Development and Operation of an Ocean Bottom Cable Seismic and Tsunami (OBCST) Observation System in the Source Region of the Tohoku‐oki Earthquake

Cabled seafloor seismic and tsunami observation systems are ideal for marine geophysical monitoring because the data can be obtained in real time. We have developed a new compact seafloor‐cable seismic and tsunami observation system using Information and Communication Technology (ICT). Our system ac...

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Bibliographic Details
Published in:Earth and space science (Hoboken, N.J.) N.J.), 2021-03, Vol.8 (3), p.n/a
Main Authors: Shinohara, Masanao, Yamada, Tomoaki, Uehira, Kenji, Sakai, Shin'ichi, Shiobara, Hajime, Kanazawa, Toshihiko
Format: Article
Language:English
Subjects:
Communications networks
Data transmission
Earthquakes
Ethernet
Gauges
Information and Communication Technology
Internet Protocol
Linux
marine seismic and tsunami observation
Noise levels
Ocean bottom
Ocean floor
Power
Pressure gauges
Real time
seafloor cable
Seismic activity
Sensors
Sustainability
Technology
Tsunamis
Wave division multiplexing
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Summary:Cabled seafloor seismic and tsunami observation systems are ideal for marine geophysical monitoring because the data can be obtained in real time. We have developed a new compact seafloor‐cable seismic and tsunami observation system using Information and Communication Technology (ICT). Our system achieves reliability through redundancy using ICT. A software‐based system using up‐to‐date electronics technology contributes to cost reduction and production sustainability. The system named the Ocean Bottom Cable Seismic and Tsunami (OBCST) observation system was installed on the Pacific Ocean floor off Sanriku, northeast Japan, in September 2015, in the source area of the 2011 Tohoku‐oki earthquake. The purpose of the installation is to monitor seismic activity better and to observe tsunami activity through spatially dense observation. The system has been continuously collecting the seismic and pressure data since the deployment. For the seismic data, ambient seismic noise is comparable to that from a previous cable observation system. One observation node is buried 1 m below the seafloor and has a lower noise level compared to nodes on the seafloor. Because the noise levels are stable, many local earthquakes and teleseismic events have been recorded by the system. The data obtained by high‐precision pressure gauges have a resolution of
ISSN:2333-5084
2333-5084
DOI:10.1029/2020EA001359