DOI: 10.1016/j.tecto.2020.228570
论文题名: Ground motion signatures of supershear ruptures in the Burridge-Andrews and free-surface-induced mechanisms
作者: Xu J. ; Chen X. ; Liu P. ; Zhang Z.
刊名: Tectonophysics
ISSN: 00401951
出版年: 2020
卷: 791 语种: 英语
中文关键词: 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
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. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170731
Appears in Collections: 气候变化与战略
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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
Recommended Citation:
Xu J.,Chen X.,Liu P.,et al. Ground motion signatures of supershear ruptures in the Burridge-Andrews and free-surface-induced mechanisms[J]. Tectonophysics,2020-01-01,791