Sunday, May 6, 2012 2:38 PM PDT (Sunday, May 6, 2012 21:38 UTC)
Monitored CALIFORNIA VOLCANOES Current Volcano Alert Level: all NORMAL Current Aviation Color Code: all GREEN
Activity Update: All volcanoes monitored by CalVO's telemetered, real-time sensor networks exhibit normal levels of background seismicity and deformation. Real-time monitoring networks are in place at Mount Shasta, Medicine Lake Volcano, Clear Lake Volcanic Field, Lassen Volcanic Center, Long Valley Caldera and Mono-Inyo Chain.
Observations for April 1, 2012 (00:00 PDT) through April 30, 2012 (11:59 PDT): Mt Shasta: Two earthquakes under the SE flank; both M<2.0. Medicine Lake: Six M<2.0 earthquakes under the caldera. Lassen Volcanic Center: No earthquakes of M=1.0 or greater were detected. Clear Lake Volcanic Field: Five earthquakes within the southeast arm of Clear Lake. All events were below magnitude 2.0 [Note: Typical high level of seismicity observed under the Geysers steam field located outside the eastern margin of CLVF. Largest event was M=2.8]. Long Valley Caldera and Mono-Inyo Chain: Twenty-one earthquakes occurred in Long Valley Caldera east of Mammoth Lakes near Lake Crowley (largest four with M=2.1 to 2.6); Two earthquakes east of Mono Lake (M<2.0); Two earthquakes under Mammoth Mountain (both M<2.0). [Note: Typical high level of seismicity observed south of the caldera in the Sierra Nevada range. Largest event was M=2.3].
The U.S. Geological Survey will continue to monitor these volcanoes closely and will issue additional updates and changes in alert level as warranted. For a definition of alert levels see http://volcanoes.usgs.gov/activity/alertsystem/icons.php.
As part of the U.S. Geological Survey's Volcano Hazards Program, the California Volcano Observatory aims to advance scientific understanding of volcanic processes and lessen the harmful impacts of volcanic activity in the volcanically active areas of California and Nevada. For additional USGS CalVO volcano information, background, images, and other graphics visit http://volcano.wr.usgs.gov/vsc/observatories/calvo.html. For general information on the USGS Volcano Hazard Program http://volcanoes.usgs.gov. Statewide seismic information for California and Nevada can be found at http://earthquake.usgs.gov/earthquakes/recenteqscanv/.
CALIFORNIA VOLCANO OBSERVATORY MONTHLY UPDATE
Sunday, April 1, 2012 6:49 PM PDT (Monday, April 2, 2012 01:49 UTC)
Monitored CALIFORNIA VOLCANOES Current Volcano Alert Level: all NORMAL Current Aviation Color Code: all GREEN
Activity Update: All volcanoes monitored by CalVO's telemetered, real-time sensor networks exhibit normal levels of background seismicity and deformation. Real-time monitoring networks are in place at Mount Shasta, Medicine Lake Volcano, Clear Lake Volcanic Field, Lassen Volcanic Center, Long Valley Caldera and Mono-Inyo Chain.
Observations for March 1, 2012 (00:00 PST) through March 31, 2012 (11:59 PDT): Mt Shasta: Three earthquakes under the SE flank; the largest M=2.2. Medicine Lake: One M=2.3 earthquake under the NE rim of the caldera. Lassen Volcanic Center: Four earthquakes, all below magnitude 2.0, located about 1.5 miles east of Bumpass Mountain within Lassen Volcanic National Park. Clear Lake Volcanic Field: Three earthquakes within the southeast arm of Clear Lake. The largest event, a M=3.8* on March 31 at 11:17 PM, produced light shaking in the town of Clear Lake and vicinity. The two others were below 2.0. [Note: Typical high level of seismicity observed under the Geysers steam field located outside the eastern margin of CLVF. Largest event was M=3.1]. Long Valley Caldera and Mono-Inyo Chain: Seven earthquakes occurred in Long Valley Caldera east of Mammoth Lakes (all with M<2.0); Fifteen earthquakes east of Mono Lake (one M=2.3 and the others M<2.0); Three earthquakes under northeast flank of Mammoth Mountain (all M<2.0). [Note: Typical high level of seismicity observed south of the caldera in the Sierra Nevada range. Largest events were M=2.8, 2.0, 2.7,2.3].
The U.S. Geological Survey will continue to monitor these volcanoes closely and will issue additional updates and changes in alert level as warranted. For a definition of alert levels see http://volcanoes.usgs.gov/activity/alertsystem/icons.php.
As part of the U.S. Geological Survey's Volcano Hazards Program, the California Volcano Observatory aims to advance scientific understanding of volcanic processes and lessen the harmful impacts of volcanic activity in the volcanically active areas of California and Nevada. For additional USGS CalVO volcano information, background, images, and other graphics visit http://volcano.wr.usgs.gov/vsc/observatories/calvo.html. For general information on the USGS Volcano Hazard Program http://volcanoes.usgs.gov. Statewide seismic information for California and Nevada can be found at http://earthquake.usgs.gov/earthquakes/recenteqscanv/.
* Downgraded to M=2.9 after review by seismologist.
CALIFORNIA VOLCANO OBSERVATORY MONTHLY UPDATE
Friday, March 2, 2012 3:48 PM PST (Friday, March 2, 2012 23:48 UTC)
Monitored CALIFORNIA VOLCANOES Current Volcano Alert Level: all NORMAL Current Aviation Color Code: all GREEN
Activity Update: All volcanoes monitored by CalVO's telemetered, real-time sensor networks exhibit normal levels of background seismicity and deformation. Real-time monitoring networks are in place at Mount Shasta, Medicine Lake Volcano, Clear Lake Volcanic Field, Lassen Volcanic Center, Long Valley Caldera and Mono-Inyo Chain.
Observations for February 1, 2012 (00:00 PST) through February 29, 2012 (11:59 PST): Mt Shasta: Two M<2.0 earthquakes under the SE flank. Medicine Lake: One M=1.6 earthquake on the NE rim of the caldera. Lassen Volcanic Center: No earthquakes of M=1.0 or greater. Clear Lake Volcanic Field: Sixteen earthquakes on the southeast arm of Clear Lake (largest M=2.23; all others below 2.0). [Note: Typical high level of seismicity observed under the Geysers steam field located outside the eastern margin of CLVF. Largest event was M=4.2]. Long Valley Caldera and Mono-Inyo Chain: Three earthquakes occurred in Long Valley Caldera east of Mammoth Lakes (all with M<2.0); Three earthquakes east of Mono Lake (all M<2.0); Four earthquakes under north flank of Mammoth Mountain (all M<2.0). [Note: Typical high level of seismicity observed south of the caldera in the Sierra Nevada range. Largest event was M=2.8].
The U.S. Geological Survey will continue to monitor these volcanoes closely and will issue additional updates and changes in alert level as warranted. For a definition of alert levels see http://volcanoes.usgs.gov/activity/alertsystem/icons.php.
As part of the U.S. Geological Survey's Volcano Hazards Program, the California Volcano Observatory aims to advance scientific understanding of volcanic processes and lessen the harmful impacts of volcanic activity in the volcanically active areas of California and Nevada. For additional USGS CalVO volcano information, background, images, and other graphics visit http://volcano.wr.usgs.gov/vsc/observatories/calvo.html. For general information on the USGS Volcano Hazard Program http://volcanoes.usgs.gov. Statewide seismic information for California and Nevada can be found at http://earthquake.usgs.gov/earthquakes/recenteqscanv/.
CALIFORNIA VOLCANO OBSERVATORY MONTHLY UPDATE
Thursday, February 9, 2012 9:30 AM PST (Thursday, February 9, 2012 17:30 UTC)
Monitored CALIFORNIA VOLCANOES Current Volcano Alert Level: all NORMAL Current Aviation Color Code: all GREEN
Activity Update: All volcanoes monitored by CalVO's telemetered, real-time sensor networks exhibit normal levels of background seismicity and deformation. Real-time monitoring networks are in place at Mount Shasta, Medicine Lake Volcano, Clear Lake Volcanic Field, Lassen Volcanic Center, Long Valley Caldera and Mono-Inyo Chain.
Observations for January 1, 2012 (00:00 PST) through January 31, 2012 (00:00 PST): Mt Shasta: One M=1.6 earthquake. Medicine Lake: No earthquakes of M=1.0 or greater. Lassen Volcanic Center: No earthquakes of M=1.0 or greater. Clear Lake Volcanic Field: Seven earthquakes (largest M=3.8; all others below 2.0). [Note: Typical high level of seismicity observed under the Geysers steam field located outside the eastern margin of CLVF. Largest event was M=3.1]. Long Valley Caldera and Mono-Inyo Chain: Ten earthquakes occurred in Long Valley Caldera (all with M<2.0); Nine earthquakes east of Mono Lake (all M<2.0); Eight earthquakes under Mammoth Mountain (all M<2.0). [Note: Typical high level of seismicity observed south of the caldera in the Sierra Nevada range. Largest event was M=2.9].
The U.S. Geological Survey will continue to monitor these volcanoes closely and will issue additional updates and changes in alert level as warranted. For a definition of alert levels see http://volcanoes.usgs.gov/activity/alertsystem/icons.php.
As part of the U.S. Geological Survey's Volcano Hazards Program, the California Volcano Observatory aims to advance scientific understanding of volcanic processes and lessen the harmful impacts of volcanic activity in the volcanically active areas of California and Nevada. For additional USGS CalVO volcano information, background, images, and other graphics visit http://volcano.wr.usgs.gov/vsc/observatories/calvo.html. For general information on the USGS Volcano Hazard Program http://volcanoes.usgs.gov. Statewide seismic information for California and Nevada can be found at http://earthquake.usgs.gov/earthquakes/recenteqscanv/.
LONG VALLEY OBSERVATORY WEEKLY UPDATE
Thursday, January 12, 2012 5:46 PM PST (Friday, January 13, 2012 01:46 UTC)
LONG VALLEY VOLCANIC CENTER VOLCANO (CAVW #1203-14-) 37°42' N 118°52'12" W, Summit Elevation 7231 ft (2204 m) Current Volcano Alert Level: NORMAL Current Aviation Color Code: GREEN
Fifteen earthquakes with magnitudes between M=1.0 and M=1.8 occurred in the Mammoth Lakes-Long Valley region in the last seven days. The events were located in the Sierra Nevada, with the exception of three earthquakes in the caldera east of the town of Mammoth Lakes and one event in Round Valley.
LONG VALLEY OBSERVATORY WEEKLY UPDATE
Wednesday, January 4, 2012 3:01 PM PST (Wednesday, January 4, 2012 23:01 UTC)
LONG VALLEY VOLCANIC CENTER VOLCANO (CAVW #1203-14-) 37°42' N 118°52'12" W, Summit Elevation 7231 ft (2204 m) Current Volcano Alert Level: NORMAL Current Aviation Color Code: GREEN
Fifteen earthquakes with magnitudes between M=1.0 and M=3.0 occurred in the Mammoth Lakes-Long Valley region in the last seven days. The events were located in the Sierra Nevada, with the exception of two events in the caldera east of Mammoth Lakes and one event in Round Valley.
LONG VALLEY OBSERVATORY WEEKLY UPDATE
Monday, December 19, 2011 11:25 AM PST (Monday, December 19, 2011 19:25 UTC)
LONG VALLEY VOLCANIC CENTER VOLCANO (CAVW #1203-14-) 37°42' N 118°52'12" W, Summit Elevation 7231 ft (2204 m) Current Volcano Alert Level: NORMAL Current Aviation Color Code: GREEN
Four earthquakes occurred in the Mammoth Lakes-Long Valley region in the last seven days, all below magnitude 2.0, and located in the Sierra Nevada south of the caldera.
LONG VALLEY OBSERVATORY WEEKLY UPDATE
Friday, December 9, 2011 3:47 PM PST (Friday, December 9, 2011 23:47 UTC)
LONG VALLEY VOLCANIC CENTER VOLCANO (CAVW #1203-14-) 37°42' N 118°52'12" W, Summit Elevation 7231 ft (2204 m) Current Volcano Alert Level: NORMAL Current Aviation Color Code: GREEN
Ten earthquakes occurred in the Mammoth Lakes-Long Valley region in the last seven days, all below magnitude 2.0. Four of the events were located in the Sierra Nevada south of the caldera. The others were located inside the caldera east of Mammoth Lakes.
LONG VALLEY OBSERVATORY WEEKLY UPDATE
Wednesday, November 16, 2011 11:07 AM PST (Wednesday, November 16, 2011 19:07 UTC)
LONG VALLEY VOLCANIC CENTER VOLCANO (CAVW #1203-14-) 37°42' N 118°52'12" W, Summit Elevation 7231 ft (2204 m) Current Volcano Alert Level: NORMAL Current Aviation Color Code: GREEN
Thirty earthquakes occurred in the Mammoth Lakes-Long Valley region in the last seven days. All of the events were located in the Sierra Nevada south of the caldera. Magnitudes ranged between between M=1.0 and M=3.5, although only five of the thirty were M=2.0 or above. The magnitude M=3.5 earthquake, which occurred on November 14 at 2:33 PM PST, produced weak shaking in the town of Mammoth Lakes.
LONG VALLEY OBSERVATORY WEEKLY UPDATE
Monday, November 7, 2011 3:44 PM PST (Monday, November 7, 2011 23:44 UTC)
LONG VALLEY VOLCANIC CENTER VOLCANO (CAVW #1203-14-) 37°42' N 118°52'12" W, Summit Elevation 7231 ft (2204 m) Current Volcano Alert Level: NORMAL Current Aviation Color Code: GREEN
Twelve earthquakes occurred in the Mammoth Lakes-Long Valley region in the past week (since 10:47PM PDT on October 31,2011). All of the events were between magnitude 1.0 and 1.8. Most were located in the Sierra Nevada south of Mammoth Lakes, but three were located in the caldera and one was located in Round Valley south of Toms Place .