Estimation of Seismic Centroid Moment Tensor Using Ocean Bottom Pressure Gauges as Seismometers

Tatsuya Kubota, Tatsuhiko Saito, Wataru Suzuki, Ryota Hino

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

We examined the dynamic pressure change at the seafloor to estimate the centroid moment tensor solutions of the largest and second largest foreshocks (Mw 7.2 and 6.5) of the 2011 Tohoku-Oki earthquake. Combination of onshore broadband seismograms and high-frequency (~20–200 s) seafloor pressure records provided the resolution of the horizontal locations of the centroids, consistent with the results of tsunami inversion using the long-period (≳10 min) seafloor pressure records although the depth was not constrained well, whereas the source locations were poorly constrained by the onshore seismic data alone. Also, the waveforms synthesized from the estimated CMT solution demonstrated the validity of the theoretical relationship between pressure change and vertical acceleration at the seafloor. The results of this study suggest that offshore pressure records can be utilized as offshore seismograms, which would be greatly useful for revealing the source process of offshore earthquakes.

Original languageEnglish
Pages (from-to)10,907-10,915
JournalGeophysical Research Letters
Volume44
Issue number21
DOIs
Publication statusPublished - 2017 Nov 16

Keywords

  • CMT analysis
  • dynamic pressure change
  • ocean bottom pressure gauge
  • offshore interplate earthquake
  • seismometer

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

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