DOI: 10.1002/2015GL067140
论文题名: Source model of the 2015 Mw 6.4 Pishan earthquake constrained by interferometric synthetic aperture radar and GPS: Insight into blind rupture in the western Kunlun Shan
作者: He P. ; Wang Q. ; Ding K. ; Wang M. ; Qiao X. ; Li J. ; Wen Y. ; Xu C. ; Yang S. ; Zou R.
刊名: Geophysical Research Letters
ISSN: 0094-9362
EISSN: 1944-9093
出版年: 2016
卷: 43, 期: 4 起始页码: 1511
结束页码: 1519
语种: 英语
英文关键词: GPS
; InSAR
; Pishan earthquake
; source model
Scopus关键词: Earthquakes
; Faulting
; Geochronology
; Geodesy
; Geodetic satellites
; Geophysics
; Global positioning system
; Radar imaging
; Tectonics
; Deformation front
; Epicentral region
; Finite fault modeling
; Ground displacement
; InSAR
; Interferometric synthetic aperture radars
; Maximum displacement
; Source modeling
; Synthetic aperture radar
; ALOS
; coseismic process
; decollement
; deformation mechanism
; earthquake epicenter
; earthquake rupture
; GPS
; interferometry
; numerical method
; numerical model
; Paleozoic
; satellite imagery
; slab
; strike (geology)
; subduction
; synthetic aperture radar
; thrust
; China
; Kunlun Mountains
; PLT Plateau
; Qinghai-Xizang Plateau
; Tarim Basin
; Xinjiang Uygur
英文摘要: The Pishan, Xinjiang, earthquake on 3 July 2015 is the one of largest events (Mw 6-7) that has occurred along the western Kunlun Shan, northwestern edge of the Tibetan Plateau in recent time. It involved blind thrusting at a shallow depth beneath the range front, providing a rare chance to gain insights into the interaction between the Tarim Basin and the Tibetan Plateau. Here we present coseismic ground displacements acquired by high-resolution ALOS-2 SAR imagery and derived from GPS resurveys on several near-field geodetic markers after the event. We observed a maximum displacement exceeding 10 cm in the epicentral region. Analysis of the data based on a finite fault model indicates that coseismic slip occurred on a subsurface plane of 22 km à 8 km in size with a dip of about 27° to the north and a strike of 114°, representing partial break of one ramp fault buried in Paleozoic strata at 8-16 km depths beneath the foothill of the western Kunlun Shan. This blind rupture is characterized largely by a compact thrusting patch with a peak slip of 0.63 m, resulting in a stress drop of 2.3 MPa. The source model yields a geodetic moment of 5.05 à 1018 N · m, corresponding to Mw 6.4. The Pishan earthquake suggests a northward migration of deformation front of the Tibetan Plateau onto the Tarim Basin. Our finding highlights slip along ramp-décollement faults to build up the western Kunlun Shan as the Tarim slab is subducting beneath western Tibet. ©2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84975764635&doi=10.1002%2f2015GL067140&partnerID=40&md5=75531600701111bd8e08289d0276526e
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/10325
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Hubei Subsurface Multi-Scale Imaging Key Laboratory, Institute of Geophysics and Geomatics, China University of Geosciences, Wuhan, China
Recommended Citation:
He P.,Wang Q.,Ding K.,et al. Source model of the 2015 Mw 6.4 Pishan earthquake constrained by interferometric synthetic aperture radar and GPS: Insight into blind rupture in the western Kunlun Shan[J]. Geophysical Research Letters,2016-01-01,43(4).