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Open-File Report 03-269

Isostatic Gravity Map with Simplified Geology of the Los Angeles 30 x 60 Minute Quadrangle

By R.J. Wooley, R.F. Yerkes, V.E. Langenheim, and F.C. Chuang

Thumbnail of and link to report PDF (3.4 MB)Abstract

This isostatic residual gravity map is part of the Southern California Areal Mapping Project (SCAMP) and is intended to promote further understanding of the geology in the Los Angeles 30 x 60 minute quadrangle, California, by serving as a basis for geophysical interpretations and by supporting both geological mapping and topical (especially earthquake) studies. Local spatial variations in the Earth's gravity field (after various corrections for elevation, terrain, and deep crustal structure explained below) reflect the lateral variation in density in the mid- to upper crust. Densities often can be related to rock type, and abrupt spatial changes in density commonly mark lithologic boundaries. The map shows contours of isostatic gravity overlain on a simplified geology including faults and rock types. The map is draped over shaded-relief topography to show landforms.

First posted July 7, 2003

For additional information, contact:
Geology, Minerals, Energy, and Geophysics Science Center
U.S. Geological Survey
345 Middlefield Road, MS 901
Menlo Park, CA 94025-3591

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Suggested citation:

Wooley, R. J., Yerkes, R. F., Langenheim, V. E., Chuang, F. C., 2003, Isostatic Gravity Map with Simplified Geology of the Los Angeles 30 x 60 Minute Quadrangle: U. S. Geological Survey Open-File Report 03-269,

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