气候变化领域集成服务门户(CCPortal): Surface-Wave Attenuation From Seismic Ambient Noise: Numerical Validation and Application

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DOI	10.1029/2020JB019865
	Surface-Wave Attenuation From Seismic Ambient Noise: Numerical Validation and Application
	Magrini F.; Boschi L.
发表日期	2021
ISSN	21699313
卷号	126 期号:1
英文摘要	We evaluate, by numerical tests, whether surface-wave attenuation can be determined from ambient-noise data. We generate synthetic recordings of numerically simulated ambient seismic noise in several experimental setups, characterized by different source distributions and different values of attenuation coefficient. We use them to verify that the source spectrum can be reconstructed from ambient recordings (provided that the density of sources and the attenuation coefficient are known) and that true attenuation can be retrieved from normalized cross correlations of synthetic signals. We then apply the so validated method to real continuous recordings from 33 broadband receivers distributed within the Colorado Plateau and Great Basin. A preliminary analysis of the signal-to-noise ratio as a function of azimuth reveals a SW-NE preferential directionality of the noise sources within the secondary microseism band (6–8 s), consistent with previous studies. By nonlinear inversion of noise data we find the attenuation coefficient in the area of interest to range from ∼ 1 × 10−5 m−1 at 0.3 Hz to ∼ 4.5 × 10−7 m−1 at 0.065 Hz, and confirm the statistical robustness of this estimate by means of a bootstrap analysis. The result is compatible with previous observations based on both earthquake-generated and ambient Rayleigh waves. In this regard, the method proves to be promising in accurately quantifying surface-wave attenuation at relatively high frequencies. © 2020. American Geophysical Union. All Rights Reserved.
英文关键词	ambient-noise interferometry; attenuation; surface waves
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/187412
作者单位	Department of Sciences, Università Degli Studi Roma Tre, Roma RM, Italy; Dipartimento di Geoscienze, Università Degli Studi Di Padova, Padova, Italy; Sorbonne Université, CNRS, INSU, Institut des Sciences de La Terre De Paris, Paris, France; Istituto Nazionale Di Geofisica e Vulcanologia, Bologna, Italy
推荐引用方式 GB/T 7714	Magrini F.,Boschi L.. Surface-Wave Attenuation From Seismic Ambient Noise: Numerical Validation and Application[J],2021,126(1).
APA	Magrini F.,&Boschi L..(2021).Surface-Wave Attenuation From Seismic Ambient Noise: Numerical Validation and Application.Journal of Geophysical Research: Solid Earth,126(1).
MLA	Magrini F.,et al."Surface-Wave Attenuation From Seismic Ambient Noise: Numerical Validation and Application".Journal of Geophysical Research: Solid Earth 126.1(2021).