自己浮上式海底地震計の位置精度

概要

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The accuracy of the Pop-up Ocean-Bottom Seismometer (ERI-P79) was tested on the cruise of the R/V Hakuho-Maru (University of Tokyo, Ocean Research Institute) in Feburary-March of 1980 in the Japan Trench and the Bonin Trench regions. The location of the OBS (Ocean-Bottom Seismometer) on the sea-floor is determined to be halfway between the point where it was dropped from the ship and the point where it surfaced. An accuracy of ±0.1 nautical mile, referred to the satellite position, was achieved by careful operations during both the deployment and the recovery. Recommended for these operations are : (1) for deployment, one should drop the OBS at the satellite update time, and also measure and correct the Loran position to the satellite position and (2) for recovery, one should wait at the drop position for the OBS to surface and then pick it up as soon as possible.
1982-07-16