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DOI | 10.1002/2017GL072581 |
Structure and geometry of the Aksay restraining double bend along the Altyn Tagh Fault, northern Tibet, imaged using magnetotelluric method | |
Xiao, Qibin1; Yu, Guo1; Jing Liu-Zeng1; Oskin, Michael E.2; Shao, Guihang3 | |
2017-05-16 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS
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ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2017 |
卷号 | 44期号:9 |
文章类型 | Article |
语种 | 英语 |
国家 | Peoples R China; USA |
英文摘要 | Large restraining bends along active strike-slip faults locally enhance the accumulation of clamping tectonic normal stresses that may limit the size of major earthquakes. In such settings, uncertain fault geometry at depth limits understanding of how effectively a bend arrests earthquake ruptures. Here we demonstrate fault imaging within a major restraining bend along the Altyn Tagh Fault of western China using the magnetotelluric (MT) method. The new MT data were collected along two profiles across the Aksay restraining double bend, which is bounded by two subparallel strands of the Altyn Tagh Fault: Northern (NATF) and Southern (SATF). Both two-dimensional (2-D) and three-dimensional (3-D) inversion models show that the Aksay bend may be the center of a positive flower structure, imaged as a high-resistivity body extending to an similar to 40km depth and bounded by subvertical resistivity discontinuities corresponding to the NATF and SATF. In the western section of the Aksay bend, both the NATF and SATF show similar low-resistivity structure, whereas in the eastern part of the bend, the low-resistivity anomaly below the SATF is wider and more prominent than that below the NATF. This observation indicates that the SATF shear zone may be wider and host more fluid than the NATF, lending structural support to the contention that fault slip at depth is asymmetrically focused on the SATF, even though surface slip is focused on the NATF. A south dipping, low-resistivity interface branching upward from the SATF toward the NATF indicates a fault link between these strands at depth. |
英文关键词 | magnetotellurics Aksay restraining double bend Altun Shan Altyn Tagh Fault northern Tibet |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000402143700016 |
WOS关键词 | SAN-ANDREAS FAULT ; ELECTRICAL-RESISTIVITY STRUCTURES ; STRIKE-SLIP FAULTS ; TECTONIC IMPLICATIONS ; GALVANIC DISTORTION ; NW CHINA ; PLATEAU ; CALIFORNIA ; INVERSION ; CONSTRAINTS |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/28690 |
专题 | 气候变化 |
作者单位 | 1.China Earthquake Adm, Inst Geol, State Key Lab Earthquake Dynam, Beijing, Peoples R China; 2.Univ Calif Davis, Dept Earth & Planetary Sci, Davis, CA 95616 USA; 3.Ocean Univ China, Qingdao, Peoples R China |
推荐引用方式 GB/T 7714 | Xiao, Qibin,Yu, Guo,Jing Liu-Zeng,et al. Structure and geometry of the Aksay restraining double bend along the Altyn Tagh Fault, northern Tibet, imaged using magnetotelluric method[J]. GEOPHYSICAL RESEARCH LETTERS,2017,44(9). |
APA | Xiao, Qibin,Yu, Guo,Jing Liu-Zeng,Oskin, Michael E.,&Shao, Guihang.(2017).Structure and geometry of the Aksay restraining double bend along the Altyn Tagh Fault, northern Tibet, imaged using magnetotelluric method.GEOPHYSICAL RESEARCH LETTERS,44(9). |
MLA | Xiao, Qibin,et al."Structure and geometry of the Aksay restraining double bend along the Altyn Tagh Fault, northern Tibet, imaged using magnetotelluric method".GEOPHYSICAL RESEARCH LETTERS 44.9(2017). |
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