Volcano Reports

AVO Shishaldin YELLOW/ADVISORY - Elevated surface temperatures from summit crater; no eruptive activity observed.

USGS Volcano Current Alerts - 4 hours 36 min ago
Jul 21, 2019 20:17 - Elevated surface temperatures were observed in multiple satellite images over the past 24 hours accompanied by periods of weak seismic tremor. No eruptive activity was detected in infrasound data and cloudy conditions obscured web camera views of the volcano. 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 - No eruptive activity observed in satellite or seismic data in the past day.

USGS Volcano Current Alerts - 4 hours 36 min ago
Jul 21, 2019 20:17 - Elevated surface temperatures at the summit of the volcano were observed in multiple satellite images over the last 24 hours. No activity was detected in regional seismic or infrasound data. Additional episodes of lava effusion and explosions are likely and will 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. Local seismic ...
Categories: Volcano Reports

AVO Semisopochnoi ORANGE/WATCH - Low-level plume in satellite data persists; no ash or other eruptive activity seen

USGS Volcano Current Alerts - 4 hours 36 min ago
Jul 21, 2019 20:17 - Seismic activity levels have remained low following the short-lived eruption on Thursday. A low-level plume continues to be observed in satellite images and extends tens of miles from the volcano, although no ash signals have been detected. Given these observations, it remains possible that activity could increase rapidly with little warning. Semisopochnoi is monitored with an on-island seismic network 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 ...
Categories: Volcano Reports

AVO Shishaldin YELLOW/ADVISORY - Elevated surface temperatures from summit crater; no eruptive activity observed.

USGS Volcano Current Alerts - Sat, 07/20/2019 - 15:30
Jul 20, 2019 19:47 - Elevated surface temperatures were observed in multiple satellite images over the past 24 hours accompanied by periods of weak seismic tremor. No eruptive activity was detected in infrasound data and cloudy conditions obscured web camera views of the volcano. 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 - No eruptive activity observed in satellite or seismic data in the past day.

USGS Volcano Current Alerts - Sat, 07/20/2019 - 15:30
Jul 20, 2019 19:47 - Elevated surface temperatures at the summit of the volcano were observed in multiple satellite images over the last 24 hours. No activity was detected in regional seismic or infrasound data. Additional episodes of lava effusion and explosions are likely and will 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. Local seismic ...
Categories: Volcano Reports

AVO Semisopochnoi ORANGE/WATCH - Seismic activity levels remain low; no eruptive activity detected

USGS Volcano Current Alerts - Sat, 07/20/2019 - 15:30
Jul 20, 2019 19:47 - Seismic activity levels have stayed low over the past 24 hours following the short-lived eruption on Thursday. A possible low-level gas plume extending tens of miles from the volcano was noted in partially cloudy satellite images today. No ash signals have been detected. Semisopochnoi is monitored with an on-island seismic network 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

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

USGS Volcano Current Alerts - Fri, 07/19/2019 - 18:30
Jul 19, 2019 23:04 - 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, with a few small earthquakes located at Mount St. Helens, Mount Rainier, Mount Hood, Newberry and Three Sisters. The ...
Categories: Volcano Reports

HVO Mauna Loa YELLOW/ADVISORY - Mauna Loa is not erupting. Deformation and seismicity rates remain slightly elevated.

USGS Volcano Current Alerts - Thu, 07/18/2019 - 22:30
Jul 19, 2019 01:47 - Activity Summary: Mauna Loa Volcano is not erupting. Rates of deformation and seismicity remained slightly elevated over the past week. Observations: During the past week, approximately 43 small-magnitude earthquakes (most less than M2.0) occurred beneath the summit and upper Southwest Rift Zone, compared to ~80 earthquakes in this region the week before. Most earthquakes occurred at depths of less than 5 km (3 miles). Global Positioning System (GPS) and Interferometric Synthetic Aperture Radar (InSAR) measurements show continued summit inflation, suggestive of ...
Categories: Volcano Reports

AVO Shishaldin YELLOW/ADVISORY - Elevated surface temperatures from summit crater; no eruptive activity observed.

USGS Volcano Current Alerts - Thu, 07/18/2019 - 20:30
Jul 18, 2019 21:47 - Elevated surface temperatures were observed in multiple satellite images over the past 24 hours accompanied by periods of weak seismic tremor. No eruptive activity was detected in infrasound data and cloudy conditions obscured web camera views of the volcano. 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 - No eruptive activity observed in satellite or seismic data in the past day.

USGS Volcano Current Alerts - Thu, 07/18/2019 - 20:30
Jul 18, 2019 21:47 - Elevated surface temperatures were observed at the summit of the volcano in mostly cloudy satellite views over the last 24 hours. No activity was detected in regional seismic or infrasound data. Additional episodes of lava effusion and explosions are likely and will 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. Local ...
Categories: Volcano Reports

AVO Semisopochnoi ORANGE/WATCH - Seismic activity increased; color code/activity level raised to ORANGE/WATCH

USGS Volcano Current Alerts - Thu, 07/18/2019 - 20:30
Jul 18, 2019 21:47 - Seismic activity levels have continued to increase at Semisopochnoi, prompting a change in the color code/activity level to ORANGE/WATCH. An strong burst of tremor overnight at 07:39 UTC / 23:39 AKDT generated an airwave detected on the Adak array 260 km (161 miles) to the east. A low-level plume has been observed intermittently in mostly cloudy satellite images over the past 24 hours. It extended west-southwest from the area of the Cerberus vent up to 80 km (50 miles); however, no ash signatures have been detected. The meteorological cloud deck has been around 10,000' ...
Categories: Volcano Reports

AVO Semisopochnoi ORANGE/WATCH - Seismic activity increased; color code/activity level raised to ORANGE/WATCH

USGS Volcano Current Alerts - Thu, 07/18/2019 - 15:30
Jul 18, 2019 18:38 - Elevated seismicity that began yesterday has increased overnight. A stronger tremor signal recorded at 23:39 AKDT / 07:39 UTC also produced an infrasound signal on an infrasound array 260 km (161 miles) east on Adak island. This event likely produced ash emissions, and at the current level of continued unrest similar events could occur with little to no warning. The meteorological cloud deck has been around 10,000' (3000 m) asl over Semisopochnoi and no ash signals have been detected above this height. A small plume extending 18 km (11 miles) from the Cerberus vent was ...
Categories: Volcano Reports

AVO Shishaldin YELLOW/ADVISORY - Seismic tremor ongoing; no eruptive activity observed in the past day.

USGS Volcano Current Alerts - Wed, 07/17/2019 - 14:30
Jul 17, 2019 19:27 - Some seismic tremor has continued over the last 24 hours. No eruptive activity was detected in infrasound data and and cloudy conditions obscured satellite and web camera views of the volcano. 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 - No eruptive activity observed in satellite or seismic data in the past day.

USGS Volcano Current Alerts - Wed, 07/17/2019 - 14:30
Jul 17, 2019 19:27 - Weakly elevated surface temperatures were observed at the summit of the volcano in partly cloudy satellite views over the last 24 hours. No activity was detected in regional seismic or infrasound data. Additional episodes of lava effusion and explosions are likely and will 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 YELLOW/ADVISORY - Small explosion detected yesterday in seismic and infrasound data.

USGS Volcano Current Alerts - Wed, 07/17/2019 - 14:30
Jul 17, 2019 19:27 - Local seismic sensors and regional infrasound sensors detected a signal yesterday likely generated by a small explosion from Semisopochnoi. No significant ash emissions are expected from events of this size, and no ash signals have been observed in cloudy satellite images. Seismic tremor, fluctuating between periods of continuous activity and discrete bursts, continued over the last 24 hours. Semisopochnoi is monitored with an on-island seismic network and remotely by satellite and lightning sensors. Furthermore, an infrasound array on Adak Island may detect explosive ...
Categories: Volcano Reports

HVO Kilauea GREEN/NORMAL - Low activity levels; no lava at the surface, slow inflation of summit and middle ERZ.

USGS Volcano Current Alerts - Tue, 07/16/2019 - 18:30
Jul 16, 2019 22:37 - Activity Summary: Kīlauea Volcano is not erupting. Monitoring data continue to show steady rates of seismicity and ground deformation, low rates of sulfur dioxide emission, and only minor geologic changes since the end of eruptive activity in September 2018. As of June 25, Kīlauea Volcano has been at NORMAL/GREEN. For definitions of USGS Volcano Alert Levels and Aviation Color Codes, see: https://volcanoes.usgs.gov/vhp/about_alerts.html. PLEASE NOTE: Reflecting the current Kilauea Volcano Alert Level, HVO will transition from weekly to monthly text updates for ...
Categories: Volcano Reports

AVO Shishaldin YELLOW/ADVISORY - Seismic tremor ongoing; no eruptive activity observed in the past day.

USGS Volcano Current Alerts - Tue, 07/16/2019 - 15:30
Jul 16, 2019 19:51 - Seismic tremor has continued over the last 24 hours. No eruptive activity was detected in infrasound data and and cloudy conditions obscured satellite and web camera views of the volcano. 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 - No eruptive activity observed in satellite or seismic data in the past day.

USGS Volcano Current Alerts - Tue, 07/16/2019 - 15:30
Jul 16, 2019 19:51 - Weakly elevated surface temperatures were observed at the summit of the volcano in partly clear satellite views over the last 24 hours. No activity was detected in regional seismic or infrasound data. Additional episodes of lava effusion and explosions are likely and will 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 YELLOW/ADVISORY - Seismic tremor ongoing; no eruptive activity observed in the past day.

USGS Volcano Current Alerts - Tue, 07/16/2019 - 15:30
Jul 16, 2019 19:51 - Seismic tremor, fluctuating between periods of continuous activity and discrete bursts, was observed over the last 24 hours. No eruptive activity was detected in infrasound data and cloudy conditions obscured satellite views of the volcano. Semisopochnoi is monitored with an on-island seismic network 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 Cleveland YELLOW/ADVISORY - No eruptive activity observed in satellite or seismic data in the past day.

USGS Volcano Current Alerts - Mon, 07/15/2019 - 18:30
Jul 15, 2019 20:03 - Nothing significant was observed in cloudy satellite views of the volcano over the last 24 hours. No activity was detected in regional seismic or infrasound data. Additional episodes of lava effusion and explosions are likely and will 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. Local seismic and infrasound data at ...
Categories: Volcano Reports

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