| Abstract: | Preliminary measurements of the stress orientation at a depth of 2 km interpreted to indicate that the regional orientation of the maximum compression is normal to the fault, and taken as evidence for a very weak fault. The orientation expected from plate tectonic arguments is about 66?? NE from the strike of the fault. Geodetic data indicate that the orientation of maximum compressive strain rate is about 43?? NE from the strike of the fault, and show nearly pure right-lateral shear acting parallel to the fault. These apparent conflicts in the inferred orientation of the axis of maximum compression may be explained in part by a model in which the fault zone is locked over a depth interval in the range of 2-5 to 15 km, but is very weak above and below that interval. This solution does require, however, a few mm/yr of creep at the surface on the San Andreas or nearby sub-parallel faults (such as the San Jacinto), which has not yet been observed, or a shallow zone near the faults of distributed deformation. -from Author |
| Genre: | Article |
| ProdID: | 70014347 |
| Citation Author: | Wesson, R. L. |
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| Citation End Page: | 1012 |
| Citation Issue: | 9 |
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| Citation Language: | English |
| Citation Larger Work Title: | Geophysical Research Letters |
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| Citation Number Of Pages: | 4 |
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| Citation Search Results Text: | Predicted variation of stress orientation with depth near an active fault: application to the Cajon Pass Scientific Drillhole, southern California; 1988; Article; Journal; Geophysical Research Letters; Wesson, R. L. |
| Citation Start Page: | 1009 |
| Citation Volume: | 15 |
| Citation Year: | 1988 |
| Type: | citation/reference |
| Text: | Predicted variation of stress orientation with depth near an active fault: application to the Cajon Pass Scientific Drillhole, southern California; 1988; Article; Journal; Geophysical Research Letters; Wesson, R. L. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Fri, 1 Jan 1988 00:00 -0600 |
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