Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1130/0091-7613(2003)031<0327:TMFTSN>2.0.CO;2 |
Transtensional model for the Sierra Nevada frontal fault system, eastern California | |
Unruh, J; Humphrey, J; Barron, A | |
通讯作者 | Unruh, J |
来源期刊 | GEOLOGY |
ISSN | 0091-7613 |
出版年 | 2003 |
卷号 | 31期号:4页码:327-330 |
英文摘要 | Active strike-slip and normal faults along the eastern margin of the Sierra Nevada primarily accommodate northwestward translation of the Sierra Nevada-Central Valley (i.e., Sierran) microplate with respect to stable North America. Strike-slip faults bordering the eastern Sierran microplate are subparallel to small circles about the Sierra Nevada-North American Enter pole. Normal faults of the Sierra Nevada frontal fault system strike similar to45degrees clockwise of the small circle trajectories and exhibit well-defined, left-stepping en echelon patterns, consistent with formation in dextrall transcurrent regime. Major graben bordering the northeastern Sierran microplate are located in regions where the locus of rangefront deformation steps abruptly eastward in a releasing geometry relative to Sierra Nevada-North American motion. Crustal shortening occurs at the northern end of the Sierran microplate, where a component of northwest dextrall shear steps westward in a left-restraining geometry across the Sierran crest to the Sacramento Valley. Kinematic inversions of earthquake focal mechanisms from the Walker Lane belt bordering the eastern Sierra Nevada indicate that seismogenic deformation primarily is characterized by horizontal shearing and oblique crustal thinning. Directions of macroscopic dextral shear inferred from the inversions are subparallel to the trajectories of small circles about the Sierra Nevada-North American Euler pole. Normal faulting along most of the eastern Sierran range front thus appears to primarily accommodate microplate translation rather than Sierran uplift or regional Basin and Range extension. |
英文关键词 | Sierra Nevada Walker Lane neotectonics seismotectonics geodesy structure |
类型 | Article |
语种 | 英语 |
国家 | USA |
收录类别 | SCI-E |
WOS记录号 | WOS:000181928700010 |
WOS关键词 | WESTERN UNITED-STATES ; MOJAVE-DESERT ; SHEAR ZONE ; RANGE PROVINCE ; GREAT-BASIN ; DEFORMATION ; MOTION ; BLOCK ; PATTERNS ; VALLEY |
WOS类目 | Geology |
WOS研究方向 | Geology |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/144668 |
作者单位 | (1)William Lettis & Associates Inc, Walnut Creek, CA 94596 USA;(2)Lahontan GeoSci Inc, Reno, NV 89502 USA |
推荐引用方式 GB/T 7714 | Unruh, J,Humphrey, J,Barron, A. Transtensional model for the Sierra Nevada frontal fault system, eastern California[J],2003,31(4):327-330. |
APA | Unruh, J,Humphrey, J,&Barron, A.(2003).Transtensional model for the Sierra Nevada frontal fault system, eastern California.GEOLOGY,31(4),327-330. |
MLA | Unruh, J,et al."Transtensional model for the Sierra Nevada frontal fault system, eastern California".GEOLOGY 31.4(2003):327-330. |
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