Engineering Specifications on LTBMS Telemetry System for NanTroSEIZE 3.5 km Riser Hole

抄録

The international project supported by the Integrated Ocean Drilling Program (IODP) started in autumn in 2007 to drill the area off Kii Peninsula, Japan. This area is one of the most active earthquake zones in the world. In the final stage of this project, JAMSTEC plans to install the Long-Term Borehole Monitoring System (LTBMS) in 3.5 km and 6 km riser holes to take a direct look at activities of the plate boundary fault and splay faults above it. As a part of the development of this LTBMS, JAMSTEC started developing an experimental prototype (EXP) of the telemetry system with IODP funding in February 2007. In United States Fiscal Year (USFY) 2007, JAMSTEC defined the operational requirements on the LTBMS and the engineering specifications for its telemetry system with assuming the target hole as 3.5 km riser hole. In the process to define them, JAMSTEC confirmed feasibility of some technical features, such as high speed downhole data transmission, accurate time synchronization between land station and downhole systems, deployment, and so on. This paper describes the operational requirements for the LTBMS and the engineering specifications on the LTBMS telemetry system for NanTroSEIZE 3.5 km riser hole.