Center for Deep Earth Exploration
JAPANESE | SITE MAP | CONTACT IODP
HOME CHIKYU EXPEDITION About Us VISITOR'S GUIDE
HOME > CHIKYU > CHIKYU TECHNOLOGY DEVELOPMENT > Long Term Borehole Monitoring System
CHIKYU TECHNOLOGY DEVELOPMENT

Long Term Borehole Monitoring System (LTBMS)

Nankai Trough Seismogenic Zone Experiment (NanTroSEIZE) proposes not only drilling, coring, geological analysis, and geophysical logging, but also a long-term borehole monitoring system (LTBMS) to observe the seismogenic zone. LTBMS will be connected to a seafloor observatory network, to enable real-time monitoring and contribute to reducing the severity of earthquake-disasters.

Development plan

Development of the riser borehole LTBMS started in FY2007. The experimental prototype (EXP) was built for evaluation testing in a land-based well, using the results of the component level tests. After reviewed the EXP test results, the engineering prototype (ENP) will be built and installed in the riser borehole.

Conceptual image of LTBMS

Conceptual image of LTBMS

Schematic diagram of long term borehole monitoring system

Schematic diagram of long term borehole monitoring system

Technical challenges for the 3,500 m riser hole LTBMS

  • High temperature/long life (125°C / 5 years), low power consumption (for multi sensor)
  • Safe/reliable deployment (deep well, fault zone, shock resistance, retrieval)
  • Coupling to formation (cement, clamp)
  • Multi-level/multi-purpose monitoring (seismic, geodetic, hydro geologic), real-time monitoring
  • Accurate synchronization (for seismic array), wide frequency range/wide dynamic range
  • Miniaturization, system redundancy (fault tolerant)
CHIKYU STATUS | CHIKYU DATA | CHIKYU Science and Technology | CHIKYU TECHNOLOGY DEVELOPMENT |
CHIKYU TOUR | CHIKYU IMAGE | CHIKYU HISTORY | CHIKYU Q&A | CHIKYU NEWS
Back to top of page
Copyright 2006 JAMSTEC. ALL RIGHTS RESEVED. JAMSTEC website CDEX website