NDLI: Recent progress in ocean bottom seismic observation and new results of marine seismology

Content Provider	IEEE Xplore Digital Library
Author	Shinohara, M. Kanazawa, T. Shiobara, H.
Copyright Year	2011
Description	Author affiliation: Earthquake Research Institute, University of Tokyo, 1-1-1, Yayoi, Bunkyo-ku, Tokyo 113-0032 Japan (Shinohara, M.; Kanazawa, T.; Shiobara, H.)
Abstract	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 in marine area, especially under the landward slope of the Japan and Kuril trenches, can be obtained. Ocean Bottom Cabled Seismometers (OBCS), where the sensors are equipped in a hermetically-sealed case and these cases are connected with cables, is the best solution for real-time observation in marine area. A new OBCS system to make a high density observation in the marine areas was developed recently. The first OBCS system with a total length of 25 km and 4 observation nodes was produced. The installation of the first OBCS system carried out in end of August, 2010. At the landing station, the data are stored to hard disks, and the data are transmitted to Ea data center. It is becoming clear that emplacement of seismometers into the crust can provide low noise environments. Four borehole geophysical observatories in the western Pacific area were constructed from 1999 to 2001 and the data from the borehole sensors were obtained for more than two years. The tiltmeters in the sea floor borehole recorded the earth tides clearly and structure of the oceanic plate is obtained using data from the borehole seismometers.
Starting Page	1
Ending Page	7
File Size	3323852
Page Count	7
File Format	PDF
ISBN	9781457701658
e-ISBN	9781457701641
DOI	10.1109/UT.2011.5774093
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-04-05
Publisher Place	Japan
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Sensors Earthquakes Observatories Sea floor Broadband communication Batteries
Content Type	Text
Resource Type	Article

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