DOI: 10.1002/2015GL063750
论文题名: Joint analysis of the 2014 Kangding, southwest China, earthquake sequence with seismicity relocation and InSAR inversion
作者: Jiang G. ; Wen Y. ; Liu Y. ; Xu X. ; Fang L. ; Chen G. ; Gong M. ; Xu C.
刊名: Geophysical Research Letters
ISSN: 0094-9391
EISSN: 1944-9122
出版年: 2015
卷: 42, 期: 9 起始页码: 3273
结束页码: 3281
语种: 英语
英文关键词: 2014 Kangding earthquake
; InSAR inversion
; moment budget
; seismicity relocation
Scopus关键词: Budget control
; Fault slips
; Faulting
; Interferometry
; Seismology
; Strain energy
; Synthetic aperture radar
; Accumulated strain
; Earthquake sequences
; InSAR inversion
; Interferometric synthetic aperture radars
; Inversion results
; Joint analysis
; Southwest China
; Xianshuihe fault
; Earthquakes
; earthquake event
; earthquake intensity
; fault slip
; geodesy
; seismic moment
; seismicity
; synthetic aperture radar
; China
; Kangding
; Sichuan
英文摘要: Over 1000 earthquakes struck the northwest of Kangding on the Xianshuihe fault in southwest China between 22 and 29 November 2014, including two largest events of Mw 5.9 and Mw 5.6. The hypocenters of 799 relocated earthquakes suggest that two independent main shock-aftershock subsequences occurred on the Selaha and Zheduotang branches of the Xianshuihe fault, respectively. Fault slip inversion results from one interferometric synthetic aperture radar (InSAR) interferogram (26 September 2014 to 5 December 2014) show that the Mw 5.9 main shock produced a maximum slip of ∼0.47m at the depth of ∼9km. However, there is no distinct slip associated with the Mw 5.6 main shock. The InSAR determined moment is 2.36×1018Nm with a rigidity of 30GPa, equivalent to Mw 6.2, which is about twofold the total seismic moment of all the recorded earthquakes during the InSAR time span. This large discrepancy between geodetic and seismic moment estimates indicates that there was probably rapid aseismic afterslip in the 2 weeks following the Mw 5.9 main shock. The released seismic energy of this earthquake sequence is far less than the accumulated strain energy since the 1955 M 712 earthquake on the same fault branch, which implies that the seismic risk on the Selaha-Kangding segment of the Xianshuihe fault remains high. Key Points The 2014 Kangding earthquake sequence is double-shock type The Mw 5.9 main shock produces distinct coseismic slip The risk of large earthquake near Kangding is still high ©2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84930480846&doi=10.1002%2f2015GL063750&partnerID=40&md5=55c941146f1c18337814be94d997fd72
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/9006
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: Key Laboratory of Active Tectonics and Volcano, Institute of Geology, China Earthquake Administration, Beijing, China
Recommended Citation:
Jiang G.,Wen Y.,Liu Y.,et al. Joint analysis of the 2014 Kangding, southwest China, earthquake sequence with seismicity relocation and InSAR inversion[J]. Geophysical Research Letters,2015-01-01,42(9).