气候变化领域集成服务门户(CCPortal): On the Detection Capabilities of Underwater Distributed Acoustic Sensing

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DOI	10.1029/2020JB020925
	On the Detection Capabilities of Underwater Distributed Acoustic Sensing
	Lior I.; Sladen A.; Rivet D.; Ampuero J.-P.; Hello Y.; Becerril C.; Martins H.F.; Lamare P.; Jestin C.; Tsagkli S.; Markou C.
发表日期	2021
ISSN	21699313
卷号	126 期号:3
英文摘要	The novel technique of distributed acoustic sensing (DAS) holds great potential for underwater seismology by transforming standard telecommunication cables, such as those currently traversing various regions of the world’s oceans, into dense arrays of seismo-acoustic sensors. To harness these measurements for seismic monitoring, the ability to record transient ground deformations is investigated by analyzing ambient noise, earthquakes, and their associated phase velocities, on DAS records from three dark fibers in the Mediterranean Sea. Recording quality varies dramatically along the fibers and is strongly correlated with the bathymetry and the apparent phase velocities of recorded waves. Apparent velocities are determined for several well-recorded earthquakes and used to convert DAS S-wave strain spectra to ground motion spectra. Excellent agreement is found between the spectra of nearby underwater and on-land seismometers and DAS converted spectra, when the latter are corrected for site effects. Apparent velocities greatly affect the ability to detect seismic deformations: for the same ground motions, slower waves induce higher strains and thus are more favorably detected than fast waves. The effect of apparent velocity on the ability to detect seismic phases, quantified by expected signal-to-noise ratios, is investigated by comparing signal amplitudes predicted by an earthquake model to recorded noise levels. DAS detection capabilities on underwater fibers are found to be similar to those of nearby broadband sensors, and superior to those of on-land fiber segments, owing to lower velocities at the ocean-bottom. The results demonstrate the great potential of underwater DAS for seismic monitoring and earthquake early warning. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	ambient noise; distributed acoustic sensing; earthquake seismology; ocean-bottom seismology; signal to noise; strain measurements
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/187274
作者单位	Université Côte d’Azur, CNRS, Observatoire de la Côte d’Azur, IRD, Géoazur, France; Department of Electronics, University of Alcalá, Alcalá de Henares, Spain; Instituto de Óptica, CSIC, Madrid, Spain; Aix Marseille University, CNRS/IN2P3, CPPM, Marseille, France; Febus Optics, Pau, France; NCSR Demokritos, Institute of Nuclear and Particle Physics, Ag. Paraskevi Attikis, Athens, Greece
推荐引用方式 GB/T 7714	Lior I.,Sladen A.,Rivet D.,et al. On the Detection Capabilities of Underwater Distributed Acoustic Sensing[J],2021,126(3).
APA	Lior I..,Sladen A..,Rivet D..,Ampuero J.-P..,Hello Y..,...&Markou C..(2021).On the Detection Capabilities of Underwater Distributed Acoustic Sensing.Journal of Geophysical Research: Solid Earth,126(3).
MLA	Lior I.,et al."On the Detection Capabilities of Underwater Distributed Acoustic Sensing".Journal of Geophysical Research: Solid Earth 126.3(2021).