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LONG VALLEY OBSERVATORY WEEKLY UPDATE
Friday, July 15, 2011 8:16 PM PDT (Saturday, July 16, 2011 03:16 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
Twenty-six small earthquakes between magnitude 1.0 and 2.2 occurred in the Mammoth Lakes-Long Valley caldera region in the past week (since 7/8/2011). All of these were located in the Sierra Nevada south of the town of Mammoth Lakes.
News
USGS rules out volcanic origin of plume-like feature seen in NEXRAD in Mojave Desert (California)
Inquiries have come to the USGS regarding a potential eruption in the vicinity of Lavic Lake Volcanic Field (LLVF) in Southern California. The inquiries stem from a citizen report noting a plume-like feature on NEXRAD radar imagery from July 23, 2011. USGS volcanologists evaluating the situation find nothing to indicate that the NEXRAD feature results from volcanic activity. Satellite images from the same period do not show the steam or ash clouds that accompany volcanic activity, and there is no seismicity in the vicinity indicative of volcanic unrest/eruption. No earthquakes were located within 20 miles of LLVF during the last week (USGS-Caltech Seismic Net update 14:10 PDT July 27, 2011 ). No reports of eruptive activity have come in from ground observers (LLVF is within 2 miles of Interstate 40) or from regional pilots (Barstow Daggett County Airport is within 10 miles of LLVF).The USGS monitors volcanic unrest and provides announcements of volcanic activity within the US as soon as detected and confirmed. Often, warnings of possible volcanic activity are issued in advance, based on data from satellite or ground-based sensor networks. The status of US volcanoes is always available at the Volcano Hazards Program website.
Background: The Lavic Lake Volcanic Field is located in the Mojave Desert, south-central California (34.75 deg N / 116.625 deg W). Lavic Lake Volcanic Field is a collection of cinder cones and lava flows produced during effusive (non-explosive) eruptions of basaltic lava. The age of Lavic Lake volcanism is not well constrained, but the most recent eruption (Pisgah Crater) likely occurred about 25,000 years before present (Smithsonian Institution, Global Volcanism Program). It is a seismically active area cut by numerous Basin and Range faults.
Source
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