Magnitude 4.0 Earthquake Strikes Mammoth Lakes Area

MAMMOTH LAKES (CBS SF) -- A earthquake registering a preliminary magnitude of 4.0 struck near Mammoth Lakes Sunday, according to the U.S. Geological Survey's automated seismograph alert network.

The quake hit shortly after 5 p.m. Sunday in an a volcanic area Southeast of Mammoth Lakes, which saw a swarm of quakes earlier this year.

The quake struck an estimated depth of 7 km below the earth's surface. Deeper quakes are less noticeable while a shallow quake--in the 0 to 40 mile depth range--can feel much stronger than their actual reported magnitude. Quakes just below the earth's surface, in the 0 to 10 miles range, can cause even more damage at lower magnitudes.

COMPLETE QUAKE COVERAGE: CBS Earthquake Resource Center

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BAY AREA FAULTS: Interactive Map Of Local Faults

Strong earthquakes with an epicenter off the coast can trigger tsunamis, depending on the size and type of the fault movement. The Pacific Tsunami Warning Center tracks earthquake data for the West Coast.
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