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It is essential to observe seismic activities on the sea floor just above the seismogenic zones where large earthquakes have been occurred. We have developed UT-OBCS, a new ocean bottom cabled seismometer for a high density seismic array network, with utilizing ICT (Information and Communication Technologies), i.e., IP (Internet Protocol) on the seafloor. UT-OBCS is a compact and low cost system....
High dense marine seismic observation is a key to understand earthquake system beneath oceans. We have been developing long-term ocean bottom seismometers (OBSs), which are able to store more than a year continuous seismic records on sea bottoms, since end of the 20th century, and they enable us to acquire many earthquake data when we have a high dense seismic network in marine region. In the last...
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...
To install seismometers and tsunami-meters on the sea floor is necessary for monitoring seismic activities of a seismogenic zone. An ocean bottom cable seismometers system (OBCS) is most suitable for this purpose since data can be obtained in real-time. Some systems have been installed over the past 25 years around Japan. Although the existing OBCS systems are useful for the study of seismic activities,...
An ocean bottom cabled seismometer (OBCS) is the best solution for the monitoring of earthquake activity in a seismogenic zone where big or huge earthquakes have occurred repeatedly. However, the number of existing OBCS has been insufficient for high resolution observation of the seismogenic zone, due to the high costs involved. In order to lower the cost of OBCS and to meet requirements for flexibility...
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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