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Birth of a fault: Connecting the Kern County and Walker Pass, California, earthquakes

Geology

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Abstract

A band of seismicity transects the southern Sierra Nevada range between the northeastern end of the site of the 1952 MW (moment magnitude) 7.3 Kern County earthquake and the site of the 1946 MW 6.1 Walker Pass earthquake. Relocated earthquakes in this band, which lacks a surface expression, better delineate the northeast-trending seismic lineament and resolve complex structure near the Walker Pass mainshock. Left-lateral earthquake focal planes are rotated counterclockwise from the strike of the seismic lineament, consistent with slip on shear fractures such as those observed in the early stages of fault development in laboratory experiments. We interpret this seismic lineament as a previously unrecognized, incipient, currently blind, strike-slip fault, a unique example of a newly forming structure.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Birth of a fault: Connecting the Kern County and Walker Pass, California, earthquakes
Series title:
Geology
Volume
27
Issue:
7
Year Published:
1999
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Geology
First page:
601
Last page:
604
Number of Pages:
4