Scientific results started appearing in the literature using realtime and continuous time series of data obtained on the seafloor for seismic and micro-tsunamic observations. The installed observatories are all operating to aid earthquake studies for disaster mitigation at the future potential hazards which take place at plate boundaries surrounding the Japanese islands. We summarize the latest scientific results from monitored data produced by our cabled observatories and, then, to demonstrate advantages of such underwater seismic and tsunamic stations. The development of offshore monitoring system must be well considered for profound perception of geophysical processes associated with offshore seismic activities.


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