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Long Valley volcano
caldera 3390 m / 11,122 ft
California, 37.7°N / -118.87°W

Long Valley webcams / live data
Long Valley volcano eruptions:
111,000-57,000 years ago (formation of Mammoth Mountain)
Typical eruption style:
Explosive
Last earthquakes nearby
Friday, Jul 19, 2013
Map of recent quakes at the Long Valley caldera (California)
Map of recent quakes at the Long Valley caldera (California)
Normal seismic activity with numerous tiny earthquakes continues to occur at the southern and western parts of the caldera as well as under Mammoth mountain. There are no signs of a possible eruption in a near future.
Sunday, Mar 31, 2013
Location of yesterday's 3.8 earthquake
Location of yesterday's 3.8 earthquake
Depth vs time of quakes at the Long Valley caldera (CA)
Depth vs time of quakes at the Long Valley caldera (CA)
Some felt earthquakes have occurred recently along the southern boundary of Long Valley Caldera, the latest a 3.8 magnitude quakes yesterday. This is not unusual for the volcanic system and does not mean any volcanic eruption should be expected in a near future. The alert status remains green (normal).
Wednesday, Mar 20, 2013
Depth vs time of quakes at the Long Valley caldera (CA)
Depth vs time of quakes at the Long Valley caldera (CA)
Location of recent quakes at the Long Valley caldera
Location of recent quakes at the Long Valley caldera
Small earthquakes continue to occur clustered near the SW margin of the caldera and Mammoth Mountain. The earthquake are tiny to small (less than magnitude 2) and show nothing usual going on.
Saturday, Jan 26, 2013
Map of recent quakes near Mammoth Mountain
Map of recent quakes near Mammoth Mountain
Seismic recording at Mammoth Mountain (MMS station, USGS)
Seismic recording at Mammoth Mountain (MMS station, USGS)
Tiny quakes continue to be recorded under and near the Long Valley caldera. A small swarm is visible today in an area 20 km to the SE of Mammoth Mountain, at the SW limit of the caldera.
Friday, Aug 24, 2012
Small earthquake swarm at Long Valley on 24 Aug 2012
Small earthquake swarm at Long Valley on 24 Aug 2012
A small earthquake swarm has developed at the southern margin of the caldera, just north of Convict Lakes. The largest was a 2.5 event at 10 km depth. ...more [read all]
Tuesday, Aug 14, 2012
Location of the recent quakes at Long Valley (red dots for 12-13 Aug)
Location of the recent quakes at Long Valley (red dots for 12-13 Aug)
A small swarm of earthquakes could be during 12-13 Aug. About 30 (very small mostly

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