Anomalous gravity field in east-central California

Geological Society of America Bulletin
By:  and 



Bouguer gravity values at about 11,000 stations in east-central California range from -14 mgal near Merced to -274 mgal in Long Valley. Gravity lows in the west and south parts of the San Joaquin Valley and over local basins south and east of the Sierra Nevada are produced by large thicknesses of Upper Cretaceous and Cenozoic deposits. A large regional gravity low over the Sierra Nevada can be explained by isostatic compensation of the range together with the effect of the relatively low-density rocks of the Sierra Nevada batholith. A broad gravity ridge along the east side of the San Joaquin Valley shows excellent correlation with a similar magnetic ridge where the two sets of data are available, suggesting that both anomalies are caused by a dense, magnetic mass buried at an estimated depth of 5-10 miles. Seismic refraction measurements further indicate that the thickness of the earth's crust under the valley is less than 12 miles. Thus, the anomalous mass is in the lower part of the earth's crust and is conceivably related to the more mafic rocks of the earth's upper mantle. 

Study Area

Publication type Article
Publication Subtype Journal Article
Title Anomalous gravity field in east-central California
Series title Geological Society of America Bulletin
DOI 10.1130/0016-7606(1963)74[1293:AGFIEC]2.0.CO;2
Volume 74
Issue 10
Year Published 1963
Language English
Publisher Geological Society of America
Description 6 p.
First page 1293
Last page 1298
Country California
Other Geospatial east-central California
Google Analytic Metrics Metrics page
Additional publication details