1. Earth Observatory of Singapore, Nanyang Technological University, Singapore 639798;
2. Private address, Bogor 16810, Jawa Barat, Indonesia;
3. Insight Centre for Data Analytics, Hamilton Institute, Maynooth University, County Kildare W23 F2K8, Ireland;
4. Centre for Islamic Studies, University of Oxford, OX3 0EE Oxford, United Kingdom;
5. Department of Geophysics, Syiah Kuala University, Banda Aceh 23111, Indonesia