It was interesting to read of processing mundane noise to produce an ultrasound image of the geology of Los Angeles. A big question in the state is the deep structure of San Francisco Bay. Clearly, the bay and the valleys extending to its northwest and southeast form a rift valley. But it’s difficult to observe faulting in the rocks because of the depth of sediment. Maybe the area could be probed ultrasonically.
Charles B. Warren San Francisco, Calif.
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