Three-Dimensional Geologic Map of the Hayward Fault Zone, San Francisco Bay Region, California

Phelps, G. A.; Graymer, R. W.; Jachens, R. C.; Ponce, D. A.; Simpson, R. W.; Wentworth, C. M.

Abstract:

A three-dimensional (3D) geologic map of the Hayward Fault zone was created by integrating the results from geologic mapping, potential field geophysics, and seismology investigations. The map volume is 100 km long, 20 km wide, and extends to a depth of 12 km below sea level. The map volume is oriented northwest and is approximately bisected by the Hayward Fault. The complex geologic structure of the region makes it difficult to trace many geologic units into the subsurface. Therefore, the map units are generalized from 1:24,000-scale geologic maps. Descriptions of geologic units and structures are offered, along with a discussion of the methods used to map them and incorporate them into the 3D geologic map. The map spatial database and associated viewing software are provided. Elements of the map, such as individual fault surfaces, are also provided in a non-proprietary format so that the user can access the map via open-source software. The sheet accompanying this manuscript shows views taken from the 3D geologic map for the user to access. The 3D geologic map is designed as a multi-purpose resource for further geologic investigations and process modeling.

Genre:

USGS Numbered Series

ProdID:

86663

Citation Author:

Phelps, G. A.; Graymer, R. W.; Jachens, R. C.; Ponce, D. A.; Simpson, R. W.; Wentworth, C. M.

Citation Contributing Office:

USGS Geophysical Unit of Menlo Park, California (GUMP)

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Citation Edition:

Version 1.0

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Citation Language:

ENGLISH

Citation Larger Work Title:

Citation LatN:

0382400

Citation LatS:

0371200

Citation LonE:

-1213600

Citation LonW:

-1223600

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Citation Phsyical Description:

Report: 34 p.; Map: 46 x 36 inches

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Citation Publisher:

Geological Survey (U.S.)

Citation Series:

Scientific Investigations Map

Citation Series Code:

SIM

Citation Series Number:

3045

Citation Search Results Text:

Three-Dimensional Geologic Map of the Hayward Fault Zone, San Francisco Bay Region, California; 2008; SIM; 3045; Phelps, G. A.; Graymer, R. W.; Jachens, R. C.; Ponce, D. A.; Simpson, R. W.; Wentworth, C. M.