Arid
DOI10.1093/gji/ggt113
The tectonic crustal stress field and style of faulting along the Pacific North America Plate boundary in Southern California
Yang, Wenzheng; Hauksson, Egill
通讯作者Yang, Wenzheng
来源期刊GEOPHYSICAL JOURNAL INTERNATIONAL
ISSN0956-540X
EISSN1365-246X
出版年2013
卷号194期号:1页码:100-117
英文摘要

We invert for the state of stress in the southern California crust using a catalogue of high quality earthquake focal mechanisms (1981-2010). The stress field is best resolved where seismicity rates are high and sufficient data are available to constrain the stress field across most of the region. From the stress field, we determine the maximum horizontal compressive stress (S-Hmax) orientations and the style of faulting across southern California. The trend of S-Hmax exhibits significant regional and local spatial heterogeneities. The regional trend of S-Hmax varies from north along the San Andreas system to NNE to the east in the Eastern California Shear Zone as well as to the west, within the Continental Borderland and the Western Transverse Ranges. The transition zones from one state of stress to the other occur over a distance of only a few kilometres, following a trend from Yucca Valley to Imperial Valley to the east, and the western edge of the Peninsular Ranges to the west. The local scale heterogeneities in the S-Hmax trend include NNW trends along the San Andreas Fault near Cajon Pass, Tejon Pass and the Cucapah Range, as well as NNE trends near the northern San Jacinto Fault and the Wheeler Ridge area. The style of faulting exhibits similar complexity, ranging from predominantly normal faulting in the high Sierra Nevada, to strike-slip faulting along the San Andreas system, to three consecutive bands of thrust faulting in the Wheeler Ridge area and the Western Transverse Ranges. The local variations in the style of faulting include normal faulting at the north end of the San Jacinto Fault and scattered areas of thrust faulting. The regional variations in the S-Hmax trends are very similar to the pattern of the GPS-measured maximum shortening axes of the surface strain rate tensor field although the strain field tends to be smoother and appears to capture some of the upper-mantle deformation field. The mean trend of S-Hmax departs about approximately 14 degrees to the east from the trend of the maximum shortening directions derived from anisotropy in the upper mantle.


英文关键词Seismicity and tectonics Continental margins: transform Dynamics: seismotectonics High strain deformation zones Crustal structure North America
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000320462300007
WOS关键词STRIKE-SLIP FAULTS ; SAN-ANDREAS FAULT ; FOCAL MECHANISMS ; SEISMIC ANISOTROPY ; COUPLED LITHOSPHERE ; TRANSVERSE RANGES ; REGIONAL STRESS ; BLOCK ROTATION ; MOJAVE-DESERT ; BENEATH
WOS类目Geochemistry & Geophysics
WOS研究方向Geochemistry & Geophysics
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/177396
作者单位CALTECH, Seismol Lab, Div Geol & Planetary Sci, Pasadena, CA 91125 USA
推荐引用方式
GB/T 7714
Yang, Wenzheng,Hauksson, Egill. The tectonic crustal stress field and style of faulting along the Pacific North America Plate boundary in Southern California[J],2013,194(1):100-117.
APA Yang, Wenzheng,&Hauksson, Egill.(2013).The tectonic crustal stress field and style of faulting along the Pacific North America Plate boundary in Southern California.GEOPHYSICAL JOURNAL INTERNATIONAL,194(1),100-117.
MLA Yang, Wenzheng,et al."The tectonic crustal stress field and style of faulting along the Pacific North America Plate boundary in Southern California".GEOPHYSICAL JOURNAL INTERNATIONAL 194.1(2013):100-117.
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