气候变化领域集成服务门户(CCPortal): Ground motion signatures of supershear ruptures in the Burridge-Andrews and free-surface-induced mechanisms

CCPortal

DOI	10.1016/j.tecto.2020.228570
	Ground motion signatures of supershear ruptures in the Burridge-Andrews and free-surface-induced mechanisms
	Xu J.; Chen X.; Liu P.; Zhang Z.
发表日期	2020
ISSN	00401951
卷号	791
英文摘要	We analyze the ground motions of supershear ruptures in the Burridge-Andrews (BAM) and free-surface-induced (FSI) mechanisms. BAM supershear ruptures require higher initial shear stress than FSI supershear ruptures, thus cause faster rupture speed. The supershear slip pulse initiates at the free surface or upper boundary of a fault for FSI and at the hypocenter depth in the in-plane direction for BAM in homogeneous models. Both BAM and FSI supershear ruptures can generate Mach waves and the Rayleigh wave field. The BAM and the faster FSI supershear ruptures can make stronger shear Mach waves. The shear Mach waves show a larger amplitude of negative component for a faster FSI supershear rupture. The FSI supershear ruptures make the strongest dilatational wave next to the fault while it is at a distance away from the fault for the BAM supershear ruptures. The different shapes of supershear rupture front, locations of supershear triggered and the rupture speeds contribute to these contrasts. And we find that the BAM and the faster FSI supershear ruptures can trigger more high-frequency radiation due to the sharper and stronger shear Mach waves. Finally, the comparisons between the simulated seismograms and the records of PS10 indicate that the 2002 Denali earthquake may represent a supershear one with the FSI mechanism and a slow supershear rupture speed. © 2020 Elsevier B.V.
关键词	Free surface Ground motion High frequency Supershear rupture
英文关键词	Shear stress; Different shapes; Dilatational waves; High-frequency radiation; Homogeneous models; In-plane direction; Initial shear stress; Negative components; Supershear rupture; Shear flow; amplitude; earthquake hypocenter; earthquake magnitude; earthquake rupture; ground motion; Rayleigh wave; S-wave; seismogram; Alaska; Denali Fault Zone; United States
语种	英语
来源期刊	Tectonophysics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/207898
作者单位	Academy for Advanced Interdisciplinary Studies, Southern University of Science and Technology (SUSTech), Shenzhen, 518055, China; Department of Earth and Space Sciences, Southern University of Science and Technology (SUSTech), Shenzhen, 518055, China
推荐引用方式 GB/T 7714	Xu J.,Chen X.,Liu P.,et al. Ground motion signatures of supershear ruptures in the Burridge-Andrews and free-surface-induced mechanisms[J],2020,791.
APA	Xu J.,Chen X.,Liu P.,&Zhang Z..(2020).Ground motion signatures of supershear ruptures in the Burridge-Andrews and free-surface-induced mechanisms.Tectonophysics,791.
MLA	Xu J.,et al."Ground motion signatures of supershear ruptures in the Burridge-Andrews and free-surface-induced mechanisms".Tectonophysics 791(2020).