DOI: 10.1016/j.epsl.2020.116226
论文题名: Coseismic damage runs deep in continental strike-slip faults
作者: Song B.R. ; Johnson S.E. ; Song W.J. ; Gerbi C.C. ; Yates M.G.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 539 语种: 英语
中文关键词: asymmetric damage
; dynamic fragmentation
; fault zone damage
; frictional-to-viscous transition
; garnet
; power-law distribution
英文关键词: Friction
; Garnets
; Light transmission
; Particle size
; Particle size analysis
; Size distribution
; Strike-slip faults
; Structural geology
; asymmetric damage
; Dynamic fragmentation
; Fault zone
; frictional-to-viscous transition
; Power law distribution
; Fault slips
; coseismic process
; earthquake mechanism
; earthquake rupture
; fault zone
; fracture zone
; friction
; garnet
; particle size
; power law distribution
; seismic zone
; shear zone
; size distribution
; strike-slip fault
英文摘要: Coseismic off-fault damage and pulverization significantly influence the mechanical and transport properties, and in turn the rupture dynamics of faults. Although field-based, laboratory, and numerical studies help elucidate the structure of damage zones adjacent to modern strike-slip faults, the vertical extent of these zones remains an open question. To address this question, we analyzed particle size distribution and microfracture density of fragmented garnets from the Sandhill Corner shear zone, a strand of an ancient, seismogenic, strike-slip fault system exhumed from frictional-to-viscous transition depths (400–500 °C). The shear zone has mutually overprinting pseudotachylyte and mylonite, and juxtaposes quartzofeldspathic and schist units. The inner parts of the quartzofeldspathic and schist units (∼63 m and ∼5 m wide from the lithologic contact, respectively) have two-dimensional D-values ≥1.5, which indicates dynamic fragmentation during rupture propagation. Similar to the particle size distribution analysis, microfracture density data from the garnets show progressive but asymmetric increase toward the core in each unit. Our results suggest that coseismic damage extends down to the base of the seismogenic zone in mature strike-slip faults, and the asymmetric distribution of damage may indicate preferred rupture directivity as proposed for some modern strike-slip faults. © 2020 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165276
Appears in Collections: 气候变化与战略
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作者单位: School of Earth and Climate Sciences, University of Maine, Orono, ME 04469, United States
Recommended Citation:
Song B.R.,Johnson S.E.,Song W.J.,et al. Coseismic damage runs deep in continental strike-slip faults[J]. Earth and Planetary Science Letters,2020-01-01,539