Yue-Gau Chen^1,2, Kuan-hua Chen², Yu-Ting Kuo³, Chin-Shang Ku^2,3, Bor-Shouh Huang³, Carlos Tatapu⁴, Clinton Roga⁴ and Douglas Billy⁴, (1)Research Center for Environmental Changes, Academia Sinica, Taipei, Taiwan, (2)Department of Geosciences, National Taiwan University, Taipei, Taiwan, (3)Institute of Earth Sciences, Academia Sinica, Taipei, Taiwan, (4)Geological Survey Division, Ministry of Mines, Energy & Rural Elect, Honiara, Solomon Islands