Today’s California earthquake lies in one of the most active knots of seismicity. The temblor struck at the junction of the major San Jacinto fault, which extends to the southeast, and the Cucamonga fault, extending to the west as part of the Sierra Madre fault zone. The California earthquake and its aftershocks also lie just 6 miles from the San Andreas fault, just to the north. All three faults are capable of Magnitude 7 or larger earthquakes, and all are highly active. For all of these reasons, the Temblor Seismic Hazard Rank of this location is 81 out of 100.
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