Seismic increase off California alarms earthquake experts
Seismologist explains alarm caused by activity from San Andreas fault line on 'Happening Now'
SAN DIEGO – California emergency officials say a period of elevated risk of a large earthquake on the San Andreas Fault is over.
The update Tuesday by the Governor's Office of Emergency Services came a week after a series of small jolts under the Salton Sea in Southern California near the 800-mile-long fault.
The U.S. Geological Survey had said the swarm temporarily increased the risk of a bigger earthquake, but that risk quickly decreased over time. The largest quake in the swarm was a magnitude 4.3.
Earthquake swarms have occurred under the Salton Sea in the past.
The last time the southernmost section of the San Andreas Fault ruptured was in 1680, more than 330 years ago.
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