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Near-fault measurement of postseismic slip associated with the 1989 Loma Prieta, California, earthquake

Geophysical Research Letters

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Abstract

Five small-aperture (0.5 to 7.7 m) quadrilaterals were installed across the San Andreas fault and newly formed extensional cracks shortly after the October 17, 1989 Loma Prieta M7.1 earthquake. Measurements of line-length changes from as early as 4 d up to 184 d after the earthquake in nail quadrilaterals indicate a small amount of right-lateral postseismic slip on the San Andreas fault. The site near the southeast end of the 1989 aftershock zone on the San Andreas fault showed about 5??2 mm of postseismic right-lateral component of slip in addition to 23 mm of right-lateral coseismic movement. The site near the northwest end of aftershocks likewise showed about 5??2 mm of postseismic slip, but after only 5 mm of coseismic slip. The smal slip values, in spite of uncertainties, clearly show that the lack of coseismic surface slip associated with the earthquake was not followed by large postseismic slip. -from Author

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Near-fault measurement of postseismic slip associated with the 1989 Loma Prieta, California, earthquake
Series title:
Geophysical Research Letters
Volume
17
Issue:
10
Year Published:
1990
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Geophysical Research Letters
First page:
1789
Last page:
1792
Number of Pages:
4