LONG VALLEY OBSERVATORY DAILY UPDATETuesday, November 24, 2009 9:19 AM PST (Tuesday, November 24, 2009 17:19 UTC)

LONG VALLEY VOLCANIC CENTER VOLCANO (CAVW #1203-14-)
37°42' N 118°52'12" W, Summit Elevation 11122 ft (3390 m)
Current Volcano Alert Level: NORMAL
Current Aviation Color Code: GREEN

The real-time computer system located two small earthquakes in the vicinity of Long Valley caldera since the last update at 9:45 AM (PST) on November 23, both in the Sierra Nevada south of the caldera. Magnitude M=1.0 and M=1.2 earthquakes at 11:04 AM and 7:57 PM on the 23nd were located 11 miles ESE and 15 miles SSW of Mammoth Lakes, respectively.

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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.