Seafloor borehole observatory array for monitoring slow slip events in the Nankai Trough seismogenic zone

Eiichiro Araki, Yuya Machida, Demian Saffer, Katsuyoshi Kawaguchi, Toshinori Kimura

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Array of borehole observatories was established in the seafloor in the Nankai Trough seismogenic zone, in the south of Japan where large earthquake and Tsunami generation is expected in the future. These observatories are connected to seafloor cable observation network for continuous data acquisition to allow monitoring of crustal deformation in real-time and to help understand condition of seismogenic plate interface. In each borehole observatories, a series of sensors such as pore-fluid pressure, volumetric strain, and tiltmeter were installed as well as seismometers to gain enough sensitivity to identify episodic small slow slip events in seismogenic plate boundary. Observation data from these borehole observatories revealed existence of recurring slow slip events in off seismically locked zone of Tonankai earthquakes, which occurs rather frequently but small in magnitude (Mw 5.0- 5.6). Dense array of highly sensitive borehole observatories as well as observation of seafloor pressure to correct the effect of oceanographic loading, are needed to identify these small and slow events in the seafloor.

Original languageEnglish (US)
Title of host publication2018 OCEANS - MTS/IEEE Kobe Techno-Oceans, OCEANS - Kobe 2018
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781538616543
DOIs
Publication statusPublished - Dec 4 2018
Event2018 OCEANS - MTS/IEEE Kobe Techno-Oceans, OCEANS - Kobe 2018 - Kobe, Japan
Duration: May 28 2018May 31 2018

Publication series

Name2018 OCEANS - MTS/IEEE Kobe Techno-Oceans, OCEANS - Kobe 2018

Other

Other2018 OCEANS - MTS/IEEE Kobe Techno-Oceans, OCEANS - Kobe 2018
CountryJapan
CityKobe
Period5/28/185/31/18

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All Science Journal Classification (ASJC) codes

  • Computer Networks and Communications
  • Oceanography
  • Space and Planetary Science
  • Energy Engineering and Power Technology
  • Ocean Engineering
  • Acoustics and Ultrasonics
  • Instrumentation

Cite this

Araki, E., Machida, Y., Saffer, D., Kawaguchi, K., & Kimura, T. (2018). Seafloor borehole observatory array for monitoring slow slip events in the Nankai Trough seismogenic zone. In 2018 OCEANS - MTS/IEEE Kobe Techno-Oceans, OCEANS - Kobe 2018 [8559185] (2018 OCEANS - MTS/IEEE Kobe Techno-Oceans, OCEANS - Kobe 2018). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/OCEANSKOBE.2018.8559185