气候变化领域集成服务门户(CCPortal): Using a Time-Based Subarray Method to Extract and Invert Noise-Derived Body Waves at Long Beach, California

CCPortal

DOI	10.1029/2019JB018855
	Using a Time-Based Subarray Method to Extract and Invert Noise-Derived Body Waves at Long Beach, California
	Castellanos J.C.; Clayton R.W.; Juarez A.
发表日期	2020
ISSN	21699313
卷号	125 期号:5
英文摘要	The reconstruction of body waves from the cross-correlation of random wavefields has recently emerged as a promising approach to probe the fine-scale structure of the Earth. However, because of the nature of the ambient noise field, the retrieval of body waves from seismic noise recordings is highly challenging and has only been successful in a few cases. Here, we use seismic noise data from a 5,200-node oil-company survey to reconstruct body waves and determine the velocity structure beneath Long Beach, California. To isolate the body wave energy from the ambient noise field, we divide the entire survey into small-aperture subarrays and apply a modified double-beamforming scheme to enhance coherent arrivals within the cross-correlated waveforms. The resulting beamed traces allow us to identify clear refracted P waves traveling between different subarray pairs, which we then use to construct a high-resolution 3D velocity model of the region. The inverted velocity model reveals velocity variations of the order of 3% and strong lateral discontinuities caused by the presence of sharp geologic structures such as the Newport-Inglewood fault (NIF). Additionally, we show that the resolution that is achieved through the use of high-frequency body waves allows us to illuminate small geometric variations of the NIF that were previously unresolved with traditional passive imaging methods. ©2020. The Authors.
英文关键词	Ambient noise; Body waves; Double-beamforming; Long Beach; Seismic tomography
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/187842
作者单位	Seismological Laboratory, Department of Earth and Planetary Sciences, Caltech, Pasadena, CA, United States; Department of Earth Sciences, University of Southern California, Los Angeles, CA, United States
推荐引用方式 GB/T 7714	Castellanos J.C.,Clayton R.W.,Juarez A.. Using a Time-Based Subarray Method to Extract and Invert Noise-Derived Body Waves at Long Beach, California[J],2020,125(5).
APA	Castellanos J.C.,Clayton R.W.,&Juarez A..(2020).Using a Time-Based Subarray Method to Extract and Invert Noise-Derived Body Waves at Long Beach, California.Journal of Geophysical Research: Solid Earth,125(5).
MLA	Castellanos J.C.,et al."Using a Time-Based Subarray Method to Extract and Invert Noise-Derived Body Waves at Long Beach, California".Journal of Geophysical Research: Solid Earth 125.5(2020).