Post-seismic slip on the San Andreas fault at the northwestern end of the 1989 Loma Prieta earthquake rupture zone
A small geodetic network spanning the San Andreas fault was measured 7, 77, 157, and 200 days following the October 17, 1989 Loma Prieta M7.1 earthquake. This network is located at the northwestern end of the rupture plane defined by the locations of numerous aftershocks. In the initial 70-day interval, the measured line-length changes revealed that 5.4 {plus minus} 0.4 mm of right-lateral slip occurred within the network. However, during the later 4 month interval only a marginally significant rate, 3.2 {plus minus} 1.4 mm/yr, of right-lateral slip could be detected. Thus, it appears that the measured slip is a typical response of the fault following a major shock in that the rate of slip decreases rapidly with time. However, the magnitude of the post-seismic slip is less than 0.5% of the inferred co-seismic slip at depth.
- OSTI ID:
- 6400681
- Journal Information:
- Geophysical Research Letters (American Geophysical Union); (USA), Journal Name: Geophysical Research Letters (American Geophysical Union); (USA) Vol. 17:8; ISSN 0094-8276; ISSN GPRLA
- Country of Publication:
- United States
- Language:
- English
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Near-fault measurement of postseismic slip associated with the 1989 Loma Prieta, California, earthquake
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