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. ...
Sunday, Feb 03, 2013
Small earthquakes continue beneath and (mostly) immediately to the SE of Mammoth Mountain in the Sierra Nevada range.
Mammoth Mountain volcano
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.
11 Feb 2014 (occasional seismic swarms)
Typical eruption style
Mammoth Mountain volcano eruptions
: 1260 ± 40 years
Last earthquakes nearby:
View all recent quakes
|Time||Mag. / Depth||Distance||Location|
|Thu, 24 Jul|
|Thu, 24 Jul 17:21 UTC||M 0.9 / 8.1 km||29 km||34km SW of Mammoth Lakes, California|
|Wed, 23 Jul|
|Wed, 23 Jul 04:55 UTC||M 1.2 / 6.1 km||5 km||10km E of Mammoth Lakes, California|
|Wed, 23 Jul 04:55 UTC||M 0.4 / 17.8 km||4 km||7km ENE of Mammoth Lakes, California|
|Wed, 23 Jul 04:12 UTC||M 1.6 / 6.2 km||5 km||10km E of Mammoth Lakes, California|
|Wed, 23 Jul 02:54 UTC||M 0.8 / 9.3 km||15 km||15km ESE of Mammoth Lakes, California|
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.
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