气候变化领域集成服务门户(CCPortal): Marine Sediment Characterized by Ocean-Bottom Fiber-Optic Seismology

CCPortal

DOI	10.1029/2020GL088360
	Marine Sediment Characterized by Ocean-Bottom Fiber-Optic Seismology
	Spica Z.J.; Nishida K.; Akuhara T.; Pétrélis F.; Shinohara M.; Yamada T.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:16
英文摘要	The Sanriku ocean-bottom seismometer system uses an optical fiber cable to guarantee real-time observations at the seafloor. A dark fiber connected to a Distributed Acoustic Sensing (DAS) interrogator converted the cable in an array of 19,000 seismic sensors. We use these measurements to constrain the velocity structure under a section of the cable. Our analysis relies on 24 hr of ambient seismic field recordings. We obtain a high-resolution 2-D shear-wave velocity profile by inverting multimode dispersion curves extracted from frequency-wave number analysis. We also produce a reflection image from autocorrelations of ambient seismic field, highlighting strong impedance contrasts at the interface between the sedimentary layers and the basement. In addition, earthquake wavefield analysis and modeling help to further constrain the sediment properties under the cable. Our results show for the first time that ocean-bottom DAS can produce detailed images of the subsurface, opening new opportunities for cost-effective ocean-bottom imaging in the future. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Acoustic impedance; Cables; Cost effectiveness; Oceanography; Optical fibers; Shear flow; Shear waves; Submarine geology; Wave propagation; Analysis and modeling; Impedance contrast; Multimode dispersion; Ocean bottom seismometer; Real time observation; Sediment properties; Shear wave velocity; Wavenumber analysis; Seismology; acoustic method; autocorrelation; dispersion; marine sediment; real time; S-wave; seafloor; seismology; wave field; waveform analysis; Honshu; Iwate; Japan; Sanriku; Tohoku
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/169933
作者单位	Department of Earth and Environmental Sciences, University of Michigan, Ann Arbor, MI, United States; Formerly at Earthquake Research Institute, The University of Tokyo, Tokyo, Japan; Earthquake Research Institute, The University of Tokyo, Tokyo, Japan; Laboratoire de Physique de l'École Normale Supérieure, ENS, Université PSL, CNRS, Sorbonne Université, Université Paris-Diderot, Sorbonne Paris Cité, Paris, France; Japan Meteorological Agency, Tokyo, Japan
推荐引用方式 GB/T 7714	Spica Z.J.,Nishida K.,Akuhara T.,et al. Marine Sediment Characterized by Ocean-Bottom Fiber-Optic Seismology[J],2020,47(16).
APA	Spica Z.J.,Nishida K.,Akuhara T.,Pétrélis F.,Shinohara M.,&Yamada T..(2020).Marine Sediment Characterized by Ocean-Bottom Fiber-Optic Seismology.Geophysical Research Letters,47(16).
MLA	Spica Z.J.,et al."Marine Sediment Characterized by Ocean-Bottom Fiber-Optic Seismology".Geophysical Research Letters 47.16(2020).