气候变化领域集成服务门户(CCPortal): Inchworm-like source evolution through a geometrically complex fault fueled persistent supershear rupture during the 2018 Palu Indonesia earthquake

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DOI	10.1016/j.epsl.2020.116449
	Inchworm-like source evolution through a geometrically complex fault fueled persistent supershear rupture during the 2018 Palu Indonesia earthquake
	Okuwaki R.; Hirano S.; Yagi Y.; Shimizu K.
发表日期	2020
ISSN	0012821X
卷号	547
英文摘要	How does fault slip follow an earthquake rupture front propagating faster than the local shear-wave velocity (i.e., at supershear speed)? How does a supershear rupture front pass through a geometrically complex fault system? Resolving the evolution of such complex earthquake ruptures is fundamental to our understanding of earthquake-source physics, but these events have not been well captured by conventional waveform inversions of observational data. We applied a new framework of finite-fault inversion to globally observed teleseismic waveforms and resolved both the spatiotemporal evolution of slip and the fault geometry of the 2018 Palu earthquake (moment magnitude 7.6) in Sulawesi, Indonesia. We show that supershear rupture propagation for this event was sustained by transient slip stagnation and advancement as the rupture front passed through the geometrically complex fault system. This peculiar inchworm-like slip evolution was caused by the rupture front encountering fault bends with favorable and unfavorable orientations for rupture propagation. Our analysis also identified the possible existence of a fault junction beneath Palu Bay connecting an unmapped primary fault in northern Sulawesi with the Palu-Koro fault in the south. © 2020 Elsevier B.V.
关键词	2018 Palu earthquake complex fault geometry kinematic source inversion supershear rupture
英文关键词	Earthquakes; Shear flow; Shear waves; Wave propagation; Complex fault system; Earthquake rupture; Finite fault inversions; Rupture propagation; Shear wave velocity; Spatiotemporal evolution; Teleseismic waveforms; Waveform inversion; Fault slips; earthquake event; earthquake rupture; fault slip; geometry; seismic source; spatiotemporal analysis; teleseismic wave; Central Sulawesi; Indonesia; Palu
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/202815
作者单位	Mountain Science Center, University of Tsukuba, Tsukuba, Ibaraki 305-8572, Japan; College of Science and Engineering, Ritsumeikan University, Kusatsu, Shiga 525-8577, Japan; Faculty of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8572, Japan; Graduate School of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8572, Japan
推荐引用方式 GB/T 7714	Okuwaki R.,Hirano S.,Yagi Y.,et al. Inchworm-like source evolution through a geometrically complex fault fueled persistent supershear rupture during the 2018 Palu Indonesia earthquake[J],2020,547.
APA	Okuwaki R.,Hirano S.,Yagi Y.,&Shimizu K..(2020).Inchworm-like source evolution through a geometrically complex fault fueled persistent supershear rupture during the 2018 Palu Indonesia earthquake.Earth and Planetary Science Letters,547.
MLA	Okuwaki R.,et al."Inchworm-like source evolution through a geometrically complex fault fueled persistent supershear rupture during the 2018 Palu Indonesia earthquake".Earth and Planetary Science Letters 547(2020).