INSAR-BASED CO-SEISMIC DISPLACEMENT MAPPING OF THE 2023 JAJARKOT EARTHQUAKE (MW 5.7) USING SENTINEL-1A IMAGERY
DOI:
https://doi.org/10.3126/jist.v31i1.89170Keywords:
Co-seismic displacement, InSAR, LOS displacement, Sentinel-1AAbstract
On November 3, 2023, Jajarkot district in western Nepal experienced a Mw 5.7 earthquake. The region is seismically active and lies along the Main Himalayan Thrust (MHT). Various slope failures and damages to many masonry structures were reported representing the effects of surface displacement. This study presents the first co-seismic surface displacement analysis of moderate-magnitude earthquake in western Nepal using Sentinel-1A Synthetic Aperture Radar (SAR) data processed through Interferometric SAR (InSAR) workflow. For data processing, Sentinel Application Platform (SNAP) and SNAPHU were employed followed by displacement decomposition in ArcGIS 10.4. The east-west displacement (DEW) ranged from 0.3514 m to -0.2210 m, while the vertical displacement (DV) varied between 0.4149 m to -0.5149 m. The total ground displacement magnitude was approximately 0.5437-0.5603 m. These findings show that even a moderate-magnitude earthquakes in the Himalayan terrain can produce significant and measurable displacement which highlights the effectiveness of InSAR in post-seismic hazard assessment for remote, data-scarce regions of Nepal.
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