globalchange  > 气候减缓与适应
DOI: 10.1038/ngeo2017
论文题名:
Limit of strain partitioning in the Himalaya marked by large earthquakes in western Nepal
作者: Murphy M.A.; Taylor M.H.; Gosse J.; Silver C.R.P.; Whipp D.M.; Beaumont C.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2014
卷: 7, 期:1
起始页码: 38
结束页码: 42
语种: 英语
英文摘要: Great earthquakes and high seismic risk in the Himalaya are thought to be focussed near the range front, where the Indian Plate slides beneath the mountain range. However, the Himalaya is curved and plate convergence becomes increasingly oblique westwards. Strain in the western Himalaya is hypothesized to be partitioned, such that western parts move northwestwards with respect to the central Himalaya. Here we use field data to identify a 63-km-long earthquake rupture on a previously unrecognized fault in the western Himalaya, far from the range front. We use radiocarbon dating to show that one or more earthquakes created 10 m of surface displacement on the fault between AD 1165 and 1400. During this time interval, large range-front earthquakes also occurred. We suggest that the active fault we identified is part of a larger fault system, the Western Nepal Fault System, which cuts obliquely across the Himalaya. We combine our observations with a geodynamical model to show that the Western Nepal Fault System marks the termination of the strain-partitioned region of the western Himalaya and comprises a first-order structure in the three-dimensional displacement field of the mountain range. Our findings also identify a potential seismic hazard within the interior of the Himalaya that may necessitate significant changes to seismic hazard assessments. © 2014 Macmillan Publishers Limited.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106437
Appears in Collections:气候减缓与适应
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作者单位: Department of Earth and Atmospheric Sciences, University of Houston, Houston, TX 77204, United States; Department of Geology, University of Kansas, Lawrence, KS 66045, United States; Department of Earth Sciences, Dalhousie University, 1459 Oxford Street, Halifax, NS, B3H 4R2, Canada; Oceanography Department, Dalhousie University, 1459 Oxford Street, Halifax, NS, B3H 4R2, Canada; Institute of Seismology, Department of Geosciences and Geography, University of Helsinki, PO Box 68, FI-00014 Helsinki, Finland

Recommended Citation:
Murphy M.A.,Taylor M.H.,Gosse J.,et al. Limit of strain partitioning in the Himalaya marked by large earthquakes in western Nepal[J]. Nature Geoscience,2014-01-01,7(1)
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