GPS/acoustic seafloor positioning experiment in the subduction zone of the Japan trench

Hiromi Fujimoto, Satoshi Miura, Aaron Sweeney, Minoru Ito, Yukihito Osada, Toshihiko Kanazawa

Research output: Contribution to journalConference articlepeer-review


Planning to make in situ observations of seismic coupling and motion of the Pacific Plate near the Japan Trench (about 200 km from the coast), we deployed three precision acoustic transponders (PXPs) in 2001 on both the Pacific plate (70 km from the trench axis at a depth of 5450 m) and the landward slope (70 km from the axis at a depth of 2800 m). The PXP system was developed for the full ocean depth in collaboration with a group at the Scripps Institution of Oceanography. We confirmed precise ranging up to a 15 km slant range with the PXPs. We obtained an accuracy of 2-3 cm for the sea-surface kinematic GPS positioning at a baseline length of 350 km. We have confirmed the anchor stability through visual inspection of PXPs deployed on thick sediment of the old Pacific Plate.

Original languageEnglish
Pages (from-to)765-769
Number of pages5
JournalOceans Conference Record (IEEE)
Publication statusPublished - 2003
EventCelabrating the Past... Teaming Toward the Future - San Diego, CA., United States
Duration: 2003 Sept 222003 Sept 26


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