New pop-up type Ocean Bottom Seismometer |
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| Authors: | Takao Eguchi Yukio Fujinawa Tadayoshi Matsuzaki Masaru Aoyagi |
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| Institution: | (1) National Research Center for Disaster Prevention, 3-1, Tennodai, Sakura, 305 Niihari, Ibaraki, Japan;(2) NEC Corporation, Tokyo, Japan |
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| Abstract: | We designed a new pop-up type Ocean Bottom Seismometer (OBS) in order to study micro-earthquakes in off-shore areas. With a 57 cm O.D. sphere of high tension aluminium alloy, the OBS system, including one vertical and one horizontal geophone, can safely operate on ocean floors of up to 6000 m depth for seismic observations. The amplified seismic data and the time code are directly recorded on the four-channel cassette deck for periods of up to one month. The frequency response curve throughout the recording and play-back system is flat for the range, 1–15 Hz (–3 dB). The anchor release and the geophone clamp are operated by an acoustic command signal.So far, we have deployed our OBS's 42 times in the ocean. All of the OBS's deployed have been recovered safely. Seismic data has provided seismological evidence for a number of processes associated with tectonism along subduction zones and spreading ridges (e.g., Eguchi et al., 1986). |
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