1. Graduate School of Science and Engineering, Kagoshima University, Kagoshima, Japan
2. Department of Earth Sciences, Faculty of Education, Saitama University, Saitama, Japan
3. Academia Sinica, Institute of Earth Sciences, Taipei, Taiwan
4. Department of Geosciences, National Taiwan University, Taipei, Taiwan
5. Faculty of Engineering and Design, Kagawa University, Takamatsu, Japan