Simultaneous automatic monitoring of deep non-volcanic tremor and very low-frequency earthquake in the Bungo Chennel region, southwest Japan

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To investigate activity of deep non-volcanic tremor and very low-frequency earthquake in the Bungo Channel region, the westernmost part of slow-earthquake region in southwest Japan, we modified the data-logging system of broadband seismic station in Hiburijima Island (Uwajima City, Ehime Prefecture), and also installed a new broadband seismic station in Tsurumisaki Peninsula (Saiki City, Oita Prefecture). From analyses of the data from those stations, it has been shown that about 85 % of non-volcanic tremors are associated with very low-frequency earthquakes, and they share the common source region.