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 22 January-28 January 2025
Name	Country	Volcanic Region	Eruption Start Date	Report Status
Ahyi	United States	Mariana Volcanic Arc	2024 Aug 5	New
Ibu	Indonesia	Halmahera Volcanic Arc	2008 Apr 5	New
Kilauea	United States	Hawaiian-Emperor Hotspot Volcano Group	2024 Dec 23	New
Purace	Colombia	Northern Andean Volcanic Arc	—	New
Whakaari/White Island	New Zealand	Taupo Volcanic Zone	2024 May 24	New
Aira	Japan	Ryukyu Volcanic Arc	2017 Mar 25	Continuing
Dukono	Indonesia	Halmahera Volcanic Arc	1933 Aug 13	Continuing
El Misti	Peru	Central Andean Volcanic Arc	—	Continuing
Fuego	Guatemala	Central America Volcanic Arc	2002 Jan 4	Continuing
Great Sitkin	United States	Aleutian Ridge Volcanic Arc	2021 May 25	Continuing
Kanlaon	Philippines	Negros-Sulu Volcanic Arc	2024 Oct 19	Continuing
Karymsky	Russia	Eastern Kamchatka Volcanic Arc	2024 Jun 20	Continuing
Lewotobi	Indonesia	Sunda Volcanic Arc	2023 Dec 23	Continuing
Marapi	Indonesia	Sunda Volcanic Arc	2023 Dec 3	Continuing
Merapi	Indonesia	Sunda Volcanic Arc	2020 Dec 31	Continuing
Poas	Costa Rica	Central America Volcanic Arc	—	Continuing
Reventador	Ecuador	Northern Andean Volcanic Arc	2008 Jul 27	Continuing
Sabancaya	Peru	Central Andean Volcanic Arc	2016 Nov 6	Continuing
Sangay	Ecuador	Northern Andean Volcanic Arc	2019 Mar 26	Continuing
Santa Maria	Guatemala	Central America Volcanic Arc	1922 Jun 22	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
Ubinas	Peru	Central Andean Volcanic Arc	—	Continuing

All times are local unless otherwise stated.

Ahyi (United States) | 22 January-28 January 2025 | New Activity / Unrest Cite this Report

Ahyi
Mariana Volcanic Arc

Unrest at Ahyi Seamount continued through 24 January. Satellite images showed a plume of discolored water in the vicinity of the seamount on 18 January, indicating possible submarine activity. No signals coming from the direction of Ahyi were identified in data from underwater pressure sensors near Wake Island (about 2,270 km E of Ahyi). 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

Ibu (Indonesia) | 22 January-28 January 2025 | New Activity / Unrest Cite this Report

Ibu
Halmahera Volcanic Arc

The Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG) reported that the eruption at Ibu continued during 22-28 January, with a decrease in eruptive activity resulting in the Alert Level being lowered from Level 4 to Level 3 (on a scale of 1 to 4) at 1700 on 28 January. Additionally, the recommended exclusion zone was adjusted in response to the new Alert Level status, with the public now advised to maintain a distance of at least 4 km from the eruption center, except in the N sector, where the distance extends to 5 km from the N crater wall opening. Eruptive events were recorded daily, generating gray and white-to-gray ash plumes that rose at least 1.2 km above the summit and drifted multiple directions. Webcam images posted with the eruption reports showed incandescence at the summit and occasionally incandescent material being ejected above the summit during explosions. In a special report, PVMBG noted that the lava dome growing in the crater had exceeded the crater wall height, resulting in small collapse avalanches onto the N and NW flanks. Deformation monitoring data (Electronic Distance Measurement surveys) showed a deflationary trend between 1 and 27 January.

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

Kilauea (United States) | 22 January-28 January 2025 | New Activity / Unrest Cite this Report

Kilauea
Hawaiian-Emperor Hotspot Volcano Group

The Hawaiian Volcano Observatory (HVO) reported that the eruption within Kilauea’s Kaluapele summit caldera continued during 22-28 January from vents along the SW margin of Halema’uma’u Crater. Sulfur dioxide emissions were last recorded on 19 January, after the end of a lava-fountaining episode, and averaged around 800 tonnes per day; sulfur dioxide emissions likely continued at similar levels during 20-21 January. Incandescence was strong at the N vent during 21-22 January, and weak, intermittent spatter from the N vent was visible early on 22 January. Sustained spattering began at about 1457 on 22 January around the time seismic tremor increased, deflation was detected near the vent, and a sulfur dioxide gas discharge was estimated at more than 10,000 tonnes per day. Lava flows were established by 1459, followed at 1551 by domed fountains rising 5-10 m. The activity continued overnight during 22-23 January with lava fountains rising 30-50 m. Pele’s hair fell at the Steaming Bluff parking area and lava flows covered about half of the crater floor. Eruptive activity at the N vent paused at 0430 on 23 January. Intense incandescence from the N vent and spots of orange glow from the crater floor were visible overnight during 23-24 January.

Small, sporadic spattering at the N vent began at around 1800 on 24 January, strengthening into sustained lava fountains by 2315, and then lava flows advancing onto the crater floor at 2328. Lava fountains were rising as high as 45 m by midnight, and a second flow had developed. Fountain heights began to decrease at 0200 on 25 January and by 0300 they were 15-30 m high, and the second lava flow was no longer active. Nearly half of the crater floor had been covered by lava. Lava fountain activity gradually declined throughout the morning and lava flows from the N vent stopped at 1236. A large area of erupted lava overturned around 1358 during a period when lava was draining back into the N vent, and the lava surface at the center of the crater floor dropped about 0.5 m. Spots of orange glow on the crater floor were visible as the lava cooled. Strong incandescence at the N vent was visible.

Around 1330 on 27 January small, sporadic spatter fountains began again and continued to intensify into sustained fountaining by 1841. At 1940 fountains from the N vent were 30-40 m high and fed multiple lava flows. A small fountain at the S vent fed a small flow from the S side of its cone. By 0740 on 28 January the fountains at the N vent were about 40-45 m high and at the S vent were about 30 m high. Then at 1043 the S vent stopped erupting followed by the N vent at 1047. Lava flows covered more than half 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)

Purace (Colombia) | 22 January-28 January 2025 | New Activity / Unrest Cite this Report

Purace
Northern Andean Volcanic Arc

The Servicio Geologico Colombiano (SGC) reported that the amplitude of seismic tremor at Puracé increased during the afternoon of 21 January and remained elevated through 23 January. Satellite images captured on 23 January showed a system of cracks and cavities formed during the ash emission on 20 January. Gas-and-steam emissions rose from previously existing fumarolic vents at the Puracé cone and from the two new vents that had opened days before at the Curiquinga cone, located immediately SE of Puracé. Significant levels of sulfur dioxide emissions continued to be detected by instruments at the Puracé summit. Strong sulfur dioxide odors were reported in the communities of Paletará (16 km SW), Puracé (11 km NW), and Popayán (Cauca, 30 km NW). The Alert Level remained at Yellow (the second lowest level on a four-color scale).

Source: Servicio Geológico Colombiano (SGC)

Whakaari/White Island (New Zealand) | 22 January-28 January 2025 | New Activity / Unrest Cite this Report

Whakaari/White Island
Taupo Volcanic Zone

On 28 January GeoNet reported that emissions from Whakaari/White Island during the previous few weeks were characterized as weak-to-moderate gas-and-steam plumes that frequently contained minor amounts of ash. The plumes were visible in images from satellite and webcams (at Whakatane and Te Kaha), and during clearer weather conditions a larger plume was occasionally visible from the Bay of Plenty. The New Zealand Met Service also detected ash in the plumes using satellite images on some of the days. Ash was not visible in emissions during a midday observation overflight on 14 January, but during an overflight to measure volcanic gases later that afternoon, ash was visible in the emissions; sulfur dioxide gas flux was higher compared to periods of lower volcanic activity. A minor event where ash was visible in the plume was recorded in webcam images at 0710 on 27 January. The activity was consistent with moderate-to-heightened levels of unrest, therefore the Volcanic Alert Level remained at 2 (on a scale of 0-5). The Aviation Color Code remained at Orange (the second highest level on a four-color scale) due to the presence of ash in the emissions. GeoNet stated that the Alert Levels were reflective of the current level of activity, but there was uncertainty due to the current lack of consistent, usable, real-time monitoring data; GeoNet relies on remote cameras and satellite images to monitor Whakaari.

Source: GeoNet

Aira (Japan) | 22 January-28 January 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 20-27 January. Nightly crater incandescence was visible in webcam images. On 20 January sulfur dioxide emissions were extremely high, averaging 3,200 tons per day. Explosions at 1220 on 21 January, 1709 and 2246 on 22 January, 0243 on 23 January, and 1626 on 25 January produced ash plumes that rose 800-2,500 m above the crater rim and drifted E, SE, S, and SW. Some explosions ejected large blocks 900-1,300 m from the crater rim. The Alert Level remained at 3 (on a 5-level scale), and the public was warned to stay 1 km away from both craters.

Source: Japan Meteorological Agency (JMA)

Dukono (Indonesia) | 22 January-28 January 2025 | Continuing ActivityCite this Report

Dukono
Halmahera Volcanic Arc

The Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG) reported that explosive activity continued at Dukono during 22-28 January. Emissions were observed daily; white-and-gray emissions rose as high as 800 m above the summit. Seismicity included 189-340 daily explosion events and episodes of continuous tremor. The Alert Level remained at Level 2 (on a scale of 1 to 4), and the public was warned to stay outside of the 4-km exclusion zone.

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

El Misti (Peru) | 22 January-28 January 2025 | Continuing ActivityCite this Report

El Misti
Central Andean Volcanic Arc

The Instituto Geofísico del Perú (IGP) reported that a lahar descended the SE flank of El Misti at 1054 on 27 January. The public was warned to stay away from drainages and roads on that flank. The Alert Level remained at Green (the lowest level on a four-color scale).

Source: Instituto Geofísico del Perú (IGP)

Fuego (Guatemala) | 22 January-28 January 2025 | Continuing ActivityCite this Report

Fuego
Central America Volcanic Arc

The Instituto Nacional de Sismología, Vulcanología, Meteorología e Hidrología (INSIVUMEH) reported that low-level eruptive activity continued at Fuego during 22-28 January. Conditions for observation were often unfavorable. Weak explosions were reported on 23 and 26 January, and weak rumbling sounds were heard on 24 January. At night and early morning on 24 and 28 January crater incandescence was observed. Almost daily gas-and-steam emissions were reported rising as high as 750 m above the summit and drifted S, SW, and W.

Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)

Great Sitkin (United States) | 22 January-28 January 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 lava flow in Great Sitkin’s summit crater during 21-28 January. The local seismic network did not detect any small earthquakes on most or all days during the week. Cloudy satellite and webcam images prevented clear observations. 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)

Kanlaon (Philippines) | 22 January-28 January 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 22-28 January. The seismic network recorded 8-35 daily volcanic earthquakes. Volcanic tremor was recorded during 25-27 January with 3-11 periods lasting 4-38 minutes at a time. Average daily sulfur dioxide emissions ranged from 1,691 to 4,222 tonnes per day. Continuous moderate to voluminous gas-and-steam emissions with occasional ash content rose 100-900 m above the summit and drifted SW and W. During 23-27 January there were 1-14 periods of ash emission lasting 2-65 minutes. 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) | 22 January-28 January 2025 | Continuing ActivityCite this Report

Karymsky
Eastern Kamchatka Volcanic Arc

The Kamchatkan Volcanic Eruption Response Team (KVERT) reported moderate levels of activity at Karymsky during 16-23 January. A weak thermal anomaly over the volcano was identified in satellite images. The Aviation Color Code remained at Orange (the third 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)

Lewotobi (Indonesia) | 22 January-28 January 2025 | Continuing ActivityCite this Report

Lewotobi
Sunda Volcanic Arc

The Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG) reported that eruptive activity continued at Lewotobi Laki-laki during 22-28 January. Explosive events were recorded on 22-23 and 25-27 January, generating gray or white-to-gray ash plumes that rose at least 1.6 km above the summit and drifted in multiple directions, though daily emissions were also observed in the absence of eruptions. Webcam images posted with the reports showed daily incandescence at the summit and incandescent material being ejected above the summit of the inner active cone during explosions. Faint rumbling was heard at the Lewotobi Laki-laki Observation Post (7 km WNW) on 28 January. The Alert Level remained at 3 (on a scale of 1-4) and the public was warned to stay 5 km away from the center of Laki-laki and 6 km in a semicircle counterclockwise from the NE to the SW.

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

Marapi (Indonesia) | 22 January-28 January 2025 | Continuing ActivityCite this Report

Marapi
Sunda Volcanic Arc

The Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG) reported that eruptive activity at Marapi (on Sumatra) was ongoing during 22-28 January. White and gray gas-and-ash plumes rose as high as 750 m above the summit on 22, 26, and 28 January. White gas-and-steam emissions rose as high as 200 m above the summit on 25 and 27 January; no emissions were observed during 23-24 January. 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) | 22 January-28 January 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 17-23 January. Seismicity was less intense than the previous week. The SW lava dome produced 28 lava avalanches that traveled as far as 2 km SW down the Bebeng drainage, 19 that traveled as far as 1.7 km SW down the Krasak drainage, and 19 that traveled as far as 1.6 km SW down the Sat/Putih drainage. Morphological changes at the SW dome were caused by continuing effusion and collapses of material. No significant morphological changes at the summit dome were visible. 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)

Poas (Costa Rica) | 22 January-28 January 2025 | Continuing ActivityCite this Report

Poas
Central America Volcanic Arc

The Observatorio Vulcanológico y Sismológico de Costa Rica-Universidad Nacional (OVSICORI-UNA) reported an explosive eruption at Poás at 0602 on 23 January, but due to weather conditions no visual observations were made. A VONA issued late on 24 January with no supporting details about the activity was retracted the next day by OVSICORI-UNA, noting that there had been no eruption. Volcanic tremor was high but fluctuated throughout the week. High SO2 flux was reported at 400 tons per day (t/d) on 24 January. An increase in uplift deformation was reported on 24 and 27 January.

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

Reventador (Ecuador) | 22 January-28 January 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 22-28 January. Seismicity was not reported on 22-23 January and only partly recorded on the morning of 24 January, with 22 explosions, due to data transmission issues with the seismic monitoring equipment. From the afternoon of 24 January to the morning of 28 January, seismicity included 63-79 daily explosions, long-period earthquakes, harmonic tremor, and tremor associated with emissions. Weather conditions occasionally obscured views of summit activity; however, when the weather permitted, ash-and-gas plumes were observed in webcam and/or satellite images rising 300-1,300 m above the crater and drifting W, WNW, and NW. The Washington VAAC also issued alerts for ash and gas emissions. The surveillance camera network recorded multiple instances of incandescent material descending as far as 800 m below the crater rim overnight 24-27 January. Secretaría de Gestión de Riesgos maintained the Alert Level at Orange (the second highest level on a four-color scale).

Source: Instituto Geofísico-Escuela Politécnica Nacional (IG-EPN)

Sabancaya (Peru) | 22 January-28 January 2025 | Continuing ActivityCite this Report

Sabancaya
Central Andean Volcanic Arc

The Instituto Geofísico del Perú (IGP) reported that the eruption at Sabancaya continued during 20-26 January with a daily average of three explosions. Gas-and-ash plumes rose as high as 500 m above the summit and drifted less than 10 km W and SW. Thermal anomalies over the lava dome in the summit crater were identified in satellite data. Sulfur dioxide emissions were at moderate levels, averaging 814 tons per day. No thermal anomalies or significant deformation were detected. The Alert Level remained at Orange (the third level on a four-color scale) and the public was warned to stay outside of a 12 km radius from the summit.

Source: Instituto Geofísico del Perú (IGP)

Sangay (Ecuador) | 22 January-28 January 2025 | Continuing ActivityCite this Report

Sangay
Northern Andean Volcanic Arc

The Instituto Geofísico-Escuela Politécnica Nacional (IG-EPN) reported that eruptive activity continued at Sangay during 22-28 January. The seismic network recorded 52-165 daily explosions. During 22-24 and 27 January, gas-and-ash emissions observed in webcam and/or satellite images rose as high as 1.8 km above the summit and drifted multiple directions. The Washington VAAC also issued alerts for ash and gas emissions on those dates. Weather clouds obscured views of summit activity on 25-26 and 28 January. The surveillance camera network recorded multiple instances of incandescence in the crater area during the nights of 22 and 23 January. Secretaría de Gestión de Riesgos (SGR) maintained the Alert Level at Yellow (the second highest level on a four-color scale).

Source: Instituto Geofísico-Escuela Politécnica Nacional (IG-EPN)

Santa Maria (Guatemala) | 22 January-28 January 2025 | Continuing ActivityCite this Report

Santa Maria
Central America Volcanic Arc

The Instituto Nacional de Sismología, Vulcanología, Meteorología e Hidrología (INSIVUMEH) reported ongoing eruptive activity at Santa Maria’s Santiaguito dome complex during 22-28 January with continuing lava extrusion at Caliente dome. Daily explosions, as many as 6 per hour when reported, generated gas-and-ash plumes that rose as high as 1.2 km above the dome and drifted SW, W, and NW. Effusion of blocky lava and collapses of material produced block avalanches that descended the flanks in multiple directions almost daily; the avalanches could sometimes be heard in areas several kilometers away. Collapsed material produced short pyroclastic flows on 26 and 27 January. Incandescence at the crater was sometimes visible during dark hours. On 28 January ashfall was reported in Las Marías (9.5 km S), Finca El Patrocinio (8 km SW), San Marcos (10 km SW), Loma Linda Palajunoj (7 km SW), and other nearby communities, and forecasted for areas downwind on most days.

Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)

Semeru (Indonesia) | 22 January-28 January 2025 | Continuing ActivityCite this Report

Semeru
Sunda Volcanic Arc

The Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG) reported that eruptive activity continued at Semeru during 22-28 January with several daily eruptive events recorded by the seismic network. Gray or white-and-gray ash plumes rose 400-1,200 m above the summit and drifted in several 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) | 22 January-28 January 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 16-23 January. Daily thermal anomalies over the domes were identified in satellite images. Gas-and-steam plumes with variable amounts of ash drifted 60 km NE during 20-21 January, and plumes of resuspended ash drifted 300 km SE during 21-23 January. 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) | 22 January-28 January 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 20-27 January. Incandescence was observed nightly in webcam images. Discrete eruption events were recorded at 1217 and 1407 on 22 January and at 0754 on 23 January. Eruptions produced ash plumes that reached 1.2-1.5 km above the crater rim, and ash drifted to the N and SW. One explosive event, detected by infrasound monitoring equipment at 1527 on 25 January, produced ash emissions that reached 800 m above the crater rim and drifted SW. Ballistic projectiles were ejected as far as 300 m from the center of the crater. Tremor accompanied the eruption events and ashfall was reported by the Suwanosejima Branch of the Toshima Village Office (3.5 km SSW). The Alert Level remained at 2 (the second level on a five-level scale) and the public was warned to stay at least 1.5 km away from the crater.

Source: Japan Meteorological Agency (JMA)

Ubinas (Peru) | 22 January-28 January 2025 | Continuing ActivityCite this Report

Ubinas
Central Andean Volcanic Arc

The Instituto Geofísico del Perú (IGP) reported that a lahar descended the Volcánmayo drainage on the SE flank of Ubinas at 1930 on 25 January. The public was warned to stay away from the drainage and to avoid driving on the Querapi-Ubinas-Huarina highway. The Alert Level remained at Yellow (the second level on a four-color scale) and the public was warned to stay 2 km away from the crater.

Source: Instituto Geofísico del Perú (IGP)

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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.

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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