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We have developed a new cost-effective scientific underwater cable system named Tokai Submarine Cabled Network Observatory for Nowcast of Earthquake Recurrences (Tokai-SCANNER) using a decommissioned optical underwater telecommunication cable. We have used this cable in two ways simultaneously: (1) to construct an ocean-bottom observatory at the end of the cable, and (2) to use the cable as a long...
A new cabled observatory Tokai SCANNER (Tokai Submarine Cabled Network Observatory for Nowcast of Earthquake Recurrences) was completed in April 2007. The system is located off the coast of Toyohashi-city where huge earthquakes are anticipated and continuous long-term monitoring is needed to promote seismic study. A new junction box which is equipped with underwater mateable connectors was installed...
A new cabled observatory was constructed off Toyohashi in central Japan using a pair of decommissioned underwater telecommunication cables. While providing electric power and communication line to the underwater observatory, the cables will be used as a long active antenna to monitor the electro-magnetic properties of the Earth's crust that are related to water contents. To secure a safe deployment...
Existence of fluid on seismogenic zones has a key role on great earthquakes. The electrical conductivity structures obtained by electromagnetic survey across the great earthquake zones show that the seismically locked zones correspond to the low conductive zones. The low conductivity is possibly interpreted as relatively low fluid content. For more discussion on the role of fluid to earthquake occurrence,...
A new cabled observation system off the coast of Toyohashi in central Japan is now being developed. The system uses a couple of former underwater optical telecommunication cables of about 60 kilo-meters long. The authors will use the cable in two ways simultaneously. One is to build a new observatory at the end of the cable. Underwater sensors including a broadband seismometer, a precise water-pressure...
A new cabled observatory off Toyohashi in central Japan is now being developed. In this area, mega-thrust earthquakes are anticipated, and continuous long-term monitoring is needed to promote seismic study and to mitigate disasters. It will use a pair of decommissioned underwater optical telecommunication cables of 60 kilometers in length. A new junction box will be deployed at the end of the cable...
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