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Science Tour - 3D/4D mapping of the San Andreas Fault Zone

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Gravity mapping: The gravity field, in conjunction with surface geology, well data, seismic reflection and refraction profiling, and other subsurface data, is used to define the 3-D location and shape of the contact between the Cenozoic deposits (mostly poorly consolidated sediments) and the pre-Cenozoic bedrock. This contact, which typically is a strong density contrast in the San Francisco Bay area, displays substantial relief, especially in the Cupertino and Evergreen basins. Satellite image of the Southern San Francisco Bay region
Gravity field map of the southern San Francisco Bay region
Image source: Jachens, R. C., Wentworth, C. M., Gautier, D. L., and Pack, S., 2001, 3D Geologic Maps and Visualization: A New Approach to the Geology of the Santa Clara (Silicon) Valley, California: U.S. Geological Survey Open-File Report 01-223. http://pubs.usgs.gov/of/2001/of01-223/
Geologic map of the southern San Francisco Bay region
Earthquakes in the southern San Francisco Bay region
Gravity map of the southern San Francisco Bay region
3D geologic model of the southern San Francisco Bay region
3D geologic model
Lithology and geologic models Digital elevation model (DEM) of the southern San Francisco Bay region Magnetism map of the southern San Francisco Bay region

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