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Bulletin of the Seismological Society of America; April 1997; v. 87; no. 2; p. 277-293
© 1997 Seismological Society of America
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Paleoseismicity of the north branch of the Newport-Inglewood fault zone in Huntington Beach, California, from cone penetrometer test data

Lisa B. Grant*, John T. Waggoner, Thomas K. Rockwell and Carmen von Stein

Division of Natural Sciences Chapman University, Orange, California 92668(714) 744-7697;(714) 532-6048Igrant{at}chapman.edu
Woodward-Clyde Consultants, 2020 E. First Street, Suite 400, Santa Ana, California 92705
Department of Geological Sciences San Diego State University, San Diego, California 92182
Central Washington University, Ellensburg, Washington 98926

Abstract

Application of cone penetrometer testing (CPT) is a promising method for studying subsurface fault zones in stratified, unconsolidated sediment where trenching is not feasible. Analysis of data from 72 CPTs, spaced 7.5 to 30.0 m apart, and 9 borings indicates that the North Branch fault, the active strand of the Newport-Inglewood fault zone (NIFZ) in Huntington Beach, has generated at least three and most likely five recognizable surface ruptures in the past 11.7 ± 0.7 ka. Additional smaller earthquakes similar to the Mw 6.4 1933 Long Beach earthquake may also have occurred but would not be recognizable with this method. The minimum right-lateral Holocene slip rate of the NIFZ in the study area is estimated to be 0.34 to 0.55 mm/yr. The actual slip rate may be significantly higher.

Footnotes

* Corresponding author.




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