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Bottom pressure gauges are widely used for tsunami registration. Along with tsunami signal, bottom pressure records contain high-frequency fluctuations that arise due to seismic and hydroacoustic waves. Exceeding the tsunami signal in amplitude, these high-frequency fluctuations can completely disguise tsunami signal, especially in the vicinity of tsunami source. For the detection of a tsunami in real-time and for the monitoring of ocean bottom deformation it is important to effectively filter the bottom pressure signal. In this study, we design a three-step decimation filter which allows to effectively select signals of tsunami and ocean-bottom deformation. The Tokachi-oki tsunamigenic earthquakes of 2003 and 2008 are taken as examples to demonstrate the efficiency of the new filter.

Decimation Filter Designed for Application to Real-time Bottom Pressure Records