*Tarudee Autaijaratrasmee¹, Satoru Tanaka², Kenji Kawai¹, Sutthipong Noisagool³ (1.Department of Earth and Planetary Science, School of Science, The University of Tokyo, Hongo 7-3-1, Bunkyo, Tokyo 113-0033, Japan, 2.Research Institute for Marine Geodynamics (IMG) Volcanoes and Earth’s Interior Research Center (VERC) Geophysical Research Group, Japan Agency for Marine-Earth Science and Technology, 3.Department of Physics, Mahidol University, 999 Phutthamonthon Sai 4 Rd, Salaya, Phutthamonthon District, Nakhon Pathom 73170, Thailand)