Earthquake Swarm Around San Francisco Persists
The U.S. Geological Survey reports that in the last two weeks more than 400 small earthquakes have hit a city east of San Francisco.
KNTV reported that the city of San Ramon appears to have broken an earthquake record with a total of 408 small quakes since Oct. 13.
Most of the quakes have clocked in with magnitudes ranging from 2.0 to 3.0. The largest was a 3.6-magnitude on Oct. 19.
The biggest swarm on record in the same general area was in 1990 in Alamo. That’s when 351 earthquakes struck over 42 days.
Related:
- 99.9 Percent Probability of L.A.-Area Earthquake: Study
- California Bill Requiring Earthquake Reports on Water Infrastructure Signed
- Quakes Still Rattling Area East of San Francisco