DOI: 10.1038/s41561-021-00727-y
论文题名: Long-lived shallow slow-slip events on the Sunda megathrust
作者: Mallick R. ; Meltzner A.J. ; Tsang L.L.H. ; Lindsey E.O. ; Feng L. ; Hill E.M.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2021
卷: 14, 期: 5 起始页码: 327
结束页码: 333
语种: 英语
英文关键词: displacement
; earthquake event
; fault slip
; numerical model
; slip
; tectonic plate
; tsunami
; Aceh
; Greater Sunda Islands
; Indonesia
; Simeulue
; Sumatra
; Sunda Isles
英文摘要: During most of the time between large earthquakes at tectonic plate boundaries, surface displacement time series are generally observed to be linear. This linear trend is interpreted as a result of steady stress accumulation at frictionally locked asperities on the fault interface. However, due to the short geodetic record, it is still unknown whether all interseismic periods show similar rates, and whether frictionally locked asperities remain stationary. Here we show that two consecutive interseismic periods at Simeulue Island, Indonesia experienced significantly different displacement rates, which cannot be explained by a sudden reorganization of locked and unlocked regions. Rather, these observations necessitate the occurrence of a 32-year slow-slip event on a shallow, frictionally stable area of the megathrust. We develop a self-consistent numerical model of such events driven by pore-fluid migration during the earthquake cycle. The resulting slow-slip events appear as abrupt velocity changes in geodetic time series. Due to their long-lived nature, we may be missing or mis-modelling these transient phenomena in a number of settings globally; we highlight one such ongoing example at Enggano Island, Indonesia. We provide a method for detecting these slow-slip events that will enable a substantial revision to the earthquake and tsunami hazard and risk for populations living close to these faults. © 2021, The Author(s), under exclusive licence to Springer Nature Limited. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/169789
Appears in Collections: 气候变化与战略
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作者单位: Asian School of the Environment, Nanyang Technological University, Singapore, Singapore; Earth Observatory of Singapore, Nanyang Technological University, Singapore, Singapore; Université Côte d’Azur, CNRS, Observatoire de la Côte d’Azur, IRD, Géoazur, Campus CNRS, Sophia Antipolis, Valbonne, France; International Study Centre, University of Surrey, Guildford, United Kingdom; Department of Earth and Planetary Sciences, University of New Mexico, Albuquerque, NM, United States
Recommended Citation:
Mallick R.,Meltzner A.J.,Tsang L.L.H.,et al. Long-lived shallow slow-slip events on the Sunda megathrust[J]. Nature Geoscience,2021-01-01,14(5)