Ever since the great earthquake of 1906, scientists have been predicting that the city of San Francisco, perched precariously over the San Andreas fault, would some day be hit by another devastating tremor. Reuben Greenspan, 69, was not nearly so vague as that. Operating on a long-standing theory that certain relative positions of the sun and moon can exert catalytic—and predictable—pressures on the earth's surface, Greenspan announced in 1971 that an earthquake would strike the city on Jan. 4, 1973 at 9:20 a.m. Last week Greenspan delphically hedged on his prediction, saying...
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