USGS Volcano Current Alerts

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Recent Volcano Updates from the U.S. Geological Survey Volcano Hazards Program
Updated: 11 min 20 sec ago

AVO Great Sitkin YELLOW/ADVISORY - Low-level unrest continues. No activity observed in satellite data.

Mon, 10/15/2018 - 18:32
Oct 15, 2018 20:50 - Low-level unrest continues at Great Sitkin volcano. Seismicity remains above background levels. No activity was observed in regional infrasound data or in mostly cloudy satellite images during the past day. 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 accomplished using a combination of seismic, infrasound, lightning, and satellite data.
Categories: Volcano Reports

AVO Cleveland YELLOW/ADVISORY - Unrest continues. No activity observed in monitoring data.

Mon, 10/15/2018 - 18:32
Oct 15, 2018 20:50 - Low-level unrest continues at Cleveland volcano. Nothing significant has been detected in seismic and regional infrasound data. No activity observed in cloudy satellite views of the volcano over the past day. 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 local infrasound array ...
Categories: Volcano Reports

AVO Semisopochnoi YELLOW/ADVISORY - Seismic unrest continues. No activity in cloudy satellite data.

Mon, 10/15/2018 - 18:32
Oct 15, 2018 20:50 - Unrest continues at Semisopochnoi volcano. Seismicity remains elevated and above background levels. No significant volcanic activity was observed in cloudy satellite data or detected by regional infrasound sensors over the past day. Semisopochnoi is monitored with an on-island seismic network, and remotely by satellite and lightning sensors. 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.No activity in cloudy satellite data.

Mon, 10/15/2018 - 18:32
Oct 15, 2018 20:50 - Unrest continues at Veniaminof volcano. Seismicity is above background levels and is characterized by low-level continuous tremor. Satellite and web camera views of the volcano have been obscured by clouds. No significant ash emissions have been observed or reported. 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 an explosive eruption. Rapid detection of an ash-producing eruption would be accomplished using a combination of seismic, infrasound, lightning, and satellite ...
Categories: Volcano Reports

AVO Great Sitkin YELLOW/ADVISORY - Low-level unrest continues. No activity observed in satellite data.

Sun, 10/14/2018 - 17:32
Oct 14, 2018 22:02 - Low-level unrest continues at Great Sitkin volcano. Seismicity remains above background levels. No activity was observed in regional infrasound data or in mostly cloudy satellite images during the past day. 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 accomplished using a combination of seismic, infrasound, lightning, and satellite data.
Categories: Volcano Reports

AVO Cleveland YELLOW/ADVISORY - Unrest continues. No activity observed in monitoring data.

Sun, 10/14/2018 - 17:32
Oct 14, 2018 22:02 - Low-level unrest continues at Cleveland volcano. Nothing significant has been detected in seismic and regional infrasound data. No activity observed in cloudy satellite views of the volcano over the past day. 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 local infrasound array ...
Categories: Volcano Reports

AVO Semisopochnoi YELLOW/ADVISORY - Seismic unrest continues. No activity in cloudy satellite data.

Sun, 10/14/2018 - 17:32
Oct 14, 2018 22:02 - Unrest continues at Semisopochnoi volcano. Seismicity remains elevated and above background levels. No significant volcanic activity was observed in cloudy satellite data or detected by regional infrasound sensors over the past day. Semisopochnoi is monitored with an on-island seismic network, and remotely by satellite and lightning sensors. 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. Elevated surface temps in cloudy satellite data. Tremor continues.

Sun, 10/14/2018 - 17:32
Oct 14, 2018 22:02 - Unrest continues at Veniaminof volcano. Seismicity is above background levels and is characterized by low-level continuous tremor. Elevated surface temperatures associated with the lava flow at the intracaldera cone were observed in a single, cloudy satellite image over the past day. Web camera views of the volcano have been obscured by clouds. No significant ash emissions have been observed or reported. 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 an explosive ...
Categories: Volcano Reports

AVO Great Sitkin YELLOW/ADVISORY - Swarm of small earthquakes overnight. No activity observed in satellite data.

Sat, 10/13/2018 - 17:32
Oct 13, 2018 21:30 - Low-level unrest continues at Great Sitkin volcano. A swarm of small earthquakes occurred overnight at the volcano but ended by this morning. No activity was observed in regional infrasound data or in mostly cloudy satellite images during the past day. 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 accomplished using a combination of seismic, infrasound, lightning, and satellite data.
Categories: Volcano Reports

AVO Cleveland YELLOW/ADVISORY - Unrest continues. No activity observed in monitoring data.

Sat, 10/13/2018 - 17:32
Oct 13, 2018 21:30 - Low-level unrest continues at Cleveland volcano. Nothing significant has been detected in seismic and regional infrasound data. No activity observed in partly cloudy to cloudy satellite views of the volcano over the past day. 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 local ...
Categories: Volcano Reports

AVO Semisopochnoi YELLOW/ADVISORY - Seismic unrest continues. Nothing seen in cloudy satellite data.

Sat, 10/13/2018 - 17:32
Oct 13, 2018 21:30 - Unrest continues at Semisopochnoi volcano. Seismicity remains elevated and above background levels. No significant volcanic activity was observed in cloudy satellite data or detected by regional infrasound sensors over the past day. Semisopochnoi is monitored with an on-island seismic network, and remotely by satellite and lightning sensors. 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. Elevated surface temps in satellite data. Seismic tremor continues.

Sat, 10/13/2018 - 17:32
Oct 13, 2018 21:30 - Unrest continues at Veniaminof volcano. Seismicity is above background levels and is characterized by low-level continuous tremor. Elevated surface temperatures associated with the lava flow at the intracaldera cone were observed in multiple satellite images over the past day. Web camera views of the volcano have been obscured by clouds. No significant ash emissions have been observed or reported. 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 an explosive eruption. ...
Categories: Volcano Reports

AVO Great Sitkin YELLOW/ADVISORY - Low-level unrest continues. Seismic activity slightly elevated.

Fri, 10/12/2018 - 20:32
Oct 12, 2018 22:52 - Low-level unrest continues at Great Sitkin Volcano. Seismicity remains elevated with small earthquakes occurring at rates above background levels. No activity was observed in partly cloudy to mostly cloudy satellite images or regional infrasound data over the past week. 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 accomplished using a combination of seismic, infrasound, lightning, and ...
Categories: Volcano Reports

AVO Cleveland YELLOW/ADVISORY - Unrest continues. Seismicity low.

Fri, 10/12/2018 - 20:32
Oct 12, 2018 22:52 - Nothing significant was detected in seismic or infrasound (pressure) sensor data this week. No activity was observed in partly cloudy to mostly satellite views of the volcano throughout the week. Future explosive activity is likely and is expected to occur without warning. Previous explosions have produced hazardous conditions primarily near the volcano, but occasionally they have been large enough to produce a drifting ash cloud. Cleveland volcano is monitored by only two seismic stations, which restricts AVO's ability to detect precursory unrest that may lead to ...
Categories: Volcano Reports

AVO Semisopochnoi YELLOW/ADVISORY - Semisopochnoi lowered to YELLOW/ADVISORY today. Elevated seismicity continues.

Fri, 10/12/2018 - 20:32
Oct 12, 2018 22:52 - Unrest continues at Semisopochnoi volcano. Earlier today, AVO lowered the Aviation Color Code/Volcano Alert Level for Semisopochnoi to YELLOW/ADVISORY based on recent satellite and seismic observations indicating no eruptive activity since October 1. However, discrete earthquake activity has remained above background levels throughout the week. 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 monitored with an on-island seismic ...
Categories: Volcano Reports

AVO Veniaminof ORANGE/WATCH - Eruption continues; minor ash emissions, and lava flow still active.

Fri, 10/12/2018 - 20:32
Oct 12, 2018 22:52 - Low-level eruptive activity continues at the intracaldera cone of Veniaminof volcano. Analysis of recent satellite data indicates the eastern part of the lava flow field on the south flank of the intracaldera cone remains active. Relatively continuous seismic tremor has been occurring throughout the week, further indicating that effusion of lava is continuing. Views of the volcano from the FAA web camera in Perryville recorded ash and incandescence on October 6, incandescence on October 7, and a plume on October 8. However, since October 8, clouds have obscured views of ...
Categories: Volcano Reports

AVO Semisopochnoi YELLOW/ADVISORY - Satellite observations and lack of seismic tremor indicate eruption has paused.

Fri, 10/12/2018 - 15:33
Oct 12, 2018 19:45 - Recent satellite observations and a lack of seismic tremor over the past week indicate eruptive activity at Semisopochnoi has paused. Thus we are lowering the Aviation Color Code to YELLOW and the Volcano Alert Level to ADVISORY. Although seismic tremor is currently absent at Semisopochnoi, discrete earthquake activity remains above background levels. Pauses in eruptive activity lasting for weeks to months are known to occur during volcanic eruptions. A return to eruptive activity remains a possibility at Semisopochnoi that could occur with little or no warning. AVO ...
Categories: Volcano Reports

AVO Great Sitkin YELLOW/ADVISORY - Seismic unrest continues. No activity observed in satellite data.

Fri, 10/12/2018 - 15:33
Oct 11, 2018 21:53 - Low-level unrest continues at Great Sitkin volcano. Seismic activity remains above background. No activity was observed in regional infrasound data or in mostly cloudy satellite images during the past day. 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 accomplished using a combination of seismic, infrasound, lightning, and satellite data.
Categories: Volcano Reports

AVO Cleveland YELLOW/ADVISORY - Unrest continues. No activity observed in satellite data.

Fri, 10/12/2018 - 15:33
Oct 11, 2018 21:53 - Low-level unrest continues at Cleveland volcano. Nothing significant has been detected in seismic and regional infrasound data. No activity observed in mostly cloudy satellite views of the volcano over the past day. 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 local infrasound ...
Categories: Volcano Reports

AVO Veniaminof ORANGE/WATCH - Unrest continues. Elevated surface temps in satellite data. Lava flow still active.

Fri, 10/12/2018 - 15:33
Oct 11, 2018 21:53 - Unrest continues at Veniaminof volcano. Seismicity is above background levels and is characterized by low-level continuous tremor. Elevated surface temperatures associated with the lava flow at the intracaldera cone were observed in two mostly cloudy satellite images over the past day. Analysis of recent satellite data indicates the eastern part of the lava flow field on the south flank of Veniaminof remains active. Web camera views of the volcano have been obscured by clouds. No significant ash emissions have been observed or reported. Veniaminof Volcano is monitored ...
Categories: Volcano Reports

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