2022-02-13 16:47:42
Seismic waves from earthquakes under the ocean floor can create acoustic reverberations in the sea, that then create more seismic signals as they propagate and reflect through the water column. Researchers have recently shown that they can study these interactions using a new laser-based technique which allow geophysicists to turn fiber-optic cables into thousands of seismic sensors–what is called Distributed Acoustic Sensing (DAS). In a new paper, researchers show how they used data from a straight-line DAS array located offshore the Sanriku Coast, Japan, to model what was happening in the ground near shore and how the acoustic waves in the water column – initiated by seismic waves – create more seismic surface waves on the ocean floor. They suggest that the method can be readily used to study many near-shore areas around the world that already have fiber optic telecommunication cables on the sea floor.
Source:
Subsurface Imaging With Ocean-Bottom Distributed Acoustic Sensing and Water Phases Reverberations,
Zack J. Spica, Jorge C. Castellanos, Loïc Viens, Kiwamu Nishida, Takeshi Akuhara, Masanao Shinohara, Tomoaki Yamada [2022] Geophysical Research Letters
DOI: 10.1029/2021GL095287
https://fal.cn/3lYUf
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645 viewsAlireza Rastegar, edited 13:47
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