DOI: 10.1002/2015GL067369
论文题名: Slip segmentation and slow rupture to the trench during the 2015, Mw8.3 Illapel, Chile earthquake
作者: Melgar D. ; Fan W. ; Riquelme S. ; Geng J. ; Liang C. ; Fuentes M. ; Vargas G. ; Allen R.M. ; Shearer P.M. ; Fielding E.J.
刊名: Geophysical Research Letters
ISSN: 0094-9387
EISSN: 1944-9118
出版年: 2016
卷: 43, 期: 3 起始页码: 961
结束页码: 966
语种: 英语
英文关键词: earthquake seismology
; subfuction zone
; tsunami
Scopus关键词: Capillary flow
; Geophysics
; Tsunamis
; Back-projection
; Chile earthquakes
; Field measurement
; Geophysical observations
; Kinematic slip models
; Shallow faults
; Strong ground motion
; Subduction zones
; Earthquakes
; coseismic process
; earthquake event
; fault
; ground motion
; rupture
; segmentation
; seismology
; slip
; subduction zone
; thrust
; tsunami
; Chile
英文摘要: The 2015 Mw8.3 Illapel, Chile earthquake is the latest megathrust event on the central segment of that subduction zone. It generated strong ground motions and a large (up to 11 m runup) tsunami which prompted the evacuation of more than 1 million people in the first hours following the event. Observations during recent earthquakes suggest that these phenomena can be associated with rupture on different parts of the megathrust. The deep portion generates strong shaking while slow, large slip on the shallow fault is responsible for the tsunami. It is unclear whether all megathrusts can have shallow slip during coseismic rupture and what physical properties regulate this. Here we show that the Illapel event ruptured both deep and shallow segments with substantial slip. We resolve a kinematic slip model using regional geophysical observations and analyze it jointly with teleseismic backprojection. We find that the shallow and deep portions of the megathrust are segmented and have fundamentally different behavior. We forward calculate local tsunami propagation from the resolved slip and find good agreement with field measurements, independently validating the slip model. These results show that the central portion of the Chilean subduction zone has accumulated a significant shallow slip deficit and indicates that, given enough time, shallow slip might be possible everywhere along the subduction zone. © 2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84961286727&doi=10.1002%2f2015GL067369&partnerID=40&md5=f481cf6a35c96c34d3db9569290dc703
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/10350
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: Seismological Laboratory, University of California, Berkeley, CA, United States
Recommended Citation:
Melgar D.,Fan W.,Riquelme S.,et al. Slip segmentation and slow rupture to the trench during the 2015, Mw8.3 Illapel, Chile earthquake[J]. Geophysical Research Letters,2016-01-01,43(3).