Precariously balanced rocks, common throughout the desert southwest, and near the San Andreas Fault, place constraints on the ground shaking that could have occurred in the last several thousand years. This information is important in designing buildings to resist earthquakes.

PLEASE: If you find an apparently precariously balanced rock, please do not disturb it. Valuable information could otherwise be lost. But, please report them to us. For detail, check the link below "To be part of this research."

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