Damage Assessment of the 2022 Cianjur Earthquake using Satellite-based Damage Proxy Map Suci Ramayanti (a*), Revita Anindya Lestari (a), Chang-Wook Lee (b)
a) Physics Study Program, Faculty of Mathematics and Natural Sciences Education Universitas Pendidikan Indonesia, Bandung, Indonesia
*suciramayanti[at]upi.edu
b) Department of Science Education, Kangwon National University, Chuncheon-si, Gangwon-do, Republic of Korea
Abstract
On 21 November 2022, an earthquake struck Cianjur, West Java, Indonesia, with the epicentre approximately 11 kilometres southwest of Cianjur and a shallow depth of 10 kilometres. This earthquake is believed to have originated from the Cimandiri Fault, which is characterised by a strike-slip mechanism, although it is likely that other as yet unidentified faults contributed to the event. This seismic event caused widespread damage to buildings and infrastucture, resulting in loss of life, injuries, and displacemen of residents. To approximate damage areas caused by the earthquake by the earthquake, we used the damage proxy map (DPM) method using Sentinel-1 Synthetic Aperture Radar (SAR) imagery. Two Sentinel-1 data acquired on 11 and 23 November with ascending path and VV polarisation, were used to analyse changes in the area before and after the earthquake. The results show that the DPM method is effective in identifying areas affected by the earthquake, with the most severe damage concentrated in the Cugenang area. The accuracy of these findings was validated through a comparison between the damaged areas identified by the DPM method and field surveys conducted by the Centre for Volcanology and Geological Hazard Mitigation (PVMBG). This study demonstrates the ability of DPM to efficiently support post-earthquake damage assessment and has the potential to serve as a reference for disaster response and mitigation planning.
