USGS ‘Closely Tracking’ Earthquake Swarm In Mammoth Lakes Volcanic Area

September 27, 2014 6:16 PM

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SAN FRANCISCO (CBS SF) — The United States Geological Survey announced on its website Friday it was “closely tracking” a swarm of hundreds of earthquakes that began Thursday, located in Long Valley about 7 miles east of the Sierra Nevada resort town of Mammoth Lakes.

The region, known to geologists as the Long Valley Caldera, is the site of one of North America’s greatest pre-historic eruptions and is surrounded by a chain of recently-active volcanos. Earthquake swarms are fairly common in the area.

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