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News

Tuesday, Feb 11, 2014
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]
Map of recent quakes near Mammoth Mountain
Sunday, Feb 03, 2013
Small earthquakes continue beneath and (mostly) immediately to the SE of Mammoth Mountain in the Sierra Nevada range. [more]
 

Mammoth Mountain volcano

lava domes 3369 m / 11,053 ft
California, USA, 37.63°N / -119.03°W
Current status: dormant (1 out of 5)
Mammoth Mountain webcams / live data | Reports
Mammoth Mountain volcano books
Last update: 11 Feb 2014 (occasional seismic swarms)
Typical eruption style: effusive
Mammoth Mountain volcano eruptions: 1260 ± 40 years
TimeMag. / DepthDistanceLocation
Wed, 21 Feb
Wed, 21 Feb 01:46 UTCM 0.3 / 1.9 km14 km- 14km W of Toms Place, CA
Wed, 21 Feb 00:30 UTCM 0.6 / 0.4 km6 km- 5km NNE of Mammoth Lakes, CA
Tue, 20 Feb
Tue, 20 Feb 20:40 UTCM 1.2 / 8.1 km21 km- 2km W of Toms Place, CA
Tue, 20 Feb 18:19 UTCM 0.5 / 0.7 km14 km- 14km ESE of Mammoth Lakes, CA
Tue, 20 Feb 10:05 UTCM 0.9 / 2.7 km6 km- 10km E of Mammoth Lakes, CA
View all recent quakes
Mammoth Mountain is a lava-dome complex on the SW rim of Long Valley caldera, California. Despite its close geographic relation, it is believed that it has its own magma chamber different from the ones underlying Long Valley caldera and the Inyo craters.

Background:

The last eruption of the lava dome complex itself took place about 57,000 years ago. There are more than 35 vents fed by the same magma chamber, including Red Cones, two basaltic cinder cones SE of Mammoth Mountain and SE of Devils Postpile National Monument. The cones, whose name derives from their colorful upper scoria deposits, were radiocarbon dated at about 8900 years ago.
Phreatic eruptions on the north side of Mammoth Mountain took place about 700 years ago. The recent unrest, including seismicity, gas emission, and tree kill, at the Long Valley caldera is thought to be related to a dike intrusion beneath Mammoth Mountain in 1989.
(Source: GVP)


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