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DOI	10.1016/j.epsl.2020.116197
	Tsunami earthquakes: Vertical pop-up expulsion at the forefront of subduction megathrust
	Hananto N.D.; Leclerc F.; Li L.; Etchebes M.; Carton H.; Tapponnier P.; Qin Y.; Avianto P.; Singh S.C.; Wei S.
发表日期	2020
ISSN	0012821X
卷号	538
英文摘要	Published slip distribution models, based on geodetic, seismological and tsunami data, of the Mw 7.8, 2010 Mentawai tsunami earthquake offshore south-central Sumatra, suggest that the large tsunami wave was generated by a narrow swath of high seafloor uplift along the accretionary wedge front, implying higher vertical throw than that consistent with slip on the shallow-dipping megathrust. Here we present high-resolution seismic reflection profiles across the 2010 rupture zone that image the youngest deformation at the accretionary wedge front. The profiles reveal conjugate, steeply-dipping, active thrust faults that branch upwards from the megathrust and bound triangular pop-ups. The seismologically determined co-seismic slip (≥10 m) on the 6°-dipping decollement probably caused a comparable amount of upward expulsion of these ∼3 km–wide, flat-topped pop-ups. Co-seismic throw on the ≈60° dipping thrusts that bound the pop-up plateaus maximize the uplift of the seafloor and overlying water-column, providing an additional localised tsunami source. Tsunami simulations show that such combined deformation, i.e. the broad-scale seafloor displacement caused by slip on the megathrust and the localized 8–10 m seafloor uplift across a 6–9 km-wide pop-up belt involving up to three pop-ups, is able to reproduce the 2010 tsunami amplitude measured by a DART buoy, and observed run-up heights in the Mentawai Islands. This simple mechanism, observed in analogue sandbox shortening experiments, may thus efficiently generate the oversize waves that characterize Tsunami-Earthquakes. Systematic mapping of pop-ups along accretionary wedge fronts may help identify trench segments prone to produce the special class of seismic events that spawn exceptionally large tsunamis. © 2020 The Authors
关键词	accretionary wedge Mentawai 2010 earthquake pop-up structure seafloor uplift source Tsunami Earthquakes
英文关键词	Deformation; Earthquakes; Faulting; Offshore oil well production; Accretionary wedge; High resolution seismic; Overlying water; Pop-up structures; Sea floor; Slip distribution; Systematic mapping; Tsunami simulation; Tsunamis; accretionary prism; earthquake event; earthquake magnitude; earthquake rupture; seafloor; subduction; thrust fault; tsunami event; uplift; Indonesia; Mentawai Islands; Sumatra; West Sumatra
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202627
作者单位	Research Center for Deep Sea, Indonesian Institute of Sciences, Jl. Syaranamual Ambon97233, Indonesia; Géoazur, Université Côte d'Azur (U. Nice, CNRS, Observatoire de la Côte d'Azur, IRD), 250 rue Albert Einstein, Sophia Antipolis, CS 10269-F 06905, France; Guangdong Provincial Key Laboratory of Geodynamics and Geohazards, School of Earth Sciences and Engineering, Sun Yat-Sen University, Guangzhou, 510275, China; Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai, 519082, China; Schlumberger Doll Research, One Hampshire Street, Cambridge, MA 02139, United States; Equipe de Géosciences Marines, Institut de Physique du Globe de Paris (CNRS, Paris Diderot, Sorbonne Paris Cité), 1 rue Jussieu, Paris Cedex 05, 75238, France; Institute of Crustal Dynamics (ICD), China Earthquake Administration (CEA), Beijing, No. 1, Anningzhuang Rd., Haidian District100085, China; Earth Observatory of Singapore, Asian School of the Environment, Nanyang Technological University, N2-01A-08, 50 Nanyang ...
推荐引用方式 GB/T 7714	Hananto N.D.,Leclerc F.,Li L.,et al. Tsunami earthquakes: Vertical pop-up expulsion at the forefront of subduction megathrust[J],2020,538.
APA	Hananto N.D..,Leclerc F..,Li L..,Etchebes M..,Carton H..,...&Wei S..(2020).Tsunami earthquakes: Vertical pop-up expulsion at the forefront of subduction megathrust.Earth and Planetary Science Letters,538.
MLA	Hananto N.D.,et al."Tsunami earthquakes: Vertical pop-up expulsion at the forefront of subduction megathrust".Earth and Planetary Science Letters 538(2020).