Frictional melting and thermal pressurization during seismic slip controlled by drainage
- 1Department of Geology, Chinese Cultral Uviersity, Taipei, Taiwan (wuwenjay1012@msn.com)
- 2Graduated Institute of Geophysics, National Central University, Taoyuan, Taiwan (liweikuo@ncu.edu.tw)
- 3CAMRDA, National Central University, Taoyuan, Taiwan (chiaweik@alumni.stanford.edu)
- 4Department of Geosciences, University of Padova, Padova, Italy (weixin.wu@g.ncu.edu.tw)
- 5National Synchrotron Radiation Research Center, Hsinchu, Taiwan (hsheu@nsrrc.org.tw)
frictional melting and thermal pressurization are commonly proposed to reduce dynamic shear resistance along a fault during earthquake propagation. The key factor on triggering either thermal pressurization or frictional melting may be the hydraulic properties of surrounding rock. Observations in Taiwan Chelungpu-fault drilling project (TCDP) Hole-A and Hole-B suggest that frictional melting and thermal pressurization occurred along the fault during the Mw 7.6 Chi-Chi earthquake, but the underlying process is still unclear. Here, we present the microstructural observation in experimental and natural fault gouge, the mechanical data at seismic rate and mineralogical characteristics. Results show that amorphous material only occurred at drained condition. Taken together, these results imply that the difference between Hole-A and Hole-B is attributed to the drainage.
How to cite: Wu, W.-J., Kuo, L.-W., Kuo, C.-W., Wu, W.-H., and Sheu, H.: Frictional melting and thermal pressurization during seismic slip controlled by drainage, EGU General Assembly 2023, Vienna, Austria, 24–28 Apr 2023, EGU23-8389, https://doi.org/10.5194/egusphere-egu23-8389, 2023.
