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In this paper we report the fiber optic ocean bottom seismograph (FOBS) system which is promising to be installed in the Ocean Bottom Observation Network (OBON). The FOBS system consists of an ocean bottom seismometer and a demodulator. The fiber laser sensors are used in the seismometer to detect the seismic signal. There are four sensors, three fiber laser accelerometers (FLA) and one fiber laser...
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