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High-Resolution Surface-Seismic Imaging Techniques for NEHRP Soil Profile Classifications and Earthquake Hazard Assessments in Urban Areas

By Robert A. Williams, William J. Stephenson, Jack K. Odum, and David M. Worley

U.S. Geological Survey Open-File Report 97-501

Version 1.0
The 17 January 1994 magnitude 6.7 Northridge earthquake caused widespread damage throughout the San Fernando Valley.  There were also well-defined zones of significantly higher levels of building damage in the valley, such as in Sherman Oaks and in the vicinity of the California State Northridge campus.  Previous aftershock site-response studies indicate that areas with extensive building damage are associated with high levels of ground motion amplification.  We acquired high-resolution seismic-refraction data on the ground surface in some of these areas to help explain the earthquake damage patterns and the variation in ground motion. 

OFR-97-501 HTML file
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