HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) References Citation Map Services Email this article to a friend Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by WARRICK, R. E. Search for Related Content GeoRef GeoRef Citation

Seismic investigation of a san francisco bay mud site^*

NATIONAL CENTER FOR EARTHQUAKE RESEARCH U.S. GEOLOGICAL SURVEY, MENLO PARK, CALIFORNIA 94025

Abstract

Measurements were made of the shear- and compressional-wave velocities necessary to determine the seismic response of a site on the edge of the San Francisco Bay, California. The shear wave is the most difficult to isolate because of the complications of earlier arriving energy. Downhole and surface measurements yielded shear-wave velocities of 90 to 130 m/sec and compressional-wave velocities of 1,400 m/sec for soft mud. The underlying older sediments had interval shear-wave velocities of 270 to 380 m/sec, increasing with depth. The corresponding P velocities for the older sediments were 1,600 to 1,840 m/sec. The horizontal traction technique of shear-wave generation proved to be the most successful of the methods tested.

Footnotes

^* Publication authorized by the Director, U.S. Geological Survey.

This article has been cited by other articles:

				Estimated Ground Motion From the 1994 Northridge, California, Earthquake at the Site of the Interstate 10 and La Cienega Boulevard Bridge Collapse, West Los Angeles, California Bulletin of the Seismological Society of America, December 1, 2003; 93(6): 2737 - 2751.

				J. F. Gibbs, D. M. Boore, W. B. Joyner, and T. E. Fumal The attenuation of seismic shear waves in quaternary alluvium in Santa Clara Valley, California Bulletin of the Seismological Society of America, February 1, 1994; 84(1): 76 - 90. [Abstract] [PDF]

				H.-P. LIU, R. E. WARRICK, R. E. WESTERLUND, J. B. FLETCHER, and G. L. MAXWELL An air-powered impulsive shear-wave source with repeatable signals Bulletin of the Seismological Society of America, February 1, 1988; 78(1): 355 - 369. [Abstract] [PDF]

				P. M. SHEARER and J. A. ORCUTT Surface and near-surface effects on seismic waves--theory and borehole seismometer results Bulletin of the Seismological Society of America, August 1, 1987; 77(4): 1168 - 1196. [Abstract] [PDF]

				W. B. JOYNER, R. E. WARRICK, and T. E. FUMAL The effect of quaternary alluvium on strong ground motion in the Coyote Lake, California, earthquake of 1979 Bulletin of the Seismological Society of America, August 1, 1981; 71(4): 1333 - 1349. [Abstract] [PDF]

				D. J. Stierman, D. J. STIERMAN, and S. O. ZAPPE Lateral P-Velocity Gradients near Major Strike-Slip Faults in California Science, July 10, 1981; 213(4504): 207 - 209. [Abstract] [PDF]

				L. R. JOHNSON and W. SILVA The effects of unconsolidated sediments upon the ground motion during local earthquakes Bulletin of the Seismological Society of America, February 1, 1981; 71(1): 127 - 142. [Abstract] [PDF]

				W. B. JOYNER, R. E. WARRICK, and A. A. OLIVER III Analysis of seismograms from a downhole array in sediments near San Francisco Bay Bulletin of the Seismological Society of America, June 1, 1976; 66(3): 937 - 958. [Abstract] [PDF]

				W. B. JOYNER and A. T. F. CHEN Calculation of nonlinear ground response in earthquakes Bulletin of the Seismological Society of America, October 1, 1975; 65(5): 1315 - 1336. [Abstract] [PDF]

				W. B. JOYNER A method for calculating nonlinear seismic response in two dimensions Bulletin of the Seismological Society of America, October 1, 1975; 65(5): 1337 - 1357. [Abstract] [PDF]