气候变化领域集成服务门户(CCPortal): Imaging Strong Lateral Heterogeneities Across the Contiguous US Using Body-To-Surface Wave Scattering

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DOI	10.1029/2020JB020798
	Imaging Strong Lateral Heterogeneities Across the Contiguous US Using Body-To-Surface Wave Scattering
	Yu C.; Castellanos J.C.; Zhan Z.
发表日期	2021
ISSN	21699313
卷号	126 期号:1
英文摘要	Body-to-surface wave scattering, originated from strong lateral heterogeneity, has been observed and modeled for decades. Compared to body waves, scattered surface waves propagate along the Earth's surface with less energy loss and, thus, can be observed over a wider distance range. In this study, we utilize surface waves converted from teleseismic SH or Sdiff wave incidence to map strong lateral heterogeneities across the entire contiguous United States. We apply array-based phase coherence analysis to broadband waveforms recorded by the USArray Transportable Array and other permanent/temporary networks to detect coherent signals that are associated with body-to-surface wave scattering. We then locate the source of the scattering by back-propagating the beamformed energy using both straight-ray and curved-ray approximations. Our results show that the distribution of scatterers correlates well with known geological features across the contiguous United States. Topographic/bathymetric relief along the continental slope off the Pacific Border is the major source of scattering in the western United States. On the other hand, sedimentary basins, especially their margins, are the dominant scatterers in the central United States. Moho offsets, such as the one around the periphery of the Colorado Plateau, are also a strong contributor to scattering, but isolating their effect from that of other near-surface structures without any additional constraints can be complicated. Finally, we demonstrate the possibility of using scattered surface waves to constrain subsurface velocity structures, as complementary to conventional earthquake- or ambient noise-based surface wave tomography. © 2020. American Geophysical Union. All Rights Reserved.
英文关键词	back projection; body-to-surface wave conversion; lateral heterogeneities; Moho offset; seismic scattering
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/187395
作者单位	Department of Earth and Space Sciences, Southern University of Science and Technology, Shenzhen, Guangdong, China; Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou, China; Seismological Laboratory, California Institute of Technology, Pasadena, CA, United States
推荐引用方式 GB/T 7714	Yu C.,Castellanos J.C.,Zhan Z.. Imaging Strong Lateral Heterogeneities Across the Contiguous US Using Body-To-Surface Wave Scattering[J],2021,126(1).
APA	Yu C.,Castellanos J.C.,&Zhan Z..(2021).Imaging Strong Lateral Heterogeneities Across the Contiguous US Using Body-To-Surface Wave Scattering.Journal of Geophysical Research: Solid Earth,126(1).
MLA	Yu C.,et al."Imaging Strong Lateral Heterogeneities Across the Contiguous US Using Body-To-Surface Wave Scattering".Journal of Geophysical Research: Solid Earth 126.1(2021).