Compression directions north of the San Fernando Valley determined from borehole breakouts

被引：11

作者：

Kerkela, S ^{[1
]}

Stock, JM ^{[1
]}

机构：

[1] CALTECH, SEISMOL LAB, PASADENA, CA 91125 USA

来源：

GEOPHYSICAL RESEARCH LETTERS | 1996年 / 23卷 / 23期

关键词：

D O I：

10.1029/96GL03054

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

Borehole breakouts in 4 nearly vertical oil wells, and several other deviated holes, in the San Fernando Valley and Santa Susana Mountains suggest a maximum horizontal compressive stress direction (S-H) of N49 degrees W. These wells provide information about the stress field from 1974 to 1983 in the uppermost crust (< 3 km depth) near the aftershock zones of the January 1994 Northridge earthquake and the February 1971 Sylmar earthquake. This direction of S-H is anomalous with respect to the N to NNE directions of S-H Seen in other regional data, but is consistent with the structural complexity of this zone, including local changes in strike of major thrust fault zones and the presence of lateral ramps in both the Santa Susana and San Fernando faults.

引用

页码：3365 / 3368

页数：4

共 20 条

[1]

ALLEN CR, 1972, CALIF DIV MINES GEOL, V196, P257

[2]

BARROWS AG, 1975, CALIF DIV MINES GEOL, V196

[3] STRESS PERTURBATIONS ASSOCIATED WITH ACTIVE FAULTS PENETRATED BY BOREHOLES - POSSIBLE EVIDENCE FOR NEAR-COMPLETE STRESS DROP AND A NEW TECHNIQUE FOR STRESS MAGNITUDE MEASUREMENT [J].