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Open-File Report 03-450

Photomosaics and Logs of Trenches on the San Andreas Fault at Arano Flat near Watsonville, California

By Thomas E. Fumal, Gordon F. Heingartner, Laura Samrad, Timothy E. Dawson, John C. Hamilton and John N. Baldwin

Thumbnail of and link to report PDF (10.4 MB)Introduction

We present photomosaics and logs of the walls of trenches excavated for a paleoseismic study at Arano Flat, one of two sites along the San Andreas fault in the Santa Cruz Mountains on the Kelley-Thompson Ranch. At this location, the fault consists of a narrow zone along the northeast side of a low ridge adjacent to a possible sag pond and extends about 60-70 meters across a broad alluvial flat. This site was a part of Rancho Salsipuedes beginning in 1834 and was purchased by the present owner’s family in 1851.

First posted December 2, 2003

For additional information, contact:
Earthquake Science Center, Menlo Park
U.S. Geological Survey
345 Middlefield Road MS 977
Menlo Park, California 94025

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Suggested citation:

Fumal, Thomas E., Heingartner, Gordon F., Samrad, Laura, Dawson, Timothy E., Hamilton, John C., Baldwin, John N., 2004, Photomosaics and Logs of Trenches on the San Andreas Fault at Arano Flat near Watsonville, California: U. S. Geological Survey Open-File Report 03-450,

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