Volcano Reports

HVO Mauna Loa YELLOW/ADVISORY - Mauna Loa is not erupting. Seismicity above background; continued summit inflation.

USGS Volcano Current Alerts - Thu, 09/19/2019 - 16:30
Sep 19, 2019 20:08 - Activity Summary: Mauna Loa Volcano is not erupting. Rates of deformation and seismicity have not changed significantly in the past week and persist above long-term background levels. Observations: During the past week, approximately 90 small-magnitude earthquakes (all smaller than M2.5) were detected beneath the upper elevations of Mauna Loa. Most of the earthquakes occurred at shallow to intermediate depths of less than 10 km (~6 miles) below ground level. Global Positioning System (GPS) and Interferometric Synthetic Aperture Radar (InSAR) measurements show ...
Categories: Volcano Reports

AVO Semisopochnoi YELLOW/ADVISORY - Unrest continues; satellite data obscured by clouds. Seismicity is low.

USGS Volcano Current Alerts - Thu, 09/19/2019 - 16:30
Sep 19, 2019 19:32 - No significant activity was observed in the seismic data. No explosions were detected in regional infrasound data. Satellite observations were obscured by clouds 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 slight delay (approximately 13 minutes) if atmospheric conditions permit.
Categories: Volcano Reports

AVO Cleveland YELLOW/ADVISORY - Unrest continues; satellite data obscured by clouds. Seismicity is low.

USGS Volcano Current Alerts - Thu, 09/19/2019 - 16:30
Sep 19, 2019 19:32 - Unrest continues. Satellite views were obscured by clouds. Local seismic data show no new activity. No activity observed in local or infrasound arrays during the last 24 hours. Episodes of lava effusion and explosions can occur without advance warning. Explosions from Cleveland are normally short duration and only present a hazard to aviation in the immediate vicinity of the volcano. Larger explosions that present a more widespread hazard to aviation are possible, but are less likely and occur less frequently. Cleveland volcano is monitored by only two seismic ...
Categories: Volcano Reports

AVO Shishaldin ORANGE/WATCH - Low-level eruption continues;

USGS Volcano Current Alerts - Thu, 09/19/2019 - 16:30
Sep 19, 2019 19:32 - Low-level eruptive activity continues at Shishaldin volcano. Seismicity remains elevated with tremor detected over the past day. Satellite and web camera images were obscured by clouds over the past day. Shishaldin is monitored by local seismic and infrasound sensors, satellite data, a web camera, a telemetered geodetic network, and distant infrasound and lightning networks.
Categories: Volcano Reports

AVO Cleveland YELLOW/ADVISORY - Unrest continues; satellite data obscured by clouds. Seismicity is low.

USGS Volcano Current Alerts - Wed, 09/18/2019 - 17:30
Sep 18, 2019 21:23 - Unrest continues. Satellite views were obscured by clouds. Local seismic data show no new activity. No activity observed in local or infrasound arrays during the last 24 hours. Episodes of lava effusion and explosions can occur without advance warning. Explosions from Cleveland are normally short duration and only present a hazard to aviation in the immediate vicinity of the volcano. Larger explosions that present a more widespread hazard to aviation are possible, but are less likely and occur less frequently. Cleveland volcano is monitored by only two seismic ...
Categories: Volcano Reports

AVO Semisopochnoi YELLOW/ADVISORY - Seismic activity decreased; color code/activity level lowered to YELLOW/ADVISORY

USGS Volcano Current Alerts - Wed, 09/18/2019 - 17:30
Sep 18, 2019 21:23 - No significant activity was observed in the seismic data. No explosions were detected in regional infrasound data. Satellite observations were obscured by clouds over the past day. Low-level sulfur dioxide emissions continue to be observed when conditions permit. AVO has lowered the color code/activity level to YELLOW/ADVISORY. 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 slight delay (approximately 13 minutes) ...
Categories: Volcano Reports

AVO Shishaldin ORANGE/WATCH - Low-level eruption continues;

USGS Volcano Current Alerts - Wed, 09/18/2019 - 17:30
Sep 18, 2019 21:23 - Low-level eruptive activity continues at Shishaldin volcano. Seismicity remains elevated with tremor detected over the past day. Satellite and web camera images were obscured by clouds over the past day. Shishaldin is monitored by local seismic and infrasound sensors, satellite data, a web camera, a telemetered geodetic network, and distant infrasound and lightning networks.
Categories: Volcano Reports

AVO Cleveland YELLOW/ADVISORY - Unrest continues; satellite data obsured by clouds. Seismicity is low.

USGS Volcano Current Alerts - Tue, 09/17/2019 - 17:30
Sep 17, 2019 20:36 - Unrest continues. Satellite views were obscured by clouds. Local seismic data remains out but no activity was detected by regional seismic data or infrasound arrays during the last 24 hours. Episodes of lava effusion and explosions can occur without advance warning. Explosions from Cleveland are normally short duration and only present a hazard to aviation in the immediate vicinity of the volcano. Larger explosions that present a more widespread hazard to aviation are possible, but are less likely and occur less frequently. Cleveland volcano is monitored by only two ...
Categories: Volcano Reports

AVO Semisopochnoi ORANGE/WATCH - Unrest continues; no activity observed in satellite or seismic data

USGS Volcano Current Alerts - Tue, 09/17/2019 - 17:30
Sep 17, 2019 20:36 - The seismic data outage has ended and local data are available. No significant activity was observed in the seismic data. No explosions were detected in regional infrasound data. Satellite observations were obscured by clouds over the past day. Eruptive activity may have paused. 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 slight delay (approximately 13 minutes) if atmospheric conditions permit.
Categories: Volcano Reports

AVO Shishaldin ORANGE/WATCH - Low-level eruption continues;

USGS Volcano Current Alerts - Tue, 09/17/2019 - 17:30
Sep 17, 2019 20:36 - Low-level eruptive activity continues at Shishaldin volcano. Seismicity remains elevated with tremor detected over the past day. Satellite and web camera images were obscured by clouds over the past day. Shishaldin is monitored by local seismic and infrasound sensors, satellite data, a web camera, a telemetered geodetic network, and distant infrasound and lightning networks.
Categories: Volcano Reports

AVO Cleveland YELLOW/ADVISORY - Unrest continues; satellite observations show elevated temperatures.

USGS Volcano Current Alerts - Mon, 09/16/2019 - 18:30
Sep 16, 2019 20:58 - Unrest continues. Satellite observations show elevated surface temperatures in the summit crater. Local seismic data is out but no activity was detected by regional seismic data or infrasound arrays during the last 24 hours. Episodes of lava effusion and explosions can occur without advance warning. Explosions from Cleveland are normally short duration and only present a hazard to aviation in the immediate vicinity of the volcano. Larger explosions that present a more widespread hazard to aviation are possible, but are less likely and occur less ...
Categories: Volcano Reports

AVO Semisopochnoi ORANGE/WATCH - Seismicity remains elevated.

USGS Volcano Current Alerts - Mon, 09/16/2019 - 18:30
Sep 16, 2019 20:58 - Seismic data are currently not available, however seismic activity the past day prior to the outage was slightly elevated with low-frequency earthquakes. No explosions were detected in regional infrasound data. Satellite observations were mostly obscured by clouds over the past day. Eruptive activity may have paused. 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 slight delay (approximately 13 minutes) if ...
Categories: Volcano Reports

AVO Shishaldin ORANGE/WATCH - Low-level eruption continues; elevated surface temperatures observed in satellite

USGS Volcano Current Alerts - Mon, 09/16/2019 - 18:30
Sep 16, 2019 20:58 - Low-level eruptive activity continues at Shishaldin volcano. Seismicity remains elevated with tremor detected over the past day. Satellite images show elevated surface temperatures in the summit crater during brief periods of clear weather. Web camera observations during periods of clear weather show possible steam emissions. Shishaldin is monitored by local seismic and infrasound sensors, satellite data, a web camera, a telemetered geodetic network, and distant infrasound and lightning networks.
Categories: Volcano Reports

AVO Cleveland YELLOW/ADVISORY - Unrest continues; satellite observations show elevated temperatures.

USGS Volcano Current Alerts - Sun, 09/15/2019 - 15:30
Sep 15, 2019 20:03 - Unrest continues. Satellite observations show highly elevated surface temperatures in the summit crater during periods of clear weather. Local seismic data is out but no activity was detected by regional seismic data or infrasound arrays during the last 24 hours. Episodes of lava effusion and explosions can occur without advance warning. Explosions from Cleveland are normally short duration and only present a hazard to aviation in the immediate vicinity of the volcano. Larger explosions that present a more widespread hazard to aviation are possible, but are less likely ...
Categories: Volcano Reports

AVO Semisopochnoi ORANGE/WATCH - Seismicity remains elevated.

USGS Volcano Current Alerts - Sun, 09/15/2019 - 15:30
Sep 15, 2019 20:03 - Seismic activity over the past day remains elevated with low-frequency earthquakes and there were no explosions detected in regional infrasound data. Satellite observations were mostly obscured by clouds over the past day. Eruptive activity may have paused. 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 slight delay (approximately 13 minutes) if atmospheric conditions permit.
Categories: Volcano Reports

AVO Shishaldin ORANGE/WATCH - Low-level eruption continues; elevated surface temperatures observed in satellite

USGS Volcano Current Alerts - Sun, 09/15/2019 - 15:30
Sep 15, 2019 20:03 - Low-level eruptive activity continues at Shishaldin volcano. Seismicity remains elevated with tremor detected over the past day. Satellite images show elevated surface temperatures in the summit crater during brief periods of clear weather. Web camera observations during periods of clear weather show no activity. Shishaldin is monitored by local seismic and infrasound sensors, satellite data, a web camera, a telemetered geodetic network, and distant infrasound and lightning networks.
Categories: Volcano Reports

AVO Cleveland YELLOW/ADVISORY - Unrest continues; satellite observations obscured by clouds.

USGS Volcano Current Alerts - Sat, 09/14/2019 - 15:30
Sep 14, 2019 19:37 - Satellite observations were obscured by clouds over the past day. Local seismic data is out but no activity was detected by regional seismic data or infrasound arrays during the last 24 hours. Episodes of lava effusion and explosions can occur without advance warning. Explosions from Cleveland are normally short duration and only present a hazard to aviation in the immediate vicinity of the volcano. Larger explosions that present a more widespread hazard to aviation are possible, but are less likely and occur less frequently. Cleveland volcano is monitored by only ...
Categories: Volcano Reports

AVO Semisopochnoi ORANGE/WATCH - Seismicity remains elevated.

USGS Volcano Current Alerts - Sat, 09/14/2019 - 15:30
Sep 14, 2019 19:37 - Seismic activity over the past day remains elevated with low-frequency earthquakes and there were no explosions detected in regional infrasound data. Satellite observations were mostly obscured by clouds over the past day, but high resolution images from earlier in the week suggest that eruptive activity may have paused. 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 slight delay (approximately 13 minutes) if ...
Categories: Volcano Reports

AVO Shishaldin ORANGE/WATCH - Low-level eruption continues; elevated surface temperatures observed in satellite

USGS Volcano Current Alerts - Sat, 09/14/2019 - 15:30
Sep 14, 2019 19:37 - Low-level eruptive activity continues at Shishaldin volcano. Seismicity remains elevated with tremor detected over the past day. Satellite images show elevated surface temperatures in the summit crater during brief periods of clear weather. Web camera observations during brief periods of clear weather so minimal to no steam emissions. Shishaldin is monitored by local seismic and infrasound sensors, satellite data, a web camera, a telemetered geodetic network, and distant infrasound and lightning networks.
Categories: Volcano Reports

AVO Cleveland YELLOW/ADVISORY - Unrest continues; elevated temperatures and steaming seen in satellite images

USGS Volcano Current Alerts - Fri, 09/13/2019 - 16:30
Sep 13, 2019 20:09 - Satellite observations during brief periods of clear weather over the last week showed the typical elevated surface temperatures in the summit crater and minor steam emissions. No ash emissions were observed. Seismicity was quiet before a local network outage began on September 2. There was nothing significant noted in local or regional infrasound or seismic data during the week. Additional episodes of lava effusion and explosions are likely and will occur without advance warning. The most recent explosion of Cleveland occurred on January 9, 2019. These explosions are ...
Categories: Volcano Reports

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