High-Resolution Seismic-Reflection and Marine Magnetic Data Along the Hosgri Fault Zone, Central California

Ray W. Sliter,¹ Peter J. Triezenberg,¹ Patrick E. Hart,¹ Janet T. Watt,¹ Samuel Y. Johnson,² and Daniel S. Scheirer¹

2009, revised 2010

¹ U.S. Geological Survey, Menlo Park, Calif.
² U.S. Geological Survey, Santa Cruz, Calif.

Abstract

The U.S. Geological Survey collected high-resolution shallow seismic-reflection and marine magnetic data during the summers of 2008 and 2009 in the offshore areas between Piedras Blancas and Point Sal from the nearshore (~6 m depth) to just west of the Hosgri Fault Zone, in support of the Cooperative Research and Development Agreement (CRADA) between Pacific Gas and Electric Company and the U.S. Geological Survey.

Seismic-reflection and marine magnetic data were acquired aboard the R/V Parke Snavely using a SIG 2Mille mini-sparker seismic source and a Geometrics G882 cesium-vapor marine magnetometer. More than 3,100 km of seismic and marine magnetic data were collected simultaneously along shore-perpendicular transects spaced 800 m apart, with an additional 1,340 km of marine magnetometer data collected at 400 m line spacing.

This report includes maps of the seismic survey transects, linked to Google Earth™ software, and digital data files showing images of each transect in SEG-Y, JPEG, and TIFF formats, as well as a preliminary gridded marine magnetic anomaly and residual magnetic anomaly (shallow magnetic source) maps.

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Suggested citation:
Sliter, Ray W., Triezenberg, Peter J., Hart, Patrick E., Watt, Janet T., Johnson, Samuel Y., and Scheirer, Daniel S., 2009, revised 2010, High-resolution seismic reflection and marine magnetic data along the Hosgri Fault Zone, central California: U.S. Geological Survey Open-File Report 2009-1100, version 1.1 [https://pubs.usgs.gov/of/2009/1100/].

U.S. Department of the Interior
KEN SALAZAR, Secretary

U.S. Geological Survey
Marcia K. McNutt, Director