Recent Status Report, Updates, and Information Releases
LONG VALLEY OBSERVATORY CURRENT STATUS REPORT
Sunday, May 11, 2008 05:25 PDT (Sunday, May 11, 2008 12:25 UTC)
LONG VALLEY VOLCANIC CENTER VOLCANO (CAVW#1203-14-)
37.70°N 118.87°W, Summit Elevation 11122 ft (3390 m)
Volcano Alert Level: NORMAL
Aviation Color Code: GREEN
The realtime detection system located no earthquakes in the Long Valley caldera area since the last update at 4:50 AM (DPT) on May 10.
-----
The Long Valley Observatory (LVO) monitors and studies earthquakes, ground deformation, degassing, and other types of geologic unrest in and around the Long Valley Caldera. The 15 by 30 km Long Valley Caldera was formed during an eruption 760,000 years ago and is located 20 km south of Mono Lake along the east side of the Sierra Nevada in east-central California. There have been multiple smaller eruptions since the caldera-forming eruption with the most recent occurring 250 years ago in Mono Lake at the north end of Mono-Inyo Craters volcanic chain. LVO is one of the five USGS Volcano Observatories that monitor volcanoes within the United States for science and public safety.
LONG VALLEY OBSERVATORY CURRENT STATUS REPORT
Saturday, May 10, 2008 04:50 PDT (Saturday, May 10, 2008 11:50 UTC)
LONG VALLEY VOLCANIC CENTER VOLCANO (CAVW#1203-14-)
37.70°N 118.87°W, Summit Elevation 11122 ft (3390 m)
Volcano Alert Level: NORMAL
Aviation Color Code: GREEN
The realtime detection system located four small earthquakes in the Long Valley caldera area since the last update at 5:35 AM (DPT) on May 9. All were located in the Sierra Nevada south of the caldera. The largest was a magnitude M=2.7 at 10:21 AM (PDT) on the 9th located 9 miles SE of Mammoth Lakes.
-----
The Long Valley Observatory (LVO) monitors and studies earthquakes, ground deformation, degassing, and other types of geologic unrest in and around the Long Valley Caldera. The 15 by 30 km Long Valley Caldera was formed during an eruption 760,000 years ago and is located 20 km south of Mono Lake along the east side of the Sierra Nevada in east-central California. There have been multiple smaller eruptions since the caldera-forming eruption with the most recent occurring 250 years ago in Mono Lake at the north end of Mono-Inyo Craters volcanic chain. LVO is one of the five USGS Volcano Observatories that monitor volcanoes within the United States for science and public safety.
LONG VALLEY OBSERVATORY CURRENT STATUS REPORT
Friday, May 9, 2008 05:32 PDT (Friday, May 9, 2008 12:32 UTC)
LONG VALLEY VOLCANIC CENTER VOLCANO (CAVW#1203-14-)
37.70°N 118.87°W, Summit Elevation 11122 ft (3390 m)
Volcano Alert Level: NORMAL
Aviation Color Code: GREEN
The realtime detection system located one small earthquake in the Long Valley caldera area since the last update at 6:45 AM (DPT) on May 7. This was a magnitude M=2.0 earthquake at 5:32 PM (PDT) on the 6th located in the Sierra Nevada 8 miles SE of Mammoth Lakes.
-----
The Long Valley Observatory (LVO) monitors and studies earthquakes, ground deformation, degassing, and other types of geologic unrest in and around the Long Valley Caldera. The 15 by 30 km Long Valley Caldera was formed during an eruption 760,000 years ago and is located 20 km south of Mono Lake along the east side of the Sierra Nevada in east-central California. There have been multiple smaller eruptions since the caldera-forming eruption with the most recent occurring 250 years ago in Mono Lake at the north end of Mono-Inyo Craters volcanic chain. LVO is one of the five USGS Volcano Observatories that monitor volcanoes within the United States for science and public safety.
LONG VALLEY OBSERVATORY CURRENT STATUS REPORT
Thursday, May 8, 2008 06:45 PDT (Thursday, May 8, 2008 13:45 UTC)
LONG VALLEY VOLCANIC CENTER VOLCANO (CAVW#1203-14-)
37.70°N 118.87°W, Summit Elevation 11122 ft (3390 m)
Volcano Alert Level: NORMAL
Aviation Color Code: GREEN
The realtime detection system located two small earthquakes in the Long Valley caldera area since the last update at 9:11 AM on May 6. Both had magnitudes less than M=2.0. They both were located in the Sierra Nevada south of the caldera, and both occurred on the 6th.
-----
The Long Valley Observatory (LVO) monitors and studies earthquakes, ground deformation, degassing, and other types of geologic unrest in and around the Long Valley Caldera. The 15 by 30 km Long Valley Caldera was formed during an eruption 760,000 years ago and is located 20 km south of Mono Lake along the east side of the Sierra Nevada in east-central California. There have been multiple smaller eruptions since the caldera-forming eruption with the most recent occurring 250 years ago in Mono Lake at the north end of Mono-Inyo Craters volcanic chain. LVO is one of the five USGS Volcano Observatories that monitor volcanoes within the United States for science and public safety.
LONG VALLEY OBSERVATORY CURRENT STATUS REPORT
Tuesday, May 6, 2008 09:11 PDT (Tuesday, May 6, 2008 16:11 UTC)
LONG VALLEY VOLCANIC CENTER VOLCANO (CAVW#1203-14-)
37.70°N 118.87°W, Summit Elevation 11122 ft (3390 m)
Volcano Alert Level: NORMAL
Aviation Color Code: GREEN
The only earthquake the realtime detection system located in the Long Valley caldera area since the last update at 9:26 AM on May 5 was another M=1.3 aftershock to the M=3.0 earthquake of May 3. This most recent aftershock occurred at 4:45 PM on the 4th. As with the earlier events, it was located just SW of Duck Lake (7 miles south of Mammoth Lakes).
-----
The Long Valley Observatory (LVO) monitors and studies earthquakes, ground deformation, degassing, and other types of geologic unrest in and around the Long Valley Caldera. The 15 by 30 km Long Valley Caldera was formed during an eruption 760,000 years ago and is located 20 km south of Mono Lake along the east side of the Sierra Nevada in east-central California. There have been multiple smaller eruptions since the caldera-forming eruption with the most recent occurring 250 years ago in Mono Lake at the north end of Mono-Inyo Craters volcanic chain. LVO is one of the five USGS Volcano Observatories that monitor volcanoes within the United States for science and public safety.
LONG VALLEY OBSERVATORY CURRENT STATUS REPORT
Monday, May 5, 2008 09:26 PDT (Monday, May 5, 2008 16:26 UTC)
LONG VALLEY VOLCANIC CENTER VOLCANO (CAVW#1203-14-)
37.70°N 118.87°W, Summit Elevation 11122 ft (3390 m)
Volcano Alert Level: NORMAL
Aviation Color Code: GREEN
The realtime detection system located just one small earthquakes in the Long Valley caldera area since the last update at 9:12 AM on May 4. This M=1.3 earthquake at 5:24 PM on the 4th was an aftershock to the M=3.0 earthquake located just SW of Duck Lake on May 3rd (7 miles south of Mammoth Lakes).
-----
The Long Valley Observatory (LVO) monitors and studies earthquakes, ground deformation, degassing, and other types of geologic unrest in and around the Long Valley Caldera. The 15 by 30 km Long Valley Caldera was formed during an eruption 760,000 years ago and is located 20 km south of Mono Lake along the east side of the Sierra Nevada in east-central California. There have been multiple smaller eruptions since the caldera-forming eruption with the most recent occurring 250 years ago in Mono Lake at the north end of Mono-Inyo Craters volcanic chain. LVO is one of the five USGS Volcano Observatories that monitor volcanoes within the United States for science and public safety.
Long Term Trends
Seismic Trend:
Earthquake activity within and adjacent to the caldera
has remained low since mid-1999 averaging just five to
ten earthquake per day with magnitudes less than M=2 and
an occasional event as large as M=3. see details.
Deformation trend: Renewed uplift of the
resurgent dome that began in early 2002 ended in early
2003 largely offsetting the 2 cm of subsidence that
accumulated from early 1999 through the end of 2001.
The resurent dome has since shown minor fluctuations in
uplift and subsidence but remains roughly 80 cm higher
than in the late 1970's. see details.
CO2 trend: The diffuse carbon
dioxide gas flux in the Horseshoe Lake tree-kill area has
shown little change from the relatively high levels of 50
to 150 tons per day sustained for the past several
years; see details.
This dynamically updated status page is replacing the
CurrentConditions.html page. For more information about the new template
and the CAP format, please see the Volcano Hazards Home Page.
-->
U.S. Department of the Interior | U.S. Geological Survey
