CDEX developed a series of LTBMSs for the Nankai Trough Seismogenic Zone Experiment (NanTroSEIZE). These were designed to measure, with high accuracy and precision, changes in downhole pressure, tilt, earth motion, and temperature. These are also used to observe earthquakes and tectonic motion, after being installed in riserless boreholes, some of which reach the megasplay fault. Riser borehole LTBMS are still under development.
Direct monitoring data of faults will help clarify the developmental processes and formation reactions proceeding or following huge earthquakes or provide realtime information when such earthquakes strike.
- Develop monitoring systems that can measure high accuracy in-situ data such as pore-water pressure, temperature, earthquakes, or tectonic movement near the plate boundary.
- Develop and expand realtime observation network by connecting installed LTBMSs to the Dense Oceanfloor Network system for Earthquakes and Tsunamis (DONET).
- Develop sensor and data telemetry systems designed for high in situ temperature (>125ºC) and long-term (>5 years) operation for the ultra-deep riser hole.
- Installed an LTBMS in riserless Hole C0002G (Dec. 2010), and connected to DONET to obtain realtime data (seismic, strain, tilt, temperature, and pressure) in Feb. 2013.
- Installed an LTBMS in riserless Hole C0010A (Apr. 2016), and connected to DONET to obtain realtime data in Jun. 2016.
- Installed an LTBMS in riserless Hole C0006G (Feb. 2018).
- Evaluated high-temperature specifications for components of the high temperature telemetry system, and carried out environmental evaluation tests of prototypes (high-temperature, high-pressure, vibration, and shock).