1. Department of Civil Engineering, National Chiao Tung University, No. 1001, Daxue Road, East District, Hsinchu 30010, Taiwan, vvnchao@nctu.edu.tw
2. Institute of Hydrological and Oceanic Sciences, National Central University, No. 300, Zhongda Road, Jhongli 32001, Taiwan
3. Department of Earth Sciences, National Central University, No. 300, Zhongda Road, Jhongli 32001, Taiwan
4. Institute of Earth Sciences, Academia Sinica, No. 128, Section 2, Nankang District, Taipei, 11529, Taiwan
5. Department of Geosciences, National Taiwan University, No. 1, Section 4, Roosevelt Road, Da'an District, Taipei 10617, Taiwan
6. Seismological Observation Center, Central Weather Bureau, No. 64, Gongyuan Road, Taipei 10048, Taiwan
7. Also at Institute of Hydrological and Oceanic Sciences, National Central University, No. 300, Zhongda Road, Jhongli 32001, Taiwan.