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Land Subsidence in the San Joaquin Valley

July 1977 (approx.)

Detailed Description

Approximate point of maximum subsidence in the San Joaquin Valley, California. Land surface subsided ~9 m from 1925 to 1977 due to aquifer-system compaction. Signs on the telephone pole indicate the former elevations of the land surface in 1925 and 1955.

Photograph by Richard Ireland, U.S. Geological Survey


Public Domain.