Pacific Array

Pacific Array

Recent advances in ocean bottom broadband seismometry, together with advances in the seismic analysis methodology, have enabled us to resolve the regional 1-D structure of the entire lithosphere/asthenosphere system, including seismic anisotropy, with deployments of ~15 broadband ocean bottom seismometers. Having ~15 BBOBSs as an array unit for a ~2-year deployment, and repeating such deployments in a leap-frog way or concurrently (an array of arrays) for a decade or so would enable us to cover a large portion of the Pacific basin. Such efforts, not only by giving regional constraints on the 1-D structure beneath Pacific ocean, but also by sharing waveform data for global scale waveform tomography, would drastically increase our knowledge of how plate tectonics works on this planet, as well as how it worked for the past 180 million years.


  • US Pacific Array (Old-ORCA) recovery cruise (2020/11/12-12/)
  • Oldest-2 array cruise proposal is funded by Taiwan's MOST (reported at JpGU2020 Online, 2020/07/15)
  • US Pacific Array (Old-ORCA) deployment cruise (2019/11/13-12/7)
  • Japan-Korean Oldest-1 recovery cruise (2019/10/26-11/9)
  • Two new US arrays are recommended for funding by NSF (reported at IUGG in Montreal, 2019/07/16)

  • US Young PacificORCA recovery cruise (2019/5/8-6/8)
  • Japanese-Korean Pacific Array deployment @ Oldest (2018/10/30-11/10)
  • Japanese-Korean Oldest Array deployment scheduled for 10/25-11/5 (2018/5/24)
  • Korean Oldest Array ship proposal funded (2018/4/17)
  • US Pacific Array deployment: Pacific ORCA (2018/4/6-5/7)
  • Japanese Oldest Array proposal funded (2018/4/3)

    • 2019 update (2019/12/31) Station symbols: Completed (black star); Being deployed (white star); Funded (open circle)
      people & rainbow

    • 2019 update (2019/08/01) Station symbols: Completed (black star); Being deployed (white star); Funded (open circle); Almost funded (i.e., recommended by NSF, open blue circle)

    • 2018 update (2019/02/18) Star: station deployed

    • 2017 update (2017/12/13)


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