T.-n. Goto

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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(More)
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(More)
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(More)
Mudflow associated with an earthquake of magnitude 5.5 was detected with a cabled observatory on deep seafloor off Hatsushima Island in Sagami Bay in April 2006. Environmental fluctuations associated with the mudflow were observed. Water current 12m above the seafloor observed by ADCP was 27 cm/s at maximum and several millimeter sedimentation was(More)
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(More)
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(More)
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(More)
Western part of Sagami Bay is one of the active tectonic areas in Japan. In this area, Teishi Knoll, volcanic scamount, erupted in 1989 and the earthquake swarms occurs repeatedly every few years in the eastern coast of the Izu Peninsula. The real-time deep sea floor observatory was deployed about 7 km off Hatsushima Island, Sagami Bay, at a depth of 1174 m(More)
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