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Mammoth Mountain volcano
lava domes 3369 m / 11,053 ft
California, USA, 37.63°N / -119.03°W

Mammoth Mountain webcams / live data
Mammoth Mountain volcano eruptions:
1260 ± 40 years
Typical eruption style:
effusive
Last earthquakes nearby

News & activity updates

Tuesday, Feb 11, 2014
Location of recent earthquakes near Mammoth Mountain (CA)
Location of recent earthquakes near Mammoth Mountain (CA)
Number of earthquakes in the Long Valley caldera over the 30 days, showing the recent swarm (USGS)
Number of earthquakes in the Long Valley caldera over the 30 days, showing the recent swarm (USGS)
An small earthquake swarm at shallow depths (around 5 km) occurred east of Mammoth Mountain during the past week. The largest quake was a magnitude 3.0 event on 5 Feb. ...more [read all]
Sunday, Feb 03, 2013
Map of recent quakes near Mammoth Mountain
Map of recent quakes near Mammoth Mountain
Small earthquakes continue beneath and (mostly) immediately to the SE of Mammoth Mountain in the Sierra Nevada range.
Tuesday, Jan 29, 2013
Depth vs time of quakes under Mammoth Mountain
Depth vs time of quakes under Mammoth Mountain
Map of recent quakes near Mammoth Mountain
Map of recent quakes near Mammoth Mountain
Another small earthquake swarm occurred under the (dormant) volcano during 28-29 Jan. Numerous tiny quakes were registered at shallow depths (mostly 1-5 km).
Tuesday, Jan 22, 2013
Seismic recording at Mammoth Mountain (MMS station, USGS)
Seismic recording at Mammoth Mountain (MMS station, USGS)
Tiny earthquakes (less than mag 1) and some deep low-frequency events continue to occur at normal background levels under Mammoth Mountain.
Monday, Jan 21, 2013
Time and depth of recent earthquakes under Mammoth Mountain
Time and depth of recent earthquakes under Mammoth Mountain
A small earthquake swarm occurred at Mammoth Mountain during 14-20 Jan and seems to have ended.
Sunday, Jan 06, 2013
Time and depth of quakes near Mammoth Mountain during the past days
Time and depth of quakes near Mammoth Mountain during the past days
A small seismic swarm occurred between 4-5 January with quakes at depth of 12-15 km.
Friday, Dec 28, 2012
Time and depth of quakes near Mammoth Mountain
Time and depth of quakes near Mammoth Mountain
Seismic signal from Mammoth Mountain (MRD station, USGS)
Seismic signal from Mammoth Mountain (MRD station, USGS)
Another (weak) earthquake swarm has started yesterday evening at Mammoth Mountain. Most quakes are at about 20 km depth in an area 5 km SW of the mountain.
Friday, Nov 16, 2012
Time and depth of quakes near Mammoth Mountain during the past days
Time and depth of quakes near Mammoth Mountain during the past days
Another small earthquake swarm has occurred between 14-16 Nov. Such seismic activity falls into the normal behaviour of an active caldera system, and should not be seen as indicator of new eruptions to be expected in the near future. USGS who monitor their volcanoes very carefully maintain alert level green (normal) for Long Valley and Mammoth Mountain.
Thursday, Nov 08, 2012
Time and depth of quakes near Mammoth Mountain
Time and depth of quakes near Mammoth Mountain
The shallow seismic swarm near Mammoth Mountain continues at reduced pace.
Wednesday, Nov 07, 2012
Time and depth of quakes near Mammoth Mountain
Time and depth of quakes near Mammoth Mountain
Location of quakes in the past days aat Mammoth Mountain
Location of quakes in the past days aat Mammoth Mountain
Another small seismic swarm has occurred (or started) yesterday near Mammoth Mountain, with about 20 very small quakes located at about 6 km east of the volcano at depths mostly between 10 and 5 km. A larger magnitude 2.9 event at 13.5 km followed this morning (GMT time). ...more
Wednesday, Oct 31, 2012
Time and depth of quakes under Mammoth Mountain during the past week
Time and depth of quakes under Mammoth Mountain during the past week
A stronger than usual seismic swarm was recorded beneath Mammoth Mountain volcano in California during 29 October. The swarm, in such not uncommon, was accompanied by slight deformation ...more [read all]

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