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For past ten years, the technology for ocean bottom seismic observation has been greatly developed. As a result, various seismic observations have been carried out around Japan and new geophysical findings are obtained. For sea floor seismic observation, Long-Term Ocean Bottom Seismometer (LT-OBS) and Broad Band OBS (BB-OBS) were developed. As a result of long term observations, precise seismicity...
The Japanese islands are positioned near the plate convergent zones, and large earthquakes have repeatedly occurred in marine areas around Japan. Although there are already approximately 2,000 land-based earthquake observatories in Japan, the number of permanent earthquake observatories in the oceans is quite limited. It is important to observe seismic activities on the seafloor just above these seismogenic...
An ocean bottom cable system (OBCS) is the best solution for monitoring the tectonic activities in a seismogenic zone. However the number of seismometers of the existing OBCS is insufficient for high resolution observation of the seismogenic zone, because the cost of the OBCS has been very expensive. In order to solve this problem, the authors have studied new cost effective OBCSs with 40 seismic...
An ocean bottom cable system (OBCS) is the best solution for monitor the tectonic activities in a seismogenic zone. However the number of seismometers of the existing OBCS is insufficient for high resolution observation of the seismogenic zone, because the cost has been very expensive. In order to lower the cost of OBCS, authors have studied cost analysis of existing OBCS in depth jointly with engineers...
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...
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