Extraction of crustal deformations and oceanic fluctuations from ocean bottom pressures

Keisuke Ariyoshi, Hiroyuki Matsumoto, Takeshi Iinuma, Akira Nagano, Takuya Hasegawa, Motoyuki Kido, Naoki Uchida, Toshihiro Igarashi, Yusuke Yamashita

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

3 Citations (Scopus)

Abstract

DONET (Dense Oceanfloor Network system for Earthquakes and Tsunamis) has been developed and installed around Nankai Trough, which is motivated by the 2004 Sumatra-Andaman Earthquake. DONET contains pressure gauges as well as seismometers, which are expected to detect crustal deformations driven by peeling off subduction plate coupling process. From our simulation results, leveling changes are different sense among the DONET points even in the same science node. On the other hand, oceanic fluctuations such as melting ice masses through the global warming have so large scale as to cause ocean bottom pressure change coherently for all of DONET points especially in the same node. This difference suggests the possibility of extracting crustal deformations component from ocean bottom pressure data by differential of stacking data. However, this operation cannot be applied to local-scale fluctuations related to ocean mesoscale eddies and current fluctuations, which affect ocean bottom pressure through water density changes in the water column (from the sea surface to the bottom). Therefore, we need integral analysis by combining seismology, ocean physics and tsunami engineering so as to decompose into crustal deformation, oceanic fluctuations and instrumental drift, which will bring about high precision data enough to find geophysical phenomena.

Original languageEnglish
Title of host publicationOCEANS 2016 MTS/IEEE Monterey, OCE 2016
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781509015375
DOIs
Publication statusPublished - 2016 Nov 28
Event2016 OCEANS MTS/IEEE Monterey, OCE 2016 - Monterey, United States
Duration: 2016 Sep 192016 Sep 23

Publication series

NameOCEANS 2016 MTS/IEEE Monterey, OCE 2016

Other

Other2016 OCEANS MTS/IEEE Monterey, OCE 2016
CountryUnited States
CityMonterey
Period16/9/1916/9/23

Keywords

  • Climate change
  • Environmental experiment of ocean bottom pressure gauge
  • Kuroshio current
  • Subduction zone
  • Tonankai earthquake

ASJC Scopus subject areas

  • Instrumentation
  • Oceanography
  • Ocean Engineering

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