CDEX installed a temporary LTBMS for the Japan Trench Fast Drilling Project (JFAST). This was to measure the residual heat signature from the friction caused by the slip during the huge earthquake and tsunami of the 11 March 2011 Tohoku-oki mega-earthquake.
The JFAST Expedition had two main goals: collect geophysical data and core samples from the earthquake slip zone or fault, and deploy the LTBMS to measure the residual frictional heat produced by the earthquake.
CDEX helped develop the LTBMS measuring temperature, deployed in water 6897.5 m deep, installed in a borehole 854.8 m below the sea floor. This project successfully deployed and recovered the LTBMS, holding temperature data, including data from across the fault.
- Extremely precise temperature sensors (n=55) were deployed below the seafloor across the fault, as identified from core samples and logging-while-drilling data (Jul. 2012).
- After a 9-month deployment, the sensors were recovered by the deep-sea ROV KAIKO 7000II (Apr. 2013).
- Temperature data analysis revealed clear evidence of residual heat from the friction produced during the earthquake.
- These results were part of a series of high-impact science results published in the journal SCIENCE from the D/V Chikyu IODP JFAST expeditions.