Separate extraction of ocean infragravity waves and seismic waves by multi-scale very-broadband observation of water pressure

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We developed an ocean bottom high-resolution water pressure measuring system using a newly released water-pressure sensor counting quartz-oscillation frequency. We installed this observation system on the seafloor off Miyagi prefecture and recovered it after three months. We confirmed that seismic event with magnitudes less than 3 can be detected with high S/N ratios on the 20Hz-sampling records. We also confirmed that by adjusting the sampling rate, the system can record ground noise whose rms amplitude is three orders of magnitude lower than the tremor amplitude in seismically quiet days.