5:15 PM - 7:15 PM
[O12-P01] Ground deformation associated with the 2025 Myanmar earthquake detected by ALOS-2/PALSAR-2 (Daichi-2) data
★Invited Papers
Keywords:InSAR, Ground deformation, Earthquake, The 2025 Myanmar earthquake
On March 28, 2025 (UTC), a magnitude 7.7 earthquake struck central Myanmar. ALOS-2/PALSAR-2 (Daichi-2), which is operated by the Japan Aerospace Exploration Agency (JAXA), acquired SAR images over the epicentral area as part of its disaster response operation. Geospatial Information Authority of Japan processed ALOS-2/PALSAR-2 data to reveal ground deformation associated with the earthquake. We applied Interferometric Synthetic Aperture Radar (InSAR) and pixel offset analysis to the ALOS-2/PALSAR-2 data to isolate the ground deformation. The pixel offset analysis allows us to detect ground deformation signals by extracting local offsets between the two co-registered SAR images. The azimuth offset (pixel offset in the along-track direction), which is sensitive to displacement in an approximately north-south direction, revealed a dislocation about 6 m across the Sagaing fault. Spatial characteristics of the ground deformation showed an almost northward displacement on the western side of the fault and an almost southward displacement on the eastern side of the fault, indicating right-lateral displacement. The displacement discontinuity along the Sagaing fault was detected from northern Mandalay to southern Naypyidaw, with the distance of more than 400 km in the north-south direction. Instead, the range offset (pixel offset in the cross-track direction) showed little significant displacement, implying that the the north-south displacement was dominant, with little east-west and vertical displacement components. The displacement discontinuity revealed by InSAR extended toward several tens of kilometers further south compared with that in the azimuth offset, bringing the total extent of fault rupture to just under 500 km.