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Temperature Measurements in ~ 1 km Borehole of TCDP

Temperature Measurements in ~ 1 km Borehole of TCDP. Jim Mori, Yasuyuki Kano, Takeshi Yanagidani DPRI Kyoto Univ. Hisao Ito JAMSTEC. Taiwan Chelungpu Fault Drilling Project - TCDP.

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Temperature Measurements in ~ 1 km Borehole of TCDP

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  1. Temperature Measurements in ~ 1 km Borehole of TCDP Jim Mori, Yasuyuki Kano, Takeshi Yanagidani DPRI Kyoto Univ. Hisao Ito JAMSTEC

  2. Taiwan Chelungpu Fault Drilling Project - TCDP Taiwan Chelungpu Fault Drilling Project - TCDP

  3. Quartz Oscillator Thermometer and Pressure Sensor resolution 0.001 oC

  4. Temperature Measurements March 2005

  5. Platinum Resistance Temperature Detector Resolution 0.003 oC

  6. Temperature Stabilization of Borehole May 18 July 2

  7. Temperature Measurements lowering 1.0 m/min raising 0.4 m/min

  8. Results Kano et al., 2006

  9. Results Temperature signal very small ! ・ Heat is very small ・ Dynamic friction level is very small (smaller than standard rock mechanics values) ・ Important for dynamic friction mechanisms

  10. Problems Temperature is close to noise level Effect of water flow ? Depth dependent values of heat capacity ? => Need measurements soon after earthquake

  11. Need for Quick Measurement 1 year after earthquake 6 year after earthquake

  12. Platinum Resistance Thermistors Resolution 0.001 oC

  13. Temperature Stabilization • - Noise Level

  14. Conclusions - Very low values of heat measured at 1 km depth after 6 years at TCDP - Takes about 120 days for temperature to stabilize after drilling - Noise levels in temperature measurements are about 0.01 oC - Want repeated time measurements over months to years

  15. Installing Temperature Sensor in Chelungpu Fault, Taiwan (March 2005)

  16. (Officer, 1974) S = Strength of heat source/area a = heat diffusivity Used Grid Search to find S and a Plane Heat Source = S

  17. 2005 Temperature Measurements t=1.2 MPa u = 5 meters fault displacement c = 1140 J/(Kg oC) specific heat ρ = 2500 Kg/m3 density m= 0.08 sn = lithostatic stress at 325 m sp = 1/3 * sn

  18. Effect of Water Flow Kano et al., 2006

  19. 水晶温度計

  20. 水晶温度計

  21. 白金温度計

  22. 白金温度計

  23. 白金温度計の設置

  24. Resolution of quartz wt. length, diameter, resol resolution of pressure sensor hakkin -name, resolution Figure of time for 1 km hole and 300 km Speed of temperature measurements Photo of hakkin Photos of new sensor, what kind ? resolution

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