Friday, September 26, 2014

Mammoth Mountain Long Valley Caldera- Huge EQ uptick

Hundreds of temblors have been recorded in an earthquake swarm that continues in the High Sierras. The event intensified late Thursday with the strongest measuring M3.9.

The epicenter has been placed 7-miles east of Mammoth Lakes. Mammoth Mountain is a lava dome complex on the southwest rim of Long Valley Caldera.

The swarm of quakes in and around the mountain is being tied to recent "volcanic unrest" marked by gas emissions, tree die-offs and intrusions of upward-moving sheets of rock, according to the USGS.

It is unclear whether the latest round of quakes is linked to volcanic unrest, but USGS spokeswoman Susan Garcia said the region is "pretty active."

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