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Map showing depth to top of the principal aquifer, Sugar House quadrangle, Salt Lake County, Utah, February 1972 Map showing depth to top of the principal aquifer, Sugar House quadrangle, Salt Lake County, Utah, February 1972
The depth to the top of the principal aquifer in the Sugar House quadrangle ranges from about 50 feet to more than 400 feet below land surface. The principal aquifer supplied about 4 percent, or 9,000 acre-feet, of the municipal and industrial water used annually in Salt Lake County curing 1964-68. The least depths occur in topographically low areas of the Jordan Valley, such as near...
Map showing evidence for recent fault activity in the vicinity of Antioch, Contra Costa County, California Map showing evidence for recent fault activity in the vicinity of Antioch, Contra Costa County, California
The U.S. Geological Survey, in cooperation with other federal, state, and local agencies, is studying active and potentially active faults in the counties surrounding San Francisco Bay as past of a program to define and clarify geologic hazards in the region. Much more detailed information about known faults has been collected; in addition, poorly known or previously unknown zones of...