DOI: 10.1002/2016GL067785
论文题名: Fault interactions and triggering during the 10 January 2012 Mw 7.2 Sumatra earthquake
作者: Fan W. ; Shearer P.M.
刊名: Geophysical Research Letters
ISSN: 0094-9269
EISSN: 1944-9000
出版年: 2016
卷: 43, 期: 5 起始页码: 1934
结束页码: 1942
语种: 英语
英文关键词: back projection
; earthquake triggering
; fault interactions
; seismology
; Sumatra
Scopus关键词: Faulting
; Geophysics
; Seismic waves
; Seismology
; Surface waves
; Back projection
; Earthquake triggering
; Fault interactions
; Frequency dependencies
; Intraplate earthquakes
; Strike-slip earthquakes
; Subduction interface
; Sumatra
; Earthquakes
英文摘要: The 10 January 2012 Mw 7.2 Sumatra earthquake in the Wharton basin occurred 3 months before the great Mw 8.6 and Mw 8.2 earthquakes in the same region, which had complex ruptures and are the largest strike-slip earthquakes ever recorded. Teleseismic P wave back projection of the Mw 7.2 earthquake images a unilateral rupture lasting ∼40 s without observable frequency dependency (low frequency, 0.05-0.3 Hz, high frequency, 0.3-1 Hz). In addition to radiation bursts during the Mw 7.2 main shock, coherent energy releases from 50 to 75 s and from 100 to 125 s are observed about 143 km northeast of the main shock rupture and landward of the trench. Analysis of globally recorded P waves, in both 0.02-0.05 Hz velocity records and 1-5 Hz stacked envelope functions, confirms the presence of coherent sources during the time windows. The observed energy bursts are likely to be large early aftershocks occurring on or near the subduction interface. Both dynamic and static triggering could have induced these early aftershocks, as they initiated after the surface wave passed by, and the Coulomb stress perturbations from the Mw 7.2 main shock promote earthquakes in the observed locations. The earthquake sequence is a clear example of a seaward-intraplate strike-slip earthquake triggering landward-intraplate earthquakes in the same region, in contrast to previously reported normal-reverse or reverse-normal interactions at subduction zones. © 2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84960155178&doi=10.1002%2f2016GL067785&partnerID=40&md5=1a8dd033ca4d04fde120ac243cabd451
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/10232
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: Scripps Institution of Oceanography, University of California, San Diego, San Diego, California, United States
Recommended Citation:
Fan W.,Shearer P.M.. Fault interactions and triggering during the 10 January 2012 Mw 7.2 Sumatra earthquake[J]. Geophysical Research Letters,2016-01-01,43(5).