GPS/acoustic experiment for precise seafloor positioning across the Japan Trench

Author

Kanazawa, Toshihiko ; Osada, Yukihito ; Shiobara, Hajime ; Fujimoto, Hiromi ; Miura, Shun ; Sweeney, Aaron ; Hildebrand, John ; Chadwell, Dave

Author_Institution

Earthquake Res. Inst., Univ. of Tokyo, Japan

fYear

2002

fDate

6/24/1905 12:00:00 AM

Firstpage

251

Lastpage

253

Abstract

We have started the GPS/acoustic experiment for precise seafloor positioning across the Japan Trench. We developed precision acoustic transponders for the deep seafloor jointly with Scripps Institution of Oceanography and deployed them on the seafloor of the Pacific plate at the depth of 5,500 m. We found that resolution of the GPS positioning at baseline length of 350 km was about 1 cm. We developed another acoustic transponder system for the shallow seafloor and deployed 3 units on the landward slope off Kamaishi. We expect that repeated GPS/A measurements for seafloor geodesy will detect the different plate motions across the Japan Trench.

Keywords

Global Positioning System; geodesy; geophysical equipment; tectonics; transponders; underwater sound; 5500 m; GPS/acoustic experiment; Japan Trench; Kamaishi; Pacific plate; acoustic transponder system; deep seafloor; precise seafloor positioning; precision acoustic transponders; shallow seafloor; Acoustic measurements; Earthquakes; Geodesy; Global Positioning System; Power cables; Sea floor; Sea measurements; Sea surface; Seismic measurements; Transponders;

fLanguage

English

Publisher

ieee

Conference_Titel

Underwater Technology, 2002. Proceedings of the 2002 International Symposium on

Print_ISBN

0-7803-7397-9

Type

conf

DOI

10.1109/UT.2002.1002434

Filename

1002434