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Open-File Report 02-373

Isostatic gravity map of the Monterey 30 x 60 minute quadrangle and adjacent areas, California

By V.E. Langenheim, S.R. Stiles, and R.C. Jachens

Thumbnail of and link to report PDF (13.6 MB)Summary

The digital dataset consists of one file (monterey_100k.iso) containing 2,385 gravity stations. The file, monterey_100k.iso, contains the principal facts of the gravity stations, with one point coded per line. The format of the data is described below.

Each gravity station has a station name, location (latitude and longitude, NAD27 projection), elevation, and an observed gravity reading. The data are on the IGSN71 datum and the reference ellipsoid is the Geodetic Reference System 1967 (GRS67). The free-air gravity anomalies were calculated using standard formulas (Telford and others, 1976). The Bouguer, curvature, and terrain corrections were applied to the free-air anomaly at each station to determine the complete Bouguer gravity anomalies at a reduction density of 2.67 g/cc. An isostatic correction was then applied to remove the long-wavelength effect of deep crustal and/or upper mantle masses that isostatically support regional topography.

First posted November 11, 2002

  • Map EPS (73 MB)
    Download the map as an encapsulated PostScript file (77.3 MB).

The National Geologic Map Database has additional data about this publication

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:

Langenheim, V. E., Stiles, S. R., Jachens, R. C., 2002, Isostatic gravity map of the Monterey 30 x 60 minute quadrangle and adjacent areas, California: U.S. Geological Survey Open-File Report 02-373,

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