May image steam plumes rose from the vent and water around the island was discolored. Moderate thermal anomalies continued to be detected by the Middle InfraRed Observation of Volcanic Activity (MIROVA) system at least through 3 May. The island was about 540 m N-S and 440 m W-E. According to the Wellington VAAC intermittent, low-level ash plumes were visible in satellite images and sometimes observed by pilots during 29-30 April and on 3 May rising 0.9-1.2 km (3,000-4,000 ft) a.s.l. and drifting N, NW, W, and SW. The Aviation Color Code remained at Orange (the second highest level on a four-level scale), the Maritime Alert Level remained at Orange (the third level on a four-level scale), and mariners were advised to stay at least 2 nautical miles (3.7 km) away from the island. The Alert Level for residents of Vava’u and Ha’apai remained at Green (the first level on a four-level scale).

Sources: Tonga Geological Services, Government of Tonga, Wellington Volcanic Ash Advisory Center (VAAC)

Klyuchevskoy (Russia) | 30 April-6 May 2025 | New Activity / Unrest Cite this Report

Klyuchevskoy
Eastern Kamchatka Volcanic Arc

The Kamchatkan Volcanic Eruption Response Team (KVERT) reported that a thermal anomaly at Klyuchevskoy was identified in satellite images during 24 April-1 May. Lava fountaining occurred deep within the summit crater and incandescence was occasionally visible above the crater rim. The Aviation Color Code remained at Yellow (the second lowest level on a four-color scale). Dates are based on UTC times; specific events are in local time where noted.

Source: Kamchatkan Volcanic Eruption Response Team (KVERT)

Northern EPR at 9.8°N (Undersea Features) | 30 April-6 May 2025 | New Activity / Unrest Cite this Report

Northern EPR at 9.8°N
Northern East Pacific Rise Volcanic Province

In a 2 May press release the Woods Hole Oceanographic Institution reported that scientists from multiple institutions and universities took part in an expedition to the Northern East Pacific Rise (EPR) at 9.8°N, an area about 1,300 miles west of Costa Rica, and observed a seafloor eruption. On 28 April a team of scientists aboard the Alvin submersible observed a vibrant ecosystem at the Tica hydrothermal vents, ~2,500 m below the surface, including tubeworms, mussels, crabs, fish, and many other animals. During another dive the next day they noted particulate matter in the water column and slightly elevated temperatures. They turned on the lights and saw that Tica was barren, with dead stands of tubeworms covered in fresh basalt and flashes of incandescence indicating ongoing eruptive activity. The dive was aborted, and planned future dives during the length of the expedition were cancelled due to the safety concerns surrounding the eruption. Scientists continued to gather data at Tica by lowering instrumentation into the water until the end of the expedition on 3 May. Precursory activity including rising temperatures and changes in water chemistry at the vents recorded by previously installed instrumentation.

Source: Woods Hole Oceanographic Institution

Poas (Costa Rica) | 30 April-6 May 2025 | New Activity / Unrest Cite this Report

Poas
Central America Volcanic Arc

The Observatorio Vulcanológico y Sismológico de Costa Rica-Universidad Nacional (OVSICORI-UNA) reported continuous gas-and-steam emissions, ash-and-gas emissions sometimes lasting hours, and explosions at Poás during 30 April-6 May. Inflation continued to be detected. Seismic and infrasound sensors recorded seismic-acoustic signals indicating fluctuating eruptive activity with frequent more intense eruptive pulses. The webcams recorded the emissions and incandescence at the vents.

During 29-30 April ash-and-gas plumes rose a few hundred meters above the crater rim and drifted SW, causing significant ashfall in the Sarchi area (18 km SW). The density of the ash content was higher in the morning and early afternoon on 30 April. Around 0300 on 1 May a team conducted a drone overflight and measured a temperature of 180 degrees Celsius, indicating no lava near the surface. A more intense eruptive pulse at 0315 sent ash-and-gas 500 m above the crater rim. Burning molten sulfur at the vents was visible at night during 1-2 May and continued to be visible during dark hours the rest of the week. Beginning at 0500 on 2 May ash emissions were continuous for at least three hours, producing a black-and-white plume that rose less than 1 km above the crater rim and drifted W. Several eruptive pulses with white-and-gray plumes were recorded during the day, notably at 1520, and drifted W. Ashfall was reported in Grecia and Naranjo, and residents observed rising ash-laden water levels in the Desague (W) and Anonos (N) rivers. Incandescent material was ejected mainly to the W and deposited on the crater floor. Sulfur dioxide emissions averaged 612 tons per day (t/d). Ashfall was reported in San Juan de Grecia (17 km SW), Montes de Oca (37 km SE), and San José (34 km SE), and a sulfur odor was detected in Alajuela (San Ramón, 29 km WSW).

Overnight during 2-3 May incandescence from sulfur combustion suggested temperatures around 160 degrees Celsius. Eruptive pulses at 0300 and 0812 on 3 May generated ash-and-gas plumes that rose 500 m above the crater rim and drifted W. Sulfur dioxide emissions detected in satellite data were 508 t/d. Eruptive activity decreased during 3-4 May, characterized by vigorous white gas-and-steam plumes with less ash content. Sulfur combustion produced intense incandescence overnight. The ash content in the emissions increased at around 1100 and caused a darker plume that drifted W. An ash-and-gas plume from an eruptive pulse at 2030 rose 600 m above the crater rim and drifted W. At 2059 incandescent ballistics were ejected from Boca A and deposited onto the crater floor. Sulfur dioxide emissions measured by a Differential Optical Absorption Spectroscopy (DOAS) station on 5 May averaged 3,190 t/d (+/- 560 t/d), slightly lower than the same measurement made in April but higher compared to historical data. Steam-and-gas emissions continued on 6 May, though they were semi-continuous, less robust, and contained low or no ash content; plumes drifted SW. The volcano’s Alert Level remained at 3 (the second highest level on a four-level scale) and the Aviation Color Code remained at Orange (the second highest color on a four-color scale).

Source: Observatorio Vulcanologico y Sismologico de Costa Rica-Universidad Nacional (OVSICORI-UNA)

Ahyi (United States) | 30 April-6 May 2025 | Continuing ActivityCite this Report

Ahyi
Mariana Volcanic Arc

Unrest at Ahyi Seamount continued during 25 April-1 May. Discolored water in the vicinity of the seamount was last identified in a satellite image on 25 April, indicating possible submarine activity. Signals coming from the direction of Ahyi were identified in data from underwater pressure sensors near Wake Island (about 2,270 km E) during 28 April-1 May. 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

Aira (Japan) | 30 April-6 May 2025 | Continuing ActivityCite this Report

Aira
Ryukyu Volcanic Arc

The Japan Meteorological Agency (JMA) reported ongoing eruptive activity at Minamidake Crater (Aira Caldera’s Sakurajima volcano) during 28 April-5 May. Nightly crater incandescence was visible at Minamidake Crater in webcam images, and very small eruptive events were recorded during 2-5 May. An eruptive event at 2336 on 29 April generated an ash plume that rose 1.1 km above the crater rim and drifted S. On 2 May sulfur dioxide emissions averaged 900 tons per day, the same as the previous measurement on 17 April. 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)

Atka Volcanic Complex (United States) | 30 April-6 May 2025 | Continuing ActivityCite this Report

Atka Volcanic Complex
Aleutian Ridge Volcanic Arc

At 1200 on 5 May the Alaska Volcano Observatory (AVO) lowered the Volcano Alert Level for the Atka volcanic complex to Normal (the lowest level on a four-level scale) and the Aviation Color Code to Green (the lowest color on a four-color scale). AVO noted that no additional explosive activity was recorded after the small explosive event at 1034 on 25 April.

Source: US Geological Survey Alaska Volcano Observatory (AVO)

Dukono (Indonesia) | 30 April-6 May 2025 | Continuing ActivityCite this Report

Dukono
Halmahera Volcanic Arc

The Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG) reported that eruptive activity at Dukono continued at high levels through 6 May. Daily eruptive events in 2025 were in the 60-394 range, with an average of 227 per day. Gas-and-ash plumes generally rose 200-2,500 m above the summit, though during 27 March-30 April plumes rose as high as 1,400 m above the summit. The plumes drifted E, NW, and W towards populated areas. On 30 April occasional rumbling was followed by a strong boom felt by residents as far as 11 km away. During 1-6 May white-and-gray ash plumes rose 100-1,500 m above the crater rim and drifted in variable directions. Minor ashfall was reported in Mamuya, 11 km N, on 1 May and rumbling was heard during 1-2 May. The Alert Level remained at Level 2 (on a scale of 1-4) and the public was warned to stay 4 km away from the Malupang Warirang Crater.

Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)

Etna (Italy) | 30 April-6 May 2025 | Continuing ActivityCite this Report

Etna
Sicily Volcanic Province

The Sezione di Catania - Osservatorio Etneo (INGV) reported continuing activity at Etna during 28 April-4 May, characterized by Strombolian activity, lava fountains, and lava overflows at SE Crater and gas emissions at Bocca Nuova Crater, NE Crater, and Voragine. Activity at SE Crater began at 2357 on 29 April based on webcam views, though the views were obscured by dense weather clouds during the first hour. Visibility significantly improved at about 0200 on 30 April and by then lava was flowing over the SE Crater rim, with several branches advancing to the SE and S. Multiple vents at the summit of SE Crater produced explosive activity at variable intensities, with jets of material rising 300-400 m high. Strombolian explosions at the main vent in the W part of the crater became sustained at around 0245 producing pulsating lava fountains. Lava flows reached the base of the cone and fanned out towards Monte Frumento Supino. The activity decreased at around 0330 with lava fountaining changing to Strombolian activity that lasted for about three hours. By 0615 Strombolian activity was no longer visible and ash emissions rose 1,5 km above the summit and drifted SW. The ash emissions became discontinuous and then ceased at 0910. Satellite data from 2 May was used to map the flows. Both the SE and S flows were about 1.6 km long.

Source: Sezione di Catania - Osservatorio Etneo (INGV)

Great Sitkin (United States) | 30 April-6 May 2025 | Continuing ActivityCite this Report

Great Sitkin
Aleutian Ridge Volcanic Arc

The Alaska Volcano Observatory (AVO) reported that slow lava effusion continued to feed a thick flow in Great Sitkin’s summit crater during 29 April-6 May. Small daily earthquakes were detected by the seismic network. Slightly elevated temperatures were identified in a few satellite images during 30 April-1 May. Weather clouds often obscured satellite and webcam 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)

Ibu (Indonesia) | 30 April-6 May 2025 | Continuing ActivityCite this Report

Ibu
Halmahera Volcanic Arc

The Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG) lowered the Alert Level for Ibu to 2 (the second lowest level on a four-level scale) at 1700 on 1 May, based on visual observations and monitoring data that showed decreasing activity since February. Eruptive activity continued to be recorded, though plumes heights were lower and incandescent material was ejected only as far as 200 m from the crater rim. Seismic activity had decreased, and deformation data showed some signs of decreased pressure, or deflation. Daily gray, white-to-gray, or white-to-brown ash plumes rose 300-700 m above the crater rim and drifted in variable directions. Nighttime crater incandescence was visible in some webcam images. The public was advised to stay 2 km away from the active crater and 3.5 km away from the N crater wall opening.

Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)

Kanlaon (Philippines) | 30 April-6 May 2025 | Continuing ActivityCite this Report

Kanlaon
Negros-Sulu Volcanic Arc

The Philippine Institute of Volcanology and Seismology (PHIVOLCS) reported continuing eruptive activity at Kanlaon during 29 April-5 May. The seismic network recorded 7-22 daily volcanic earthquakes. Daily sulfur dioxide emissions ranged from 457 to 2,794 tonnes per day; emissions were not reported on 3 May. Gas-and-steam plumes with moderate densities rose 150-600 m above the crater rim and drifted NW, W, and SW. The plumes occasionally contained ash on 29 April. 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.

Source: Philippine Institute of Volcanology and Seismology (PHIVOLCS)

Karymsky (Russia) | 30 April-6 May 2025 | Continuing ActivityCite this Report

Karymsky
Eastern Kamchatka Volcanic Arc

The Kamchatkan Volcanic Eruption Response Team (KVERT) reported that thermal anomalies over Karymsky were identified in satellite images during 24 and 28-30 April and on 1 May. Explosive activity began on 29 April and ash plumes generated during 29-30 April and on 1 May drifted 120 km SE, E, and NE. KVERT issued a Volcano Observatory Notice for Aviation (VONA) noting that explosions occurred at 1320 and 1830 on 30 April; the ash plume from the second explosion rose 3.5-4 km (11,500-13,100 ft) a.s.l. Dates are based on UTC times; specific events are in local time where noted.

Source: Kamchatkan Volcanic Eruption Response Team (KVERT)

Kilauea (United States) | 30 April-6 May 2025 | Continuing ActivityCite this Report

Kilauea
Hawaiian-Emperor Hotspot Volcano Group

The Hawaiian Volcano Observatory (HVO) reported that the eruption within Kilauea’s Kaluapele summit caldera, from two vents along the SW margin of Halema’uma’u Crater, continued at variable levels during 22 April-6 May. Incandescence at the S vent was visible during 22-25 April, then at both the N and S vents during 26 April-1 May. Weak spattering at the N vent was visible just before 1850 on 27 April. A tiny lava pool at the S vent was visible overnight during 29-30 April. Spattering at the N vent was visible along with flames from hydrogen gas burning in air during 29 April-1 May. Sulfur dioxide emissions averaged 1,350 tonnes per day (t/d) on 30 April, typical levels during periods with no lava fountains.

At the N vent, cycles of dome fountaining, short lava overflows, and lava immediately draining back into the vent began at around 1149 on 1 May and lasted above nine hours. There were 26 cycles, with each lasting 10-15 minutes separated by about 10 minutes of repose. The activity intensified at around 1845. Lava fountains became sustained at 2128 and rose up to 100 m. Fountaining lasted for seven hours and 52 minutes, ceasing at 0520 on 2 May. Lava flows covered about half of the crater floor. Sulfur dioxide emissions averaged 1,750 t/d later that same day. Incandescence at both vents was visible overnight during 3-5 May. Occasional spattering at the N vent was visible during 4-5 May. Activity increased on 5 May. During 1049-1800 there were about 30 cycles of dome fountaining and lava draining back into the N vent. Lava overflowed the vent rim several times producing short lava flows. At 1123 a short lava flow from the S vent advanced onto the crater floor. Incandescence from both vents was visible overnight during 5-6 May. Lava fountaining at the N vent began at 1728 on 6 May and fountains quickly rose at least 150 m. Fast-moving lava flows traveled across the crater floor. Fountains also rose from the S vent as high as 20 m. Fast-moving lava flows from mainly the N vent and somewhat from the S vent traveled across the crater floor, covering less than half of it. Activity ceased at 2158. 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)

Lewotobi (Indonesia) | 30 April-6 May 2025 | Continuing ActivityCite this Report

Lewotobi
Sunda Volcanic Arc

The Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG) reported that eruptive activity at Lewotobi Laki-laki continued during 30 April-6 May. Daily white plumes rose as high as 700 m above the crater rim and drifted in various directions. At 0522 on 30 April a dense gray ash plume rose 4 km above the crater rim and drifted N and NE. Incandescent material on the flanks was possibly visible in a webcam image from 0535. At 1107 on 2 May a dense gray-to-brown ash plume rose 3.5 km above the crater rim and drifted N and NE. Ash plumes at 1200 on 2 May and at 2106 on 3 May rose 1 km and 800 m above the crater rim, respectively, and drifted SW and W. The Alert Level remained at 3 (on a scale of 1-4) and the public was warned to stay 6 km away from the center of Laki-laki.

Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)

Lewotolok (Indonesia) | 30 April-6 May 2025 | Continuing ActivityCite this Report

Lewotolok
Sunda Volcanic Arc

The Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG) reported that an eruption at Lewotolok was ongoing during 30 April-5 May. Daily white steam-and-gas plumes rose as high as 100 m above the summit of the cone and drifted NW, W, and SW. Nighttime webcam images showed incandescent material being ejected above the summit. Ash plumes rose 400-600 m and drifted SE and W during 3-4 May. 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)

Marapi (Indonesia) | 30 April-6 May 2025 | Continuing ActivityCite this Report

Marapi
Sunda Volcanic Arc

The Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG) reported that eruptive activity from Verbeek Crater at Marapi (on Sumatra) continued during 30 April-6 May. Eruptive events were detected at 1816 on 30 April and at 1438 on 1 May, though the events were not visually observed. At 1812 on 3 May an ash plume rose 800 m above the summit and drifted NE. An eruptive event was detected at 1331 on 4 May, though not visually observed. At 2209 on 4 May a dense gray ash plume rose 1 km above the summit and drifted E. Incandescence at the summit was visible in an image from 2226 that same day. 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)

Merapi (Indonesia) | 30 April-6 May 2025 | Continuing ActivityCite this Report

Merapi
Sunda Volcanic Arc

The Balai Penyelidikan dan Pengembangan Teknologi Kebencanaan Geologi (BPPTKG) reported that the eruption at Merapi (on Java) continued during 25 April-1 May. Seismicity remained at high levels. The SW lava dome produced 62 lava avalanches that traveled as far as 2 km SW down the Bebeng drainage, 47 that traveled as far as 2 km SW down the Krasak drainage, and 148 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 of material. The hottest temperature was 249.3 degrees Celsius, and the volume of the dome had grown to an estimated 3,925,200 cubic meters, based on webcam images and a 26 April drone survey. 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)

Nyamulagira (DR Congo) | 30 April-6 May 2025 | Continuing ActivityCite this Report

Nyamulagira
Albertine Rift Volcanic Province

Satellite images acquired on 21 and 26 April and on 1 May showed continuing activity at Nyamulagira. Though weather clouds particularly obscured the summit area in all three scenes, bright thermal anomalies indicated continuing activity at the summit crater and active lava flows on the W flank.

Source: Copernicus

Popocatepetl (Mexico) | 30 April-6 May 2025 | Continuing ActivityCite this Report

Popocatepetl
Trans-Mexican Volcanic Arc

The Centro Nacional de Prevención de Desastres (CENAPRED) reported that eruptive activity continued at Popocatépetl during 29 April-4 May. The seismic network recorded 11-35 long-period events per day, accompanied by steam-and-gas emissions; ash was detected in the emissions during 29-30 April. In addition, the seismic network recorded daily periods of tremor, sometimes characterized by harmonic and high-frequency signals, lasting from 34 minutes to three hours and 52 minutes. According to the Washington VAAC an ash plume was visible in webcam and satellite images on 10 April rising 5.8 km (20,000 ft) a.s.l. (about 400 m above the crater rim) and drifting SW. An event at around 0100 on 5 May ejected material onto the upper flanks and produced an ash plume that rose 6.4 km (21,000 ft) a.s.l. (as high as 1 km above the crater rim) and drifted E and ESE. The Alert Level remained at Yellow, Phase Two (the middle level on a three-color scale) and the public was warned to stay 12 km away from the crater.

Sources: Centro Nacional de Prevencion de Desastres (CENAPRED), Washington Volcanic Ash Advisory Center (VAAC)

Reventador (Ecuador) | 30 April-6 May 2025 | Continuing ActivityCite this Report

Reventador
Northern Andean Volcanic Arc

The Instituto Geofísico-Escuela Politécnica Nacional (IG-EPN) reported that eruptive activity continued at Reventador during 9-15 April. Seismicity included 57-100 daily explosions, long-period earthquakes, harmonic tremor, and tremor associated with emissions. Multiple daily ash-and-gas plumes rose 300-1,300 m above the crater rim and drifted mainly NW, W, and SW. Webcams recorded multiple nightly instances of incandescent material descending the flanks as far as 1.1 km below the crater rim, particularly down the S and SE flanks. Weather clouds occasionally obscured views. Secretaría de Gestión de Riesgos maintained the Alert Level at Orange (the second highest level on a four-color scale).

Sources: Instituto Geofísico-Escuela Politécnica Nacional (IG-EPN), Secretaría de Gestión de Riesgos (SGR)

Semeru (Indonesia) | 30 April-6 May 2025 | Continuing ActivityCite this Report

Semeru
Sunda Volcanic Arc

The Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG) reported that activity continued at Semeru during 30 April-6 May, with multiple daily eruptive events recorded by the seismic network. Daily white-and-gray ash plumes rose 400-1,000 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 5 km away from the summit in all directions, 13 km from the summit to the SE, 500 m from the banks of the Kobokan drainage as far as 17 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)

Sheveluch (Russia) | 30 April-6 May 2025 | Continuing ActivityCite this Report

Sheveluch
Eastern Kamchatka Volcanic Arc

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 24 April-1 May. Daily thermal anomalies over the domes were identified in satellite images. The Aviation Color Code remained at Orange (the second highest level on a four-color scale). Dates are based on UTC times; specific events are in local time where noted.

Source: Kamchatkan Volcanic Eruption Response Team (KVERT)

Suwanosejima (Japan) | 30 April-6 May 2025 | Continuing ActivityCite this Report

Suwanosejima
Ryukyu Volcanic Arc

The Japan Meteorological Agency (JMA) reported that eruptive activity at Suwanosejima's Ontake Crater continued during 28 April-5 May. Incandescence was observed nightly in webcam images. An explosion at 0901 on 5 May generated an ash plume that rose 700 m above the crater rim and drifted S. 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)

Weekly Reports Archive

Since the Weekly Volcanic Activity Report began in November 2000, there have been 21,423 individual reports over 1,276 weeks (average of 17 per week) on 339 different volcanoes.

Search by Date

Use the dropdowns to choose the year and week for archived Weekly Reports.

Search by Volcano

Puyehue-Cordon Caulle

Suoh

Ambae

Dieng Volcanic Complex

Antillanca Volcanic Complex

Atka Volcanic Complex

Etorofu-Yakeyama [Grozny Group]

Fournaise, Piton de la

Moyorodake [Medvezhia]

Northern EPR at 9.8°N

Campi Flegrei del Mar di Sicilia

Guallatiri

Krummel-Garbuna-Welcker

Krysuvik-Trolladyngja

Whakaari/White Island

Palena Volcanic Group

Soufriere St. Vincent

Zhupanovsky

Concepcion

Hunga Tonga-Hunga Ha'apai

Lengai, Ol Doinyo

Pavlof

South Sarigan Seamount

News Feeds and Google Placemarks

Download Smithsonian / USGS Weekly Volcanic Activity Report Network RSS Feed

The RSS (Really Simple Syndication) feed is identical to the Weekly Volcanic Activity Report minus some features including the header information (latitude and longitude and summit elevation), the Geologic Summary, and a link to the volcano's page from the Global Volcanism Program. At the end of each report is a list of the sources used. Each volcano report includes a link from the volcano's name back to the more complete information in the Weekly Volcanic Activity Report on the Smithsonian website. This feature was first made available on 5 March 2008.

Download Smithsonian / USGS Weekly Volcanic Activity Report Network CAP Feed

The CAP (Common Alerting Protocol) feeds are XML files specifically formatted for disaster management. They are similar in content to the RSS feed, but contain no active links.

Download Smithsonian / USGS Weekly Volcanic Activity Report Network Link

A Google Earth network link for the Weekly Volcanic Activity Report can be loaded into the free Google Earth software, and in turn will load placemarks for volcanoes in the current weekly report. Placemark balloons include the volcano name, report date, report text, sources, and links back to the GVP volcano profile page and to the complete Weekly Report for that week. This feature was first made available on 1 April 2009.

Criteria & Disclaimers

Criteria

The Weekly Volcanic Activity Report does not necessarily include all volcanic activity that occurred on Earth during the week. More than a dozen volcanoes globally have displayed more-or-less continuous eruptive activity for decades or longer, and such routine activity is typically not reported here. Moreover, Earth's sea-floor volcanism is seldom reported even though in theory it represents the single most prolific source of erupted material. The Weekly Volcanic Activity Report summarizes volcanic activity that meets one or more of the following criteria:

- A volcano observatory raises or lowers the alert level at the volcano.
- A volcanic ash advisory has been released by a volcanic ash advisory center (VAAC) stating that an ash cloud has been produced from the volcano.
- A verifiable news report of new activity or a change in activity at the volcano has been issued.
- Observers have reported a significant change in volcanic activity. Such activity can include, but is not restricted to, pyroclastic flows, lahars, lava flows, dome collapse, or increased unrest.

Volcanoes are included in the "New Activity/Unrest" section of the Weekly Volcanic Activity Report if the activity occurs after at least 3 months of quiescence. Once a volcano is included in the "New Activity/Unrest" section, updates will remain in that section unless the activity continues for more than 1 month without escalating, after which time updates will be listed in the "Continuing Activity" section. Volcanoes are also included in the "New Activity/Unrest" section if the volcano is undergoing a period of relatively high unrest, or increasing unrest. This is commonly equal to Alert Level Orange on a scale of Green, Yellow, Orange, Red, where Red is the highest alert. Or alert level 3 on a scale of 1-4 or 1-5.

It is important to note that volcanic activity meeting one or more of these criteria may occur during the week, but may not be included in the Weekly Volcanic Activity Report because we did not receive a report.

Disclaimers

1. The Weekly Volcanic Activity Report is intended to provide timely information about global volcanism on a weekly basis. Consequently, the report is generated rapidly by summarizing volcanic reports from various sources, with little time for fact checking. The accuracy of the Weekly Volcanic Activity Report is dependent upon the quality of the volcanic activity reports we receive. Reports published in the Bulletin of the Global Volcanism Network are cover longer time periods and are more carefully reviewed, although all of the volcanoes discussed in the Weekly Volcanic Activity Report are not necessarily reported in the Bulletin. Because of our emphasis on rapid reporting on the web we have avoided diacritical marks. Reports are updated on the Weekly Volcanic Activity Report web page as they are received, therefore information may be included regarding events that occurred before the current report period.

2. Rapidly developing events lead to coverage that is often fragmentary. Volcanoes, their eruptions, and their plumes and associated atmospheric effects are complex phenomena that may require months to years of data analysis in order to create a comprehensive summary and interpretation of events.

3. Preliminary accounts sometimes contain exaggerations and "false alarms," and accordingly, this report may include some events ultimately found to be erroneous or misleading.

4. Many news agencies do not archive the articles they post on the Internet, and therefore the links to some sources may not be active. To obtain information about the cited articles that are no longer available on the Internet contact the source.

5. USGS Disclaimer Statement for this Website:

Information presented on this website is considered public information and may be distributed or copied. Use of appropriate byline/photo/image credit is requested. We strongly recommend that USGS data be acquired directly from a USGS server and not through other sources that may change the data in some way. While USGS makes every effort to provide accurate and complete information, various data such as names, telephone numbers, etc. may change prior to updating. USGS welcomes suggestions on how to improve our home page and correct errors. USGS provides no warranty, expressed or implied, as to the accuracy, reliability or completeness of furnished data.

Some of the documents on this server may contain live references (or pointers) to information created and maintained by other organizations. Please note that USGS does not control and cannot guarantee the relevance, timeliness, or accuracy of these outside materials.

For site security purposes and to ensure that this service remains available to all users, this government computer system employs software programs to monitor network traffic to identify unauthorized attempts to upload or change information, or otherwise cause damage. Unauthorized attempts to upload information or change information on this website are strictly prohibited and may be punishable under the Computer Fraud and Abuse Act of 1986 and the National Information Infrastructure Protection Act. Information may also be used for authorized law enforcement investigations. (Last modified September 21, 1999.)

U.S. Department of the Interior, U.S. Geological Survey, Reston, VA, USA
URL: https://volcano.si.edu/reports_weekly.cfm