DOI: 10.1016/j.quascirev.2015.06.003
Scopus记录号: 2-s2.0-84931282176
论文题名: Time-varying interseismic strain rates and similar seismic ruptures on the Nias-Simeulue patch of the Sunda megathrust
作者: Meltzner A.J. ; Sieh K. ; Chiang H.-W. ; Wu C.-C. ; Tsang L.L.H. ; Shen C.-C. ; Hill E.M. ; Suwargadi B.W. ; Natawidjaja D.H. ; Philibosian B. ; Briggs R.W.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2015
卷: 122 起始页码: 258
结束页码: 281
语种: 英语
英文关键词: Coral microatolls
; Earthquake recurrence
; Interseismic deformation
; Paleogeodesy
; Paleoseismology
; Slow slip events
; Subduction zone
; Sumatra
Scopus关键词: Deformation
; Locks (fasteners)
; Reefs
; Seismology
; Strain rate
; Subsidence
; Coral microatolls
; Earthquake recurrence
; Interseismic deformations
; Paleogeodesy
; Paleoseismology
; Slow slip events
; Subduction zones
; Sumatra
; Earthquakes
; coral reef
; coseismic process
; deformation
; earthquake recurrence
; earthquake rupture
; geodesy
; paleoseismicity
; slip rate
; strain rate
; strike (geology)
; subsidence
; uplift
; Aceh
; Greater Sunda Islands
; Indonesian seas
; Nias
; North Sumatra
; Pacific Ocean
; Simeulue
; Sumatra
; Sunda Arc
; Sunda Isles
; Anthozoa
英文摘要: Fossil coral microatolls from fringing reefs above the great (MW 8.6) megathrust rupture of 2005 record uplift during the historically reported great earthquake of 1861. Such evidence spans nearly the entire 400-km strike length of the 2005 rupture, which was previously shown to be bounded by two persistent barriers to seismic rupture. Moreover, at sites where we have constrained the 1861 uplift amplitude, it is comparable to uplift in 2005. Thus the 1861 and 2005 ruptures appear to be similar in both extent and magnitude. At one site an uplift around AD 1422 also appears to mimic the amount of uplift in 2005. The high degree of similarity among certain ruptures of this Nias-Simeulue section of the Sunda megathrust contrasts with the substantial disparities amongst ruptures along other sections of the Sumatran portion of the Sunda megathrust. At a site on the northwestern tip of Nias, reefs also rose during an earthquake in AD 1843, known historically for its damaging tsunami along the eastern coast of the island.The coral microatolls also record interseismic vertical deformation, at annual to decadal resolution, spanning decades to more than a century before each earthquake. The corals demonstrate significant changes over time in the rates of interseismic deformation. On southern Simeulue, interseismic subsidence rates were low between 1740 and 1820 but abruptly increased by a factor of 4-10, two to four decades before the 1861 rupture. This may indicate that full coupling or deep locking of the megathrust began only a few decades before the great earthquake. In the Banyak Islands, near the pivot line separating coseismic uplift from subsidence in 2005, ongoing interseismic subsidence switched to steady uplift from 1966 until 1981, suggesting a 15-year-long slow slip event, with slip velocities at more than 120% of the plate convergence rate. © 2015 The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59879
Appears in Collections: 过去全球变化的重建
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作者单位: Earth Observatory of Singapore, Nanyang Technological University, Singapore; Tectonics Observatory, California Institute of Technology, Pasadena, CA, United States; High-precision Mass Spectrometry and Environment Change Laboratory (HISPEC), Department of Geosciences, National Taiwan University, Taipei, Taiwan; Research Center for Geotechnology, Indonesian Institute of Sciences (LIPI), Bandung, Indonesia; Équipe de Tectonique et Mécanique de la Lithosphère, Institut de Physique du Globe de Paris, Paris, France; Geologic Hazards Science Center, U.S. Geological Survey, Denver, CO, United States
Recommended Citation:
Meltzner A.J.,Sieh K.,Chiang H.-W.,et al. Time-varying interseismic strain rates and similar seismic ruptures on the Nias-Simeulue patch of the Sunda megathrust[J]. Quaternary Science Reviews,2015-01-01,122