音響切離し方式海底地震計(ERI-AR81型)

概要

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An acoustic release control has been attached to the Pop-Up OBS (Ocean-Bottom Seismometer), type ERI-P79. The main features of this device are its light weight (11.5 kg in air, 6.5 kg in water) and its easiness of handling which allows us to conduct array observation using many OBS's. The carrier frequencies are dual, 10.5 kHz and 11.0 kHz. FM modulation frequencies for control codes range from 7.8 Hz to 23.4 Hz for 8 channels. The unit has three control modes, (1) Call: inquiry about its presence, (2) Range: measurement of the direct distance, (3) Command : to activate the release mechanism. The device worked successfully up to direct distance of 8 km from the ship to the OBS. The units were tested in March of 1981 in the Sagami Bay and were used in the OBS array observations in June-July of 1981 in the northwest Pacific.
1982-07-16