U.S. Geological Survey
Scientific Investigations Map 3045
Version 1.0

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

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


thumbnail view of map

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.

Download the map for this report as a 44" x 36" PDF file (sim3045_map.pdf; 3.1 MB).

Download the pamphlet for this report as a 34-page PDF file (sim3045_text.pdf; 824 kB).

Download the map as open-source VTP files for use with Paraview (sim3045_vtp.zip; 17 MB compressed file that opens into a 44.8-MB folder).

Download the map for use with the EarthVision™ 3D viewer (map.zip; 35.3 MB compressed file that opens into a 72.6-MB folder).

For questions about the content of this report, contact Geoff Phelps

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