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.
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).
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.
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.
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
According to Earthquake-Report, the recently elevated seismicity in the area may be related to / have been energized by the large M7.7 Haida Gwaii earthquake west of British Colombia, Canada, on 28 Oct. [less]
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
(extension) across the volcano. Such deep low-frequency events occur in the middle to lower crust and are believed to be caused by the transit of magma or magmatic fluids upward beneath volcanoes. Such episodes at Mammoth may be followed (within days to weeks) by shallow earthquake swarms. [less]
