气候变化领域集成服务门户(CCPortal): Does a Damaged-Fault Zone Mitigate the Near-Field Impact of Supershear Earthquakes?—Application to the 2018 Mw 7.5 Palu; Indonesia; Earthquake

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DOI	10.1029/2019GL085649
	Does a Damaged-Fault Zone Mitigate the Near-Field Impact of Supershear Earthquakes?—Application to the 2018 Mw 7.5 Palu; Indonesia; Earthquake
	Oral E.; Weng H.; Ampuero J.P.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:1
英文摘要	The impact of earthquakes can be severely aggravated by cascading secondary hazards. The 2018 MW 7.5 Palu, Indonesia, earthquake led to devastating tsunamis and landslides, while triggered submarine landslides possibly contributed substantially to generate the tsunami. The rupture was supershear over most of its length, but its speed was unexpectedly slow for a supershear event, between the S wave velocity VS and Eshelby's speed √2VS, an unstable speed range in conventional theory. Here, we investigate whether dynamic rupture models including a low-velocity fault zone can reproduce such a steady supershear rupture with a relatively low speed. We then examine numerically how this peculiar feature of the Palu earthquake could have affected the near-field ground motion and thus the secondary hazards. Our findings suggest that the presence of a low-velocity fault zone can explain the unexpected rupture speed and may have mitigated the near-field ground motion and the induced landslides in Palu. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Faulting; Hazards; Landslides; Seismic waves; Shear waves; Speed; Submarine geology; Tsunamis; Wave propagation; Conventional theory; Dynamic rupture models; Earthquake-induced landslides; Fault zone; Near field ground motion; Submarine landslides; Supershear earthquakes; Supershear rupture; Earthquakes; earthquake event; earthquake rupture; fault zone; ground motion; landslide; low velocity zone; seismic wave; shear stress; submarine landslide; wave propagation; Central Sulawesi; Indonesia; Palu
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/170879
作者单位	Université Côte d'Azur, IRD, CNRS, Observatoire de la Côte d'Azur, Géoazur, France; Seismological Laboratory, California Institute of Technology, Pasadena, CA, United States
推荐引用方式 GB/T 7714	Oral E.,Weng H.,Ampuero J.P.. Does a Damaged-Fault Zone Mitigate the Near-Field Impact of Supershear Earthquakes?—Application to the 2018 Mw 7.5 Palu; Indonesia; Earthquake[J],2020,47(1).
APA	Oral E.,Weng H.,&Ampuero J.P..(2020).Does a Damaged-Fault Zone Mitigate the Near-Field Impact of Supershear Earthquakes?—Application to the 2018 Mw 7.5 Palu; Indonesia; Earthquake.Geophysical Research Letters,47(1).
MLA	Oral E.,et al."Does a Damaged-Fault Zone Mitigate the Near-Field Impact of Supershear Earthquakes?—Application to the 2018 Mw 7.5 Palu; Indonesia; Earthquake".Geophysical Research Letters 47.1(2020).