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We developed a new ocean bottom seismometer (OBS) that can be deployed to the ocean floor to 9,000 m depth. We conducted the first observations using the device. Conducting seismic observations in waters deeper than 6,000 m had been difficult because the maximum applicable depth of conventional ocean bottom seismometers is 6,000 m. The Japan Trench, where the Great East Japan Earthquake occurred,...
We have developed a prototype of new ocean bottom seismometer (OBS) for 3D seismic observation. This paper presents our design goal and general description of the prototype. Conventional OBSs are not operative enough for large operation and may have some compromises on mechanical transmission response. The new OBS is designed to achieve compactness, user-friendliness, and data integrity of short-period...
Ceramics have some outstanding features that are necessary for pressure-tight housings, such as higher compressive strength, lower specific gravity, and higher resistance against corrosion. One promising application is pressure-tight housings for a free-fall popup ocean-bottom seismometer (OBS). Ceramic pressure-tight housings can provide sufficient strength and buoyancy even at 11-km water depth...
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