气候变化领域集成服务门户(CCPortal): Graph-Space Optimal Transport Concept for Time-Domain Full-Waveform Inversion of Ocean-Bottom Seismometer Data: Nankai Trough Velocity Structure Reconstructed From a 1D Model

CCPortal

DOI	10.1029/2020JB021504
	Graph-Space Optimal Transport Concept for Time-Domain Full-Waveform Inversion of Ocean-Bottom Seismometer Data: Nankai Trough Velocity Structure Reconstructed From a 1D Model
	Górszczyk A.; Brossier R.; Métivier L.
发表日期	2021
ISSN	21699313
卷号	126 期号:5
英文摘要	Detailed reconstruction of deep structures with full-waveform inversion (FWI) of wide-angle ocean-bottom seismometer (OBS) data remains challenging and unconventional. The complexity of the long-offset waveforms increases the nonlinearity of the inverse problem, while the sparsity of the OBS deployments leads to a poorly constrained model reconstruction. Consequently, for such a FWI setting it is difficult to derive an initial model that satisfies the cycle-skipping criterion. Searching for a remedy to this issue, we investigate the graph-space optimal transport (GSOT) technique, which can potentially overcome the cycle-skipping problem at the initial FWI stage. The key feature of the GSOT cost function is the convexity with respect to the patterns in the two seismograms, which allows for correct matching of the arrivals shifted in time for more than half of the wavelet. This in turn shall allow FWI to handle the large kinematic errors of the starting model. We test this hypothesis by applying the time-domain acoustic FWI to the synthetic and field data from the subduction zone environment. We show that despite the complexity of the geological structure, the GSOT misfit function is able to guide the FWI toward the precise velocity model reconstruction and data fitting starting from a simple 1D model. The improved convexity of the GSOT misfit function allows FWI to converge even when mismatches between the observed and synthetic signals reach a few cycles. This ability reduces the constraint on the kinematic accuracy of the initial model and makes the FWI from the OBS data more feasible. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	alternative misfit function; cycle-skipping mitigation; high-resolution crustal-scale imaging; Nankai Trough; time-domain FWI
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/187103
作者单位	ISTerre, Université Grenoble Alpes, Grenoble, France; Institute of Geophysics, Polish Academy of Sciences, Warsaw, Poland; Université Grenoble Alpes, CNRS, LJK, Grenoble, France
推荐引用方式 GB/T 7714	Górszczyk A.,Brossier R.,Métivier L.. Graph-Space Optimal Transport Concept for Time-Domain Full-Waveform Inversion of Ocean-Bottom Seismometer Data: Nankai Trough Velocity Structure Reconstructed From a 1D Model[J],2021,126(5).
APA	Górszczyk A.,Brossier R.,&Métivier L..(2021).Graph-Space Optimal Transport Concept for Time-Domain Full-Waveform Inversion of Ocean-Bottom Seismometer Data: Nankai Trough Velocity Structure Reconstructed From a 1D Model.Journal of Geophysical Research: Solid Earth,126(5).
MLA	Górszczyk A.,et al."Graph-Space Optimal Transport Concept for Time-Domain Full-Waveform Inversion of Ocean-Bottom Seismometer Data: Nankai Trough Velocity Structure Reconstructed From a 1D Model".Journal of Geophysical Research: Solid Earth 126.5(2021).