Alert Level: NORMAL
Color Code: GREEN
Cap Certainty: NULL
Cap Severity: NULL
Cap Urgency: NULL
Is Elevated Cap:
Prev Elevated Cap:
Notice Identifier: DOI-USGS-CALVO-2009-11-18T16:05:08-00:00
Pub Date: 2009-11-18 16:05:08
Sent Date Cap: 2009-11-18 16:05:08
Cap Expires: 2009-11-18 16:05:08
Mail Subject: California Volcano Observatory: Lassen Volcanic Center
Author: California Volcano Observatory
Synopsis: Archived
Guid: https://volcanoes.usgs.gov/hans-public/notice/DOI-USGS-CALVO-2009-11-18T16:05:08-00:00
Prev Guid: NULL
Msg Type: Archived
Notice Type Cd: IS
Notice Data: https://volcanoes.usgs.gov/hans-public/api/notice/getNotice/DOI-USGS-CALVO-2009-11-18T16:05:08-00:00
Highest Alert Level: NORMAL
Highest Color Code: GREEN
Volcano Cds CSV: ca9
lat: 40.492
lng: -121.508
vnum: 323080
vName: Lassen Volcanic Center
region: California
vImage: 
summary: Information Statement for the November 2-16, 2009, Lassen Peak swarm activityA series of small earthquake swarms beneath the southwest flank of Lassen Peak in Lassen Volcanic National Park that began in the late evening on November 2 continued with sporadic activity diminishing through the 16th. The activity was most intense on the November 3rd with the largest earthquake in the sequence a magnitude M=2.5 event at 1:54 PM (PDT) on the 3rd. These earthquakes are centered some 3 km (2 miles)southwest of the summit of Lassen Peak between Eagle Peak and Mount Diller at a depth of roughly 5 km (3 miles) beneath the surface.Earthquake swarms are not unusual in this area. Earlier activity in this same area over the last five years includes swarms on March 2009, February 15-16, 2005 (14 events including a M=2.3 earthquake), February 21 2006 (13 events with a M=2.2 earthquake), January 18-19, 2007 (29 events with a M=1.9 earthquake), and September 7-8, 2008 (41 events with a M=2.3 earthquake). This most recent swarm activity appears to be within the norm of earthquake activity detected in the Lassen area since the modern seismic network was installed in 1980. The USGS will continue to monitor the situation closely.This statement corrects an error in the first line of the release yesterday (11/17/2009)Contact: David P. Hill,
[email protected] synopsis: CALVO Lassen Volcanic Center GREEN/NORMAL - Information Statement for the November 2 through 10, 2009, Lassen Peak swarm activity
colorCode: GREEN
sectionId: DOI-USGS-CVO-2009-11-18T08:05:08-08:00
alertLevel: NORMAL
sectionHtml: CALIFORNIA VOLCANO OBSERVATORY INFORMATION STATEMENT
U.S. Geological Survey
Wednesday, November 18, 2009, 8:05 AM PST (Wednesday, November 18, 2009, 16:05 UTC)
LASSEN VOLCANIC CENTER VOLCANO(VNUM #323080)
40°29'31" N 121°30'29" W, Summit Elevation 10456 ft (3187 m)
Current Volcano Alert Level: NORMAL
Current Aviation Color Code: GREEN
Information Statement for the November 2-16, 2009, Lassen Peak swarm activity
A series of small earthquake swarms beneath the southwest flank of Lassen Peak in Lassen Volcanic National Park that began in the late evening on November 2 continued with sporadic activity diminishing through the 16th. The activity was most intense on the November 3rd with the largest earthquake in the sequence a magnitude M=2.5 event at 1:54 PM (PDT) on the 3rd. These earthquakes are centered some 3 km (2 miles)southwest of the summit of Lassen Peak between Eagle Peak and Mount Diller at a depth of roughly 5 km (3 miles) beneath the surface.
Earthquake swarms are not unusual in this area. Earlier activity in this same area over the last five years includes swarms on March 2009, February 15-16, 2005 (14 events including a M=2.3 earthquake), February 21 2006 (13 events with a M=2.2 earthquake), January 18-19, 2007 (29 events with a M=1.9 earthquake), and September 7-8, 2008 (41 events with a M=2.3 earthquake). This most recent swarm activity appears to be within the norm of earthquake activity detected in the Lassen area since the modern seismic network was installed in 1980. The USGS will continue to monitor the situation closely.
This statement corrects an error in the first line of the release yesterday (11/17/2009)
Contact: David P. Hill, [email protected]