气候变化领域集成服务门户(CCPortal): Coseismic damage runs deep in continental strike-slip faults

CCPortal

DOI	10.1016/j.epsl.2020.116226
	Coseismic damage runs deep in continental strike-slip faults
	Song B.R.; Johnson S.E.; Song W.J.; Gerbi C.C.; Yates M.G.
发表日期	2020
ISSN	0012821X
卷号	539
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.
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
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/202898
作者单位	School of Earth and Climate Sciences, University of Maine, Orono, ME 04469, United States
推荐引用方式 GB/T 7714	Song B.R.,Johnson S.E.,Song W.J.,et al. Coseismic damage runs deep in continental strike-slip faults[J],2020,539.
APA	Song B.R.,Johnson S.E.,Song W.J.,Gerbi C.C.,&Yates M.G..(2020).Coseismic damage runs deep in continental strike-slip faults.Earth and Planetary Science Letters,539.
MLA	Song B.R.,et al."Coseismic damage runs deep in continental strike-slip faults".Earth and Planetary Science Letters 539(2020).