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Earth, Planets and Space

, Volume 50, Issue 11–12, pp 905–911

First Online: 06 June 2014Received: 02 April 1998Revised: 03 July 1998Accepted: 17 July 1998


We have developed systems for measuring differential displacements across a fault zone, and examined their resolutions through seafloor experiments at relatively short baselines. A system for a seafloor extensometer makes use of precise acoustic ranging with a linear pulse compression technique. The system has a resolution better than 1 cm in acoustic ranging over a baseline of at least 1 km. The most critical problem is correction for temperature variations, and we estimate that the effect can be corrected with cm-order accuracy in the case of a deep-sea experiment. We have also examined a leveling system on the seafloor using an array of ocean bottom pressure gauges and an ocean bottom gravimeter to detect differential vertical motion. The system is estimated to have a resolution of several centimeters in vertical displacement. These system will be useful for triangulation and leveling on the seafloor, but we need further studies over a longer baseline and to achieve better long-term stability.

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Autor: Hiromi Fujimoto - Kin-ichiro Koizumi - Yukihito Osada - Toshihiko Kanazawa


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