The cluster of earthquakes that began Friday night in La Habra appear to have struck on a fault underneath the Puente Hills thrust fault, scientists said Wednesday.
Friday’s earthquake has not provoked earthquakes on either the main Puente Hills fault or the nearby Whittier fault.
Friday’s magnitude-5.1 quake “was relatively shallow and thus did not significantly perturb the parts of the Puente Hills thrust or the Whittier fault, where we expect a major earthquake to start,” said Caltech seismologist Egill Hauksson.
“Further, there were no small quakes triggered on either the Puente Hills thrust or the Whittier, indicating they remain locked,” Hauksson said.
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