Recent Status Report, Updates, and Information Releases

LONG VALLEY OBSERVATORY CURRENT STATUS REPORT
Friday, July 3, 2009 09:28 PDT (Friday, July 3, 2009 16:28 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 real-time detection system located no earthquakes in the Long Valley caldera region since the last update at 9:25 AM (PDT) on July 2.

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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, July 2, 2009 09:25 PDT (Thursday, July 2, 2009 16:25 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 real-time detection system located no earthquakes in the Long Valley caldera region since the last update at 9:21 AM (PDT) on July 1.

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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
Wednesday, July 1, 2009 09:21 PDT (Wednesday, July 1, 2009 16:21 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 real-time detection system located two small earthquakes in the Long Valley caldera region since the last update at 9:29 AM (PDT) on June 30. Both had magnitudes less than M=1.0.

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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, June 30, 2009 09:29 PDT (Tuesday, June 30, 2009 16:29 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 real-time detection system located one small earthquake in the Long Valley caldera region since the last update at 8:17 AM (PDT) on June 29. This was a M=1.5 earthquake at 8:05 PM on the 29th located in the Sierra Nevada south of the caldera (10 miles SW of Tom's Place).

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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, June 29, 2009 08:17 PDT (Monday, June 29, 2009 15:17 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 real-time detection system located two small earthquakes in the Long Valley caldera region since the last update at 7:06 AM (PDT) on June 27. Both were located in the Sierra Nevada south of the caldera. The largest was a M=1.8 earthquake at 2:58 AM on the 29th located 7 miles west of Tom's Place.
Elsewhere, a M=2.6 earthquake at 5:19 AM on the 28th was located 3 miles NNE of Big Pine.

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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, June 27, 2009 07:06 PDT (Saturday, June 27, 2009 14:06 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 real-time detection system located just one small earthquake in the Long Valley caldera region since the last update at 9:21 AM (PDT) on June 26. This was a M=0.6 earthquake at 10:14 AM on the 26th located in the Sierra Nevada 12 miles SSW of Mammoth Lakes.

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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, June 26, 2009 09:21 PDT (Friday, June 26, 2009 16:21 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 real-time detection system located four small earthquakes in the Long Valley caldera region since the last update at 9:12 AM (PDT) on June 25, all located in the Sierra Nevada south of the caldera. The largest was a M=2.3 earthquake at 9:00 PM on the 25th located 6 miles WSW of Tom's Place. A M=1.1 earthquake at 12:58 on the 25th was located beneath the eastern margin of the Volcanic Tableland (9 miles north of Bishop).

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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.

Update Archive and Quarterly and Annual Summaries | Reference map for place names

For more information about the Volcano Alert Level and Aviation Color Code, please see the USGS Volcanic Activity Alert-Notification System web page.

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Page Last Modified: Tuesday, 18-Nov-2008 13:31:02 (dyv)