1. Faculty of Mining and Petroleum Engineering, Bandung Institute of Technology (ITB), Jalan Ganesha 10, Bandung, West Java 40132, Indonesia, endra@lppm.itb.ac.id
2. Indonesian Institute of Science (LIPI), Jalan Cisitu, Sangkuriang, Bandung, West Java 40135, Indonesia
3. Faculty of Earth Science and Technology, Bandung Institute of Technology (ITB), Jalan Ganesha 10, Bandung, West Java 40132, Indonesia
4. Indonesian Agency for Meteorological, Climatological and Geophysics (BMKG), Jalan Cemara No. 66, Sukajadi, Bandung, West Java 40161, Indonesia
5. Graduate School of Environmental Studies, Nagoya University, D2‐2 (510), Furo‐cho, Chikusa‐ku, Nagoya, Aichi 464‐8601, Japan
6. Faculty of Science and Technology, Kochi University, Akebono‐cho 2‐5‐1, Kochi 780‐8520, Japan
7. Tono Research Institute of Earthquake Science, 1‐63, Yamanouchi, Akiyo‐cho, Mizunami, Gifu 509‐6132, Japan
8. Graduate School of Science, Tohoku University, 2 Chome‐1‐1 Katahira, Aoba Ward, Sendai, Miyagi 980‐8577, Japan
9. Department of Physics, Syiah Kuala University, Jalan Teuku Nyak Arief, Darussalam, Banda Aceh, Aceh 23111, Indonesia