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Seismic reflection evidence for a northeast-dipping Hayward fault near Fremont, California: Implications for seismic hazard

Geophysical Research Letters

By:
, , , , , and
DOI: 10.1029/2005GL023113

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Abstract

A 1.6-km-long seismic reflection profile across the creeping trace of the southern Hayward fault near Fremont, California, images the fault to a depth of 650 m. Reflector truncations define a fault dip of about 70 degrees east in the 100 to 650 m depth range that projects upward to the creeping surface trace, and is inconsistent with a nearly vertical fault in this vicinity as previously believed. This fault projects to the Mission seismicity trend located at 4-10 km depth about 2 km east of the surface trace and suggests that the southern end of the fault is as seismically active as the part north of San Leandro. The seismic hazard implication is that the Hayward fault may have a more direct connection at depth with the Calaveras fault, affecting estimates of potential event magnitudes that could occur on the combined fault surfaces, thus affecting hazard assessments for the south San Francisco Bay region.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Seismic reflection evidence for a northeast-dipping Hayward fault near Fremont, California: Implications for seismic hazard
Series title:
Geophysical Research Letters
DOI:
10.1029/2005GL023113
Volume
32
Issue:
13
Year Published:
2005
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Geophysical Research Letters
First page:
1
Last page:
4