Title :
Plan and technological difficulties on NanTroSEIZE long term borehole monitoring system
Author :
Kyo, Masanori ; Saruhashi, Tomokazu ; Sawada, Ikuo ; Namba, Yasuhiro ; Araki, Eiichiro ; Kitada, Kazuya ; Kimura, Toshinori
Author_Institution :
Japan Agency for Marine-Earth Sci. & Technol. (JAMSTEC), Yokohama, Japan
Abstract :
IODP (Integrated Ocean Drilling Program) scientific drilling proposal 603 (NanTroSEIZE: Nankai Trough Seismogenic Zone Experiment) not only proposes drilling, coring, geological analyzing, and geophysical logging, but also mandates that several long term borehole monitoring systems (LTBMS) should be installed at Nankai trough, where we expect to encounter the mega splay fault and the locked region of mega thrust fault, respectively, in order to understand on the dynamics of seismogenic zone. Borehole is not mere relic after core sampled, but should be sufficiently utilized as the scientific legacy hole to monitor the interior of the Earth. The advantage of LTBMS is to simultaneously manage precise monitoring on various parameters at multiple layers in the same borehole. Its technological difficulties are hiding in establishing the reliable and robust system against deploying long and narrow structure into tiny borehole through the ocean current from the heaving surface vessel. Also, for deeper penetration, higher temperature and pressure cause many problems on the system. This paper describes the plan of NanTroSEIZE LTBMS and its technological difficulties including some results on our development.
Keywords :
faulting; oceanographic regions; oceanographic techniques; IODP scientific drilling proposal 603; NanTroSEIZE LTBMS; NanTroSEIZE long term borehole monitoring system; Nankai trough; geological analyzing; geophysical logging; mega splay fault; mega thrust fault; ocean current; seismogenic zone; Field programmable gate arrays; Monitoring; Power supplies; Telemetry; Temperature measurement; Temperature sensors;
Conference_Titel :
Underwater Technology (UT), 2011 IEEE Symposium on and 2011 Workshop on Scientific Use of Submarine Cables and Related Technologies (SSC)
Conference_Location :
Tokyo
Print_ISBN :
978-1-4577-0165-8
DOI :
10.1109/UT.2011.5774151