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DOI	10.1038/s41561-018-0297-z
	Early and persistent supershear rupture of the 2018 magnitude 7.5 Palu earthquake
	Bao H.; Ampuero J.-P.; Meng L.; Fielding E.J.; Liang C.; Milliner C.W.D.; Feng T.; Huang H.
发表日期	2019
ISSN	17520894
卷号	12 期号:3
英文摘要	The speed at which an earthquake rupture propagates affects its energy balance and ground shaking impact. Dynamic models of supershear earthquakes, which are faster than the speed of shear waves, often start at subshear speed and later run faster than Eshelby’s speed. Here we present robust evidence of an early and persistent supershear rupture at the sub-Eshelby speed of the 2018 magnitude 7.5 Palu, Indonesia, earthquake. Slowness-enhanced back-projection of teleseismic data provides a sharp image of the rupture process, along a path consistent with the surface rupture trace inferred by subpixel correlation of synthetic-aperture radar and satellite optical images. The rupture propagated at a sustained velocity of 4.1 km s–1 from its initiation to its end, despite large fault bends. The persistent supershear speed is further validated by seismological evidence of far-field Rayleigh Mach waves. The unusual features of this earthquake probe the connections between the rupture dynamics and fault structure. An early supershear transition could be promoted by fault roughness near the hypocentre. Steady rupture propagation at a speed unexpected in homogeneous media could result from the presence of a low-velocity damaged fault zone. © 2019, The Author(s), under exclusive licence to Springer Nature Limited.
语种	英语
scopus关键词	earthquake magnitude; earthquake rupture; fault zone; image analysis; pixel; satellite imagery; seismic data; synthetic aperture radar; Central Sulawesi; Indonesia; Palu
来源期刊	Nature Geoscience
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/124710
作者单位	Earth, Planetary and Space Sciences, University of California, Los Angeles, CA, United States; Université Côte d’Azur, IRD, CNRS, Observatoire de la Côte d’Azur, Géoazur, France; California Institute of Technology, Seismological Laboratory, Pasadena, CA, United States; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States
推荐引用方式 GB/T 7714	Bao H.,Ampuero J.-P.,Meng L.,et al. Early and persistent supershear rupture of the 2018 magnitude 7.5 Palu earthquake[J],2019,12(3).
APA	Bao H..,Ampuero J.-P..,Meng L..,Fielding E.J..,Liang C..,...&Huang H..(2019).Early and persistent supershear rupture of the 2018 magnitude 7.5 Palu earthquake.Nature Geoscience,12(3).
MLA	Bao H.,et al."Early and persistent supershear rupture of the 2018 magnitude 7.5 Palu earthquake".Nature Geoscience 12.3(2019).