Development of ocean bottom seismometer and pressure gauge for observation of earthquakes at plate boundary

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Ocean bottom seismometers are widely used for earthquake observation on sea floor at the present. However, a frequency band of observations is limited from 360s to 50Hz. Because an observation band of a pressure gauge is broad, addition of a pressure gauge to an ocean bottom seismometer is useful for study of earthquake generation. We developed an ocean bottom seismometer and pressure gauge, and carriedout observation in Nankai Trough region. In addition, the ocean bottom seismometer and pressure gauge was used for the aftershock observation for the 2011 Tohoku earthquake. The pressure gauges were recorded ocean tide, seismic waves and tsunamis of the 2011 event. The developed ocean bottom seismometer and pressure gauges are widely used for seafloor observation at the present.