Abstract
We made 29 in situ strain relaxation measurements distributed among eight sites spaced on a 35 km transect across the San Andreas fault and into the western Mojave desert southeast of Palmdale, California. Strain was measured by overcoring strain gauge rosettes bonded to the flattened bottom of boreholes. Our purpose was to measure the regional stress field and any modification of it by the San Andreas fault system. At our sites most distant from the fault we found NNE trending maximum com-pressive stress (01) which is parallel to the ai inferred from fault-plane solutions in southern California. There appears to be a clockwise rotation of ai from NNE to approximately east-west on the north side of the fault. On the south side of the fault, <∗i varies from N60#W to NNE. Along the 35 km transect <n varied from 2.5 b to 32.9 b.
| Original language | English (US) |
|---|---|
| Pages | 95-101 |
| Number of pages | 7 |
| State | Published - 1978 |
| Externally published | Yes |
| Event | 19th U.S. Symposium on Rock Mechanics, USRMS 1978 - Reno, United States Duration: May 1 1978 → May 3 1978 |
Conference
| Conference | 19th U.S. Symposium on Rock Mechanics, USRMS 1978 |
|---|---|
| Country/Territory | United States |
| City | Reno |
| Period | 5/1/78 → 5/3/78 |
ASJC Scopus subject areas
- Geochemistry and Petrology
- Geophysics