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Open-File Report 02-353

Gravity map and data of the eastern half of the Big Bear Lake, 100,000 scale quadrangle, California and analysis of the depths of several basins

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spacer image Gravity surveys are useful tools for helping to understand the 3-dimensional geology of an area. Many gravity measurements were made in the 1960s and 1970s by various groups in order to produce gravity maps covering California at a scale of 1:250,000 for the California Division of Mines and Geology. (For this area see Biehler et. al. 1988.) More recent surveys have focused on specific areas and problems. This report includes new data on the southern portion of the Marine Corps Air Ground Combat Center (MCAGCC) Twentynine Palms and the Yucca Valley-Joshua Tree-Twentynine Palms area and presents the map and basin analyses that were prepared with these data.

Index map

This map shows the location of the MCAGCC with the area covered by the gravity map in red.

 

The gravity field, shown below as isostatic anomalies, reflects density variations of the Earth's upper and middle crust. Gravity highs occur over crystalline bedrock. Gravity lows occur over Cenozoic (younger) sedimentary rocks.

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 juxtaposed along a fault.

Isostatic residual gravity map.

Isostatic residual gravity map of the eastern half of the Big Bear Lake 100,000 quadrangle. Click on Gravity Map button for additional versions.

Click here to visit depth modeling page. 

This report is preliminary and has not been reviewed for conformity with U.S. Geological Survey editorial standards or with the North American Stratigraphic Code. Any use of trade, product, or firm names is for descriptive purposes and does not imply endorsement by the U.S. Government.

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