USGS Volcano Current Alerts

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Recent Volcano Updates from the U.S. Geological Survey Volcano Hazards Program
Updated: 2 hours 15 min ago

AVO Great Sitkin YELLOW/ADVISORY - Seismicity elevated; small explosion mid-week; no ash cloud observed

Fri, 12/14/2018 - 18:32
Dec 14, 2018 23:38 - Low-level unrest continues at Great Sitkin Volcano. Seismicity remains elevated with small earthquakes occurring at rates above background levels. A small explosion, detected in seismic data, occurred on Tuesday morning, December 11, at 6:05 AM AKST (15:05 UTC). The explosion was not recorded by the nearby infrasound array on Adak Island, and no eruption cloud was observed in satellite data. No other eruptive activity was detected over the past week. Great Sitkin Volcano is monitored with a local real-time seismic network, which will typically allow AVO to detect ...
Categories: Volcano Reports

AVO Cleveland ORANGE/WATCH - Two small explosions occurred this week; no ash clouds observed

Fri, 12/14/2018 - 18:32
Dec 14, 2018 23:38 - Two small explosions occurred at Cleveland volcano during the past week. The first happened Saturday, December 8, at 11:55 PM AKST (08:55 UTC on Dec 9). The second, which had a higher peak seismic amplitude, occurred Wednesday, December 12, at 11:53 AM AKST (20:53 UTC). No ash cloud was observed after either event, though satellite views were largely obscured by clouds at the time. The color code and alert level were raised to Orange/Watch after the second explosion. Elevated surface temperatures at the volcano's summit were also occasionally observed in satellite imagery ...
Categories: Volcano Reports

AVO Semisopochnoi YELLOW/ADVISORY - No eruptive activity observed; seismic network offline

Fri, 12/14/2018 - 18:32
Dec 14, 2018 23:38 - No eruptive activity was observed in satellite imagery or regional infrasound data over the past week. The satellite link that transmits seismic data from Semisopochnoi failed on November 1, but an infrasound array on Adak Island should detect significant explosive emissions from Semisopochnoi (with a 13-minute delay) if atmospheric conditions permit. A return to eruptive activity remains a possibility at Semisopochnoi and it could occur with little or no warning. AVO will continue to monitor the volcano closely. Semisopochnoi is normally monitored with an ...
Categories: Volcano Reports

AVO Veniaminof ORANGE/WATCH - Eruption pauses; resumes Dec 13 with plume and elevated surface temperatures

Fri, 12/14/2018 - 18:32
Dec 14, 2018 23:38 - Veniaminof's ongoing eruption paused, or at least declined dramatically, for several days starting late last week, but has since resumed. The character of the seismicity began to change on Thursday, December 6, and, over the following days, the continuous tremor recorded before then began to wax and wane and was replaced by low-frequency seismic events and weak tremor bursts. High-resolution satellite imagery acquired on Monday, December 10, suggested that the relatively long-lived discharge of a lava from the volcano's intracaldera cone had stopped, though weak explosive ...
Categories: Volcano Reports

CVO Cascade Range GREEN/NORMAL - All volcanoes are at normal levels.

Fri, 12/14/2018 - 15:33
Dec 14, 2018 21:08 - Activity Update: All volcanoes in the Cascade Range of Oregon and Washington are at normal background levels of activity. These include Mount Baker, Glacier Peak, Mount Rainier, Mount St. Helens, and Mount Adams in Washington State; and Mount Hood, Mount Jefferson, Three Sisters, Newberry, and Crater Lake in Oregon. Recent Observations: Monitoring systems show that activity at Cascade Range volcanoes remained at background levels throughout the week. Due to winter storms in the Cascades, wind noise dominates many of the seismograph records.
Categories: Volcano Reports

AVO Great Sitkin YELLOW/ADVISORY - Seismicity remains elevated; no eruptive activity observed

Thu, 12/13/2018 - 14:32
Dec 13, 2018 20:30 - Low-level unrest continues at Great Sitkin volcano. Numerous small earthquakes associated with the ongoing unrest continue to be recorded on the local seismic network. No eruptive activity was observed in partly cloudy to cloudy satellite views of the volcano over the past day. No explosive activity was detected on a regional infrasound array on Adak Island. Great Sitkin volcano is monitored with a local real-time seismic network, which will typically allow AVO to detect changes in unrest that may lead to an explosive eruption. Rapid detection of an ash-producing ...
Categories: Volcano Reports

AVO Cleveland ORANGE/WATCH - No eruptive activity observed

Thu, 12/13/2018 - 14:32
Dec 13, 2018 20:30 - Low-level unrest continues at Cleveland volcano. No significant activity has been detected in seismic or regional infrasound data since yesterday's small explosion. No activity was observed in partly cloudy to cloudy satellite views. Cleveland volcano is monitored by only two seismic stations, which restricts AVO's ability to detect precursory unrest that may lead to an explosive eruption. Rapid detection of an ash-producing eruption may be possible using a combination of seismic, infrasound, lightning, and satellite data. The web camera, one seismic station, and the ...
Categories: Volcano Reports

AVO Semisopochnoi YELLOW/ADVISORY - No eruptive activity observed; seismic data offline

Thu, 12/13/2018 - 14:32
Dec 13, 2018 20:30 - Unrest continues at Semisopochnoi volcano. No eruptive activity was detected over the past day in regional infrasound data or cloudy satellite views of the volcano. Local seismic data remains offline. Semisopochnoi is monitored with an on-island seismic network, though this is currently off-line, and remotely by satellite and lightning sensors. Furthermore, an infrasound array on Adak Island may detect explosive emissions from Semisopochnoi with a 13 minute delay if atmospheric conditions permit.
Categories: Volcano Reports

AVO Veniaminof ORANGE/WATCH - Seismicity remains elevated; lava effusion appears to have stopped

Thu, 12/13/2018 - 14:32
Dec 13, 2018 20:30 - Webcam and satellite imagery collected over the past several days suggests that effusion of lava from Veniaminof's intracaldera cone has stopped. However, the local seismic network continues to record low-frequency seismic events and weak tremor bursts, so it is possible that weak eruptive activity may still be happening. Veniaminof volcano is monitored with a local real-time seismic network, which will typically allow AVO to detect changes in unrest that may lead to a more significant explosive eruption. AVO combines seismic, infrasound, lightning, and satellite data ...
Categories: Volcano Reports

AVO Great Sitkin YELLOW/ADVISORY - Unrest continues; seismicity remains elevated

Wed, 12/12/2018 - 17:33
Dec 12, 2018 22:04 - Low-level unrest continues at Great Sitkin volcano. Small earthquakes associated with the ongoing unrest continue to be recorded on the local seismic network. No eruptive activity was observed in satellite or web camera views of the volcano over the past day. No explosive activity was detected on a regional infrasound array on Adak Island. Great Sitkin volcano is monitored with a local real-time seismic network, which will typically allow AVO to detect changes in unrest that may lead to an explosive eruption. Rapid detection of an ash-producing eruption would be ...
Categories: Volcano Reports

AVO Cleveland ORANGE/WATCH - Unrest continues; small explosion at 11:53 AKST

Wed, 12/12/2018 - 17:33
Dec 12, 2018 22:04 - Low-level unrest continues at Cleveland volcano. A small explosion, detected by the local seismic network, occurred today at 20:53 UTC (11:53 AKST). Satellite views of the volcano were obscured by clouds at the time, and no ash cloud has yet been observed. No other significant activity was detected over the past day. The color code and alert level were raised to Orange/Watch. Cleveland volcano is monitored by only two seismic stations, which restricts AVO's ability to detect precursory unrest that may lead to an explosive eruption. Rapid detection of an ash-producing ...
Categories: Volcano Reports

AVO Semisopochnoi YELLOW/ADVISORY - Unrest continues; no eruptive activity observed; seismic data out

Wed, 12/12/2018 - 17:33
Dec 12, 2018 22:04 - Unrest continues at Semisopochnoi volcano. No eruptive activity was detected in regional infrasound data, or observed in mostly cloudy satellite views of the volcano, over the past day. Local seismic data remains offline. Semisopochnoi is monitored with an on-island seismic network, though this is currently off-line, and remotely by satellite and lightning sensors. Furthermore, an infrasound array on Adak Island may detect explosive emissions from Semisopochnoi with a 13 minute delay if atmospheric conditions permit.
Categories: Volcano Reports

AVO Veniaminof ORANGE/WATCH - Seismicity has declined, but remains elevated; lava effusion appears to have stopped

Wed, 12/12/2018 - 17:33
Dec 12, 2018 22:04 - Webcam and satellite imagery over the past few days suggests that effusion of lava from Veniaminof's intracaldera cone has stopped. However, many small explosive bursts were detected yesterday by the local seismic network suggesting weak activity may have been occurring at that time. These explosions were not recorded by regional infrasound sensors. No explosions have been detected since late yesterday afternoon, and the seismic tremor disappeared around the same time. However, small low-frequency seismic events continue. Veniaminof volcano is monitored with a local ...
Categories: Volcano Reports

AVO Cleveland ORANGE/WATCH - Small explosion detected at 11:53 AKST; Alert level raised to ORANGE/WATCH.

Wed, 12/12/2018 - 15:33
Dec 12, 2018 21:21 - Local seismic sensors recorded a small explosion today at 20:53 UTC (11:53 AKST). No ash cloud has yet been detected in satellite imagery. No other significant activity was detected. Explosions from Cleveland typically produce relatively small volcanic ash clouds that dissipate within hours; however, more significant ash emissions are possible. Cleveland volcano is monitored with a limited real-time seismic network, which inhibits AVO's ability to detect precursory unrest that may lead to an explosive eruption. Rapid detection of an ash-producing eruption may be ...
Categories: Volcano Reports

AVO Great Sitkin YELLOW/ADVISORY - Unrest continues with elevated seismicity; small explosion at 6:05 AKDT

Tue, 12/11/2018 - 16:32
Dec 11, 2018 21:30 - Low-level unrest continues at Great Sitkin volcano. Small earthquakes associated with the ongoing unrest continue to be recorded on the local seismic network. In addition, a small seismic swarm lasting for about 4 hours occurred overnight. This was followed a few hours later, at about 6:05 AM this morning, by a small explosion, which was detected seismically. The explosion was not recorded by the nearby infrasound array on Adak Island, and no eruption cloud was observed in satellite data. Great Sitkin volcano is monitored with a local real-time seismic network, which ...
Categories: Volcano Reports

AVO Cleveland YELLOW/ADVISORY - Unrest continues; no activity in geophysical data; thermal anomaly in satellite data

Tue, 12/11/2018 - 16:32
Dec 11, 2018 21:30 - Low-level unrest continues at Cleveland volcano. No significant activity has been detected in seismic or regional infrasound data over the past day. Elevated surface temperatures were observed at the volcano's summit in partly cloudy to mostly clear satellite views. Cleveland volcano is monitored by only two seismic stations, which restricts AVO's ability to detect precursory unrest that may lead to an explosive eruption. Rapid detection of an ash-producing eruption may be possible using a combination of seismic, infrasound, lightning, and satellite data. The web ...
Categories: Volcano Reports

AVO Semisopochnoi YELLOW/ADVISORY - Unrest continues; no eruptive activity observed; seismic data out

Tue, 12/11/2018 - 16:32
Dec 11, 2018 21:30 - Unrest continues at Semisopochnoi volcano. No eruptive activity was detected in regional infrasound data, or observed in mostly cloudy satellite views of the volcano, over the past day. Local seismic data remains offline. Semisopochnoi is monitored with an on-island seismic network, though this is currently off-line, and remotely by satellite and lightning sensors. Furthermore, an infrasound array on Adak Island may detect explosive emissions from Semisopochnoi with a 13 minute delay if atmospheric conditions permit.
Categories: Volcano Reports

AVO Veniaminof ORANGE/WATCH - Unrest continues with elevated seismicity; minor ash emissions possible

Tue, 12/11/2018 - 16:32
Dec 11, 2018 21:30 - Veniaminof volcano continues to exhibit unrest characterized over the past day by elevated seismic activity. However, no clear signs of eruptive activity were observed in webcam images over the past day, and it is uncertain if lava continues to erupt from the intracaldera cone, although weak activity could be occurring. No acoustic signals have been recorded by regional infrasound sensors over the past 24 hours, and satellite views of the volcano have been obscured by clouds. Veniaminof volcano is monitored with a local real-time seismic network, which will typically ...
Categories: Volcano Reports

HVO Kilauea YELLOW/ADVISORY - Low activity levels across the volcano, no lava at the surface.

Tue, 12/11/2018 - 14:32
Dec 11, 2018 19:56 - Activity Summary: Kīlauea Volcano is not erupting. Rates of seismicity, deformation, and gas release have not changed significantly over the past week. Deformation signals are consistent with refilling of the middle East Rift Zone. Observations: HVO monitoring during the past week showed no significant changes. Geologic web cams observed gusty winds lofting and remobilizing some of the ash at the summit of Kīlauea. Low rates of seismicity at the summit and East Rift Zone (ERZ) continue, with events occurring primarily at Kīlauea's summit and south flank areas. In ...
Categories: Volcano Reports

AVO Great Sitkin YELLOW/ADVISORY - Unrest continues with elevated seismicity; no eruptive activity detected

Mon, 12/10/2018 - 15:31
Dec 10, 2018 21:19 - Low-level unrest continues at Great Sitkin volcano. Small earthquakes associated with the ongoing unrest continue to be recorded on the local seismic network. No eruptive activity was observed in satellite or web camera views of the volcano over the past day. No explosive activity was detected on a regional infrasound array on Adak Island. Great Sitkin volcano is monitored with a local real-time seismic network, which will typically allow AVO to detect changes in unrest that may lead to an explosive eruption. Rapid detection of an ash-producing eruption would be ...
Categories: Volcano Reports

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