Paleoseismicity of the north branch of the Newport-Inglewood fault zone in Huntington Beach, California, from cone penetrometer test data
Document Type
Article
Department or Administrative Unit
Geological Sciences
Publication Date
4-1-1997
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.
Recommended Citation
Grant, L.B., Waggoner, J. T., Rockwell, T. K., & von Stein, C. (1997). Paleoseismicity of the north branch of the Newport-Inglewood fault zone in Huntington Beach, California, from cone penetrometer test data. Bulletin of the Seismological Society of America, 87(2), 277-293.
Journal
Bulletin of the Seismological Society of America
Rights
© 1997 Seismological Society of America
Comments
This article was originally published in Bulletin of the Seismological Society of America. The full-text article from the publisher can be found here.
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