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Scenario liquefaction hazard maps of Santa Clara Valley, Northern California

Bulletin of the Seismological Society of America

By:
, , and
DOI: 10.1785/0120080227

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Abstract

Maps showing the probability of surface manifestations of liquefaction in the northern Santa Clara Valley were prepared with liquefaction probability curves. These curves were based on complementary cumulative frequency distributions of the liquefaction potential index (LPI) for surficial geologic units in the study area. LPI values were computed with extensive cone penetration test soundings. Maps were developed for three earthquake scenarios, an M 7.8 event on the San Andreas fault comparable to the 1906 event, an M 6.7 event on the Hayward fault comparable to the 1868 event, and an M 6.9 event on the Calaveras fault. Ground motions were estimated with the Boore and Atkinson (2008) attenuation relation. Liquefaction is predicted for all three events in young Holocene levee deposits along the major creeks. Liquefaction probabilities are highest for the M 7.8 earthquake, ranging from 0.33 to 0.37 if a 1.5 m deep water table is assumed, and from 0.10 to 0.14, if a 5 m deep water table is assumed. Liquefaction probabilities of the other surficial geologic units are less than 0.05. Probabilities for the scenario earthquakes are generally consistent with observations during historical earthquakes.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Scenario liquefaction hazard maps of Santa Clara Valley, Northern California
Series title:
Bulletin of the Seismological Society of America
DOI:
10.1785/0120080227
Volume
99
Issue:
1
Year Published:
2009
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Bulletin of the Seismological Society of America
First page:
367
Last page:
381
Number of Pages:
15