Development of instruments for seafloor geodesy
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- Fujimoto Hiromi
- Ocean Research Institute, University of Tokyo
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- Koizumi Kin-ichiro
- Ocean Research Institute, University of Tokyo
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- Osada Yukihito
- Ocean Research Institute, University of Tokyo
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- Kanazawa Toshihiko
- Earthquake Research Institute, University of Tokyo
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Abstract
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.
Journal
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- Earth, Planets and Space
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Earth, Planets and Space 50 (11-12), 905-911, 1998
Society of Geomagnetism and Earth, Planetary and Space Sciences, The Seismological Society of Japan, The Volcanological Society of Japan , The Geodetic Society of Japan , The Japanese Society for Planetary Sciences
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Details 詳細情報について
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- CRID
- 1390001206509133824
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- NII Article ID
- 10003736412
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- NII Book ID
- AA11211921
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- ISSN
- 18805981
- 13438832
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- NDL BIB ID
- 1951572
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- Text Lang
- en
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed