气候变化领域集成服务门户(CCPortal): The Effects of 180 years of Aging on the Physical and Seismic Properties of Partially Saturated Sands

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DOI	10.1029/2020JB021341
	The Effects of 180 years of Aging on the Physical and Seismic Properties of Partially Saturated Sands
	Wright V.; Hornbach M.
发表日期	2021
ISSN	21699313
卷号	126 期号:6
英文摘要	Constraining how the physical properties and seismic responses of recently deposited sands change with time is important for understanding earthquake site response, subsurface fluid flow, and early stages of lithification. Currently, however, there is no detailed (cm-scale) assessment of how sand's physical properties and associated seismic velocities evolve over the first two centuries after deposition. Here, we integrate sedimentation rates with seismic velocity and sediment physical properties data to assess how the vadose zone sands at Port Royal Beach, Jamaica, change within 180 years after deposition. We show that compressional and shear wave velocities increase with sediment age, whereas porosity, grain size, sorting, mineralogy, and cementation fraction remain relatively unchanged during the same period. Rock physics models (constrained by the measured physical properties) predict constant seismic velocities at all sites regardless of sediment age, though misfits between modeled and observed velocities increase with sediment age. We explain these misfits by proposing that shallow sands undergo microstructural grain reorganization that leads to a more uniform distribution of grain contact forces with time. Our results imply that beach sands undergo a previously undocumented lithification process that occurs before compaction. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	compaction; contact creep; geotechnical; rock physics; sand aging
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187063
作者单位	Roy Huffington Department of Earth Sciences, Southern Methodist University, Dallas, TX, United States; Department of Geology and Geophysics, Woods Hole Oceanographic Institution, Woods Hole, MA, United States
推荐引用方式 GB/T 7714	Wright V.,Hornbach M.. The Effects of 180 years of Aging on the Physical and Seismic Properties of Partially Saturated Sands[J],2021,126(6).
APA	Wright V.,&Hornbach M..(2021).The Effects of 180 years of Aging on the Physical and Seismic Properties of Partially Saturated Sands.Journal of Geophysical Research: Solid Earth,126(6).
MLA	Wright V.,et al."The Effects of 180 years of Aging on the Physical and Seismic Properties of Partially Saturated Sands".Journal of Geophysical Research: Solid Earth 126.6(2021).