1. Institute of Space Science; National Central University; Chung-Li; Taiwan
2. Institute of Seismology and Volcanology; Hokkaido University; Sapporo; Japan
3. Department of Geophysics, Graduate School of Science; Kyoto University; Kyoto; Japan
4. Department of Earth Science; National Cheng Kung University; Tainan; Taiwan
5. Center Weather Bureau; Taipei; Taiwan