Geophysical Studies of the San Francisco
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Gravity gradients commonly occur where faults have juxtaposed rocks of different densities. However, faults are not always marked by gravity gradients, as rocks of similar densities may be also juxtaposed along a fault.

Color contour map of isostatic residual gravity map.
Red colors, gravity highs; blue colors, gravity lows; black lines, mapped faults.
See the map: Roberts, C.W., and Jachens, R.C., 1993, Isostatic residual gravity map of the San Francisco Bay area, California: U.S. Geological Survey Geophysical Investigations Map GP-1006. Available from the USGS--Information Services, Box 25286, Bldg. 810, Denver Federal Center, Denver, CO 80225 303 236-4210.
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