More Than 120 Earthquakes Rattle Mammoth Lakes Area In California’s Long Valley Caldera With Largest Measuring M5.2

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Earthquake swarm near Mono Lake in California's Long Valley Caldera in April 2020, Earthquake swarm near Mono Lake in California's Long Valley Caldera in April 2020 video, Earthquake swarm near Mono Lake in California's Long Valley Caldera in April 2020 map
Earthquake swarm near Mono Lake in California’s Long Valley Caldera in April 2020. Earthquake map via USGS

A series of earthquakes is currently rattling the Mammoth Lakes area of eastern California.

The seismic activity began at 7:36 a.m. with a M5.2 temblor, which was felt in parts of the Central Valley and into the San Francisco Bay Area.

That quake was centered near Mono Lake and the historic ghost town of Bodie (18 miles SSE) and hit at a depth of about 6.3 miles.

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M5.2 earthquake rattles Mono Lake area in California Long Valley Caldera. Earthquake Map via USGS

It was followed by a series of aftershocks, including a M4.6 and a M4.1.

Minor shaking was reported across a wide part of California (from Fresno to Sacramento) and eastern Nevada.

There were no reports of damage or injuries.

The Long Valley Caldera earthquake Risks

The 16 x 32 km (20 x 10 mi) Long Valley caldera east of the central Sierra Nevada Range formed as a result of the voluminous Bishop Tuff eruption (considered a “supereruption”) about 760,000 years ago.

The caldera remains thermally active, with many hot springs and fumaroles, and has had significant deformation, seismicity, and other unrest in recent years.

A robust geothermal system inside the caldera fuels the Casa Diablo power plant, which generates enough power for 40,000 homes.

Both Long Valley Caldera and Mammoth Mountain have experienced episodes of heightened unrest over the last few decades (earthquakes, ground uplift, and/or volcanic gas emissions).

The most recent activity in the area was about 300 years ago in Mono Lake.

Earthquake expert Lucy Jones said: “Current quake cluster east of Mono Lake is an area that has at times had very energetic sequences with multiple larger events, so we won’t be surprised at more events today.

In 1915 and 1954 there were M~7 events to the north of here. Luckily most of the faults are far from towns.

Is this intense earthquake swarm announces an incoming geological disaster in that region of California?

More End Times Headlines on Strange Sounds and Steve Quayle. [Your Central Valley, CBS Local, LA Times]

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