Scientific survey and monitoring of the off-shore seismogenic zone with Tokai SCANNER: submarine cabled network observatory for nowcast of earthquake recurrence in the Tokai region, Japan

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, we have just started an electromagnetic and seismological monitoring by using long submarine cables off Toyohashi, the southwest Japan Island. The cables are located on the Tokai seismogenic zone, where both slow-slipping and locked zones are obvious by GPS observation. Here, we introduce the recent and upcoming situations of the project.