1. Graduate School of Engineering and Resource Science, Akita University, 1-1 Tegatagakuenmachi, Akita 010-8502, Japan.
2. Corresponding author.
3. Graduate School of Frontier Sciences, The University of Tokyo, Tokyo 277-8563, Japan.
4. Dia Consultants Co. Ltd, Tokyo 101-0032, Japan.
5. National Research Institute of Astronomy and Geophysics (NRIAG), Cairo 11421, Egypt.
6. Archaeology Department, College of Tourism and Archaeology, King Saud University, Riyadh 12372-7524, Saudi Arabia.
7. Graduate School of Engineering, The University of Tokyo, Tokyo 113-8656, Japan.
8. Research Institute for Science and Engineering, Waseda University, Tokyo 169-8555, Japan.
9. Geo-Research Institute, Osaka 550-0012, Japan.