DOI: 10.1785/0120190162
论文题名: Evidence of fault immaturity from shallow slip deficit and lack of postseismic deformation of the 2017 Mw 6.5 Jiuzhaigou earthquake
作者: Li Y. ; Bürgmann R. ; Zhao B.
刊名: Bulletin of the Seismological Society of America
ISSN: 371106
出版年: 2020
卷: 110, 期: 1 语种: 英语
Scopus关键词: Deformation
; Earthquakes
; Strike-slip faults
; Synthetic aperture radar
; Time series analysis
; 2008 wenchuan earthquakes
; Interferometric synthetic aperture radars
; Postseismic deformation
; Static Coulomb stress changes
; Strike-slip earthquakes
; Surface deformation
; Viscoelastic stress
; Wenchuan Earthquake
; Fault slips
; deformation
; earthquake event
; fault geometry
; GPS
; postseismic process
; rupture
; satellite data
; Sentinel
; synthetic aperture radar
; China
; Sichuan
英文摘要: The Mw 6.5 Jiuzhaigou earthquake occurred on 8 August 2017 36 km west-southwest of Yongle, Sichuan, China. We use both ascending and descending Interferometric Synthetic Aperture Radar (InSAR) data from Sentinel-1 and coseismic offsets of four Global Positioning System sites to obtain the coseismic surface deformation field and invert for the fault geometry and slip distribution. Most slip of the left-lateral strike-slip earthquake occurred in the 3–10 km depth interval with a maximum slip of about 1 m and a large shallow slip deficit (SSD). An eight-month InSAR time-series analysis documents a lack of resolvable postseismic deformation, and inversions for the distribution of postseismic slip demonstrate the lack of shallow afterslip. We argue that the observations of a pronounced SSD and no early afterslip of the Jiuzhaigou earthquake are indicative of an immature fault and that all incipient young strike-slip faults likely feature a SSD. We would expect a complex rupture geometry with distributed coseismic failure in the uppermost part of the brittle crust during the fault-zone development. As faults mature, they straighten out, develop a localized fault-zone core, and the SSD diminishes. By calculating the static Coulomb stress change and nine-year viscoelastic stress change caused by the Wenchuan earthquake, we also show that the 2008 Wenchuan earthquake did not significantly affect the time of occurrence of the 2017 Jiuzhaigou earthquake. © Seismological Society of America. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/159751
Appears in Collections: 气候变化与战略
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作者单位: Berkeley Seismological Laboratory, Department of Earth and Planetary Science, University of California, Berkeley, CA, United States; Key Laboratory of Earthquake Geodesy, Institute of Seismology, China Earthquake Administration, Wuhan, China
Recommended Citation:
Li Y.,Bürgmann R.,Zhao B.. Evidence of fault immaturity from shallow slip deficit and lack of postseismic deformation of the 2017 Mw 6.5 Jiuzhaigou earthquake[J]. Bulletin of the Seismological Society of America,2020-01-01,110(1)