DOI: 10.1038/NGEO2990
论文题名: Tsunamigenic structures in a creeping section of the Alaska subduction zone
作者: Bécel A. ; Shillington D.J. ; Delescluse M. ; Nedimović M.R. ; Abers G.A. ; Saffer D.M. ; Webb S.C. ; Keranen K.M. ; Roche P.-H. ; Li J. ; Kuehn H.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2017
卷: 10, 期: 8 起始页码: 609
结束页码: 613
语种: 英语
Scopus关键词: crust
; earthquake event
; earthquake rupture
; hazard assessment
; plate boundary
; seismic reflection
; subduction zone
; Tohoku earthquake 2011
; tsunami
; tsunami event
; Alaska
; United States
英文摘要: Segments of subduction zones that are capable of generating tsunamigenic earthquakes appear to have characteristic structural configurations. These structures include heterogeneous plate interfaces, a small wedge of deformed sediment at the toe of the overriding plate (the frontal prism), and splay faults in the crust of the overriding plate that root within the plate boundary megathrust. Here we use seismic reflection imaging to show that these features also exist within a creeping segment of the Alaska subduction zone, the Shumagin Gap. We identify an active crustal-scale normal fault system that dips landward and resembles that involved in the 2011 Tohoku-oki earthquake in Japan. We also find that the Shumagin Gap has a small frontal prism, a deep-water splay fault, and that the plate interface here is rough and thinly sedimented. We propose that lateral propagation of rupture from a neighbouring segment into the Shumagin Gap may explain a tsunamigenic earthquake that occurred there in 1788 and that tsunamigenic potential should be considered in hazard assessments for the region. Our results demonstrate that structural configurations similar to those in Tohoku may exist in other subduction zones, including within creeping segments or segments with no record of historical megathrust earthquakes, but are underrecognized. Identifying similar configurations globally may improve our ability to anticipate regions capable of generating large tsunamis. © 2017 Macmillan Publishers Limited, part of Springer Nature. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/105739
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY, United States; Ecole Normale Supérieure, UMR 8538, PSL Research University, Paris, France; Dalhousie University, Halifax, NS, Canada; Cornell University, Ithaca, NY, United States; Penn State, University Park, PA, United States
Recommended Citation:
Bécel A.,Shillington D.J.,Delescluse M.,et al. Tsunamigenic structures in a creeping section of the Alaska subduction zone[J]. Nature Geoscience,2017-01-01,10(8)