The swarm lies 10 miles from the Sierra Madre Thrust Fault, and 12 miles from the San Jacinto Fault. Junctions of major fault are often the sites of secondary faults like this one appears to be.

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The swarm lies 10 miles from the Sierra Madre Thrust Fault, and 12 miles from the San Jacinto Fault. Junctions of major fault are often the sites of secondary faults like this one appears to be.

The swarm lies 10 miles from the Sierra Madre Thrust Fault, and 12 miles from the San Jacinto Fault. Junctions of major fault are often the sites of secondary faults like this one appears to be.

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