1. Department of Physics, University of Bengkulu, Bengkulu 38371, Indonesia
2. Earth Observatory of Singapore, NTU , 639798 , Singapore
3. CAS Key Laboratory of Ocean and Marginal Sea Geology, South China Sea Institute of Oceanology, Innovation Academy of South China Sea Ecology and Environmental Engineering, Chinese Academy of Sciences , Guangzhou 511458, China
4. Research Center for Geological Disaster, National Research and Innovation Agency (BRIN) , Bandung 40135 , Indonesia
5. Asian School of the Environment, NTU , Singapore