Triggered slip along the San Andreas fault after the 8 July 1986 North Palm Springs earthquake
In addition to minor surface cracks in the region of the 8 July 1986 North Palm Springs earthquake, minor aseismic surficial rupture occurred along three segments of the San Andreas fault, 44 to 86 km southeast of the epicenter. Data from a creepmeter and a tiltmeter at one locality suggest that tri...
| Main Authors: | , , , , |
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| Format: | Journal Article |
| Language: | English |
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2013
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| Online Access: | https://hdl.handle.net/10356/90364 http://hdl.handle.net/10220/9365 |
| _version_ | 1824454128461414400 |
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| author | Williams, Patrick L. McGill, Sally Fagerson Sieh, Kerry Allen, Clarence R. Louie, John N. |
| author_facet | Williams, Patrick L. McGill, Sally Fagerson Sieh, Kerry Allen, Clarence R. Louie, John N. |
| author_sort | Williams, Patrick L. |
| collection | NTU |
| description | In addition to minor surface cracks in the region of the 8 July 1986 North Palm Springs earthquake, minor aseismic surficial rupture occurred along three segments of the San Andreas fault, 44 to 86 km southeast of the epicenter. Data from a creepmeter and a tiltmeter at one locality suggest that triggered slip occurred coseismically beneath the instruments but took 33 hr to propagate to the surface. That slippage occurred coseismically at depth favors mechanisms for triggered slip that involve dynamic or static strain changes rather than creep migrating from the source region.
The distribution of slip along the San Andreas fault associated with the North Palm Springs earthquake differed significantly from that recorded after the moderate 1968 Borrego Mountain, California and 1979 Imperial Valley, California, earthquakes. During these earthquakes, triggered slip occurred along the San Andreas fault in the Durmid Hill area and in the Mecca Hills. Triggered slip associated with the North Palm Springs earthquake occurred in these two areas again, but also extended farther northwest into the Indio Hills, where as much as 9 mm of dextral slip occurred. In the Mecca Hills, surface cracks in 1986 appeared over a shorter fault length than in previous events, and the dextral displacement was smaller, with maximum values of only 2 to 3 mm. On Durmid Hill, surface cracks in 1986 were localized along a 200-m-long stretch of the fault spanning the Mecca Beach creepmeter and extending about 150 m to the southeast. Right-lateral displacements on surface cracks in this area were 1.4 to 2.0 mm, smaller than those observed in previous events.
Although the mechanism of triggered aseismic slip is poorly understood, examination of displacement rates for the past several decades to centuries may indicate whether the aseismic slip rate is constant or represents accelerating premonitory failiure of the southernmost San Andreas fault. |
| first_indexed | 2025-02-19T03:17:23Z |
| format | Journal Article |
| id | ntu-10356/90364 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2025-02-19T03:17:23Z |
| publishDate | 2013 |
| record_format | dspace |
| spelling | ntu-10356/903642019-12-06T17:46:32Z Triggered slip along the San Andreas fault after the 8 July 1986 North Palm Springs earthquake Williams, Patrick L. McGill, Sally Fagerson Sieh, Kerry Allen, Clarence R. Louie, John N. In addition to minor surface cracks in the region of the 8 July 1986 North Palm Springs earthquake, minor aseismic surficial rupture occurred along three segments of the San Andreas fault, 44 to 86 km southeast of the epicenter. Data from a creepmeter and a tiltmeter at one locality suggest that triggered slip occurred coseismically beneath the instruments but took 33 hr to propagate to the surface. That slippage occurred coseismically at depth favors mechanisms for triggered slip that involve dynamic or static strain changes rather than creep migrating from the source region. The distribution of slip along the San Andreas fault associated with the North Palm Springs earthquake differed significantly from that recorded after the moderate 1968 Borrego Mountain, California and 1979 Imperial Valley, California, earthquakes. During these earthquakes, triggered slip occurred along the San Andreas fault in the Durmid Hill area and in the Mecca Hills. Triggered slip associated with the North Palm Springs earthquake occurred in these two areas again, but also extended farther northwest into the Indio Hills, where as much as 9 mm of dextral slip occurred. In the Mecca Hills, surface cracks in 1986 appeared over a shorter fault length than in previous events, and the dextral displacement was smaller, with maximum values of only 2 to 3 mm. On Durmid Hill, surface cracks in 1986 were localized along a 200-m-long stretch of the fault spanning the Mecca Beach creepmeter and extending about 150 m to the southeast. Right-lateral displacements on surface cracks in this area were 1.4 to 2.0 mm, smaller than those observed in previous events. Although the mechanism of triggered aseismic slip is poorly understood, examination of displacement rates for the past several decades to centuries may indicate whether the aseismic slip rate is constant or represents accelerating premonitory failiure of the southernmost San Andreas fault. 2013-03-08T03:55:45Z 2019-12-06T17:46:32Z 2013-03-08T03:55:45Z 2019-12-06T17:46:32Z 1988 1988 Journal Article Williams, P. L., Mcgill, S. F., Sieh, K., Allen, C. R., & Louie, J. N. (1988). Triggered slip along the San Andreas fault after the 8 July 1986 North Palm Springs earthquake. Bulletin of the Seismological Society of America, 78(3), 1112-1122. 0037-1106 https://hdl.handle.net/10356/90364 http://hdl.handle.net/10220/9365 en Bulletin of the Seismological Society of America © 1988 Seismological Society of America |
| spellingShingle | Williams, Patrick L. McGill, Sally Fagerson Sieh, Kerry Allen, Clarence R. Louie, John N. Triggered slip along the San Andreas fault after the 8 July 1986 North Palm Springs earthquake |
| title | Triggered slip along the San Andreas fault after the 8 July 1986 North Palm Springs earthquake |
| title_full | Triggered slip along the San Andreas fault after the 8 July 1986 North Palm Springs earthquake |
| title_fullStr | Triggered slip along the San Andreas fault after the 8 July 1986 North Palm Springs earthquake |
| title_full_unstemmed | Triggered slip along the San Andreas fault after the 8 July 1986 North Palm Springs earthquake |
| title_short | Triggered slip along the San Andreas fault after the 8 July 1986 North Palm Springs earthquake |
| title_sort | triggered slip along the san andreas fault after the 8 july 1986 north palm springs earthquake |
| url | https://hdl.handle.net/10356/90364 http://hdl.handle.net/10220/9365 |
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