Imperial County, Calif., residents felt more than three dozen earthquakes on June 14, with magnitudes ranging up to 4.3. The first quake hit about seven miles northeast of El Centro with a preliminary magnitude of 4.2. It was followed by a series of aftershocks, including 14 above magnitude 3.0, within three hours. The Sheriff’s Department reported no damage.
With its location between the Arizona border and San Diego County, the Imperial Valley is California’s most active seismic region. Further north, the Ventura County community of Fillmore experienced more than 30 small earthquakes last week. The quakes registered less than magnitude 3.0 and caused no damage. The tremors were located in the vicinity of the Oak Ridge Fault system, where some seismologists believe the 1994 Northridge quake was triggered on the fault’s southern tip.
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