气候变化领域集成服务门户(CCPortal): Ambient Noise Surface Wave Reverse Time Migration for Fault Imaging

CCPortal

DOI	10.1029/2020JB020381
	Ambient Noise Surface Wave Reverse Time Migration for Fault Imaging
	Li H.; Li J.; Gu N.; Gao J.; Zhang H.
发表日期	2020
ISSN	21699313
卷号	125 期号:12
英文摘要	Ambient noise tomography (ANT) has become a routine method to image shear-wave velocity variations at different scales. However, ANT can only resolve smooth velocity variations and cannot give high-resolution images of the subsurface discontinuities. Here we propose a novel Transmitted Surface Wave Reverse Time Migration (TSW-RTM) method to directly image fault planes using the empirical surface wave Green's functions retrieved from ambient noise. Our proposed method can directly utilize the reconstructed surface wave waveforms from seismic noise cross-correlations to image the sharp fault discontinuities with the seismic imaging principle. Compared to the conventional ambient noise tomograms, the migrated images from our proposed method delineate fault planes with much higher resolution and certainty for interpretations. The synthetic tests with different fault zone models demonstrate the effectiveness and accuracy of our novel fault imaging method. The proposed TSW-RTM method is also applied to image two different segments of the Tanlu fault zone (TFZ) in eastern China, using the surface waves retrieved from the ambient noise data recorded by dense seismic linear arrays deployed across the TFZ. Our ambient noise imaging results are consistent with previous studies in the same areas regarding the fault plane positions and dips. Both synthetic tests and real data applications demonstrate that our method is very useful for fault characterizations in areas where active and passive seismic data are not available. Our proposed TSW-RTM method opens up new ways to utilize the seismic ambient noise for imaging subsurface fault zone structures. © 2020. American Geophysical Union. All Rights Reserved.
英文关键词	Ambient noise; fault plane imaging; reverse time migration; Tanlu fault zone; transmitted surface wave
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/187482
作者单位	Laboratory of Seismology and Physics of Earth's Interior, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, Anhui, China; Mengcheng National Geophysical Observatory, University of Science and Technology of China, Hefei, Anhui, China; CAS Center for Excellence in Comparative Planetology, Hefei, Anhui, China
推荐引用方式 GB/T 7714	Li H.,Li J.,Gu N.,et al. Ambient Noise Surface Wave Reverse Time Migration for Fault Imaging[J],2020,125(12).
APA	Li H.,Li J.,Gu N.,Gao J.,&Zhang H..(2020).Ambient Noise Surface Wave Reverse Time Migration for Fault Imaging.Journal of Geophysical Research: Solid Earth,125(12).
MLA	Li H.,et al."Ambient Noise Surface Wave Reverse Time Migration for Fault Imaging".Journal of Geophysical Research: Solid Earth 125.12(2020).