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کیتاموئژ نیون یاهدربراک و اه یروآ نف یلم سنارفنک

Displacement analysis of the Si-Sakht earthquake using SAR

interferometry

M Mozaffari a* , M Khoshlahje a , Y Maghsoudi a

a Geomatics Engineering Faculty, K.N. Toosi University of Technology, ValiAsr Street, Mirdamad cross, Tehran, 19967-
15433, Iran
Abstract: Investigating and analyzing crustal deformation fields caused by earthquakes is important for a better
understanding of seismic hazards and the growth of geological structures in tectonically active areas. Synthetic aperture radar
(SAR) data can provide detailed and spatially comprehensive information. Moreover, the interferometric SAR (InSAR) as an
ell-established technique enables us to measure ground deformation at a millimetric level. In this study, we applied the InSAR
method using Sentinel-1 data to the Si-Sakht earthquake (Mw 5.5) that occurred on 17 February 2021. This earthquake caused
heavy damage to a large number of surrounding villages and infrastructures. As this area is located in the south of the Dena
fault, it is considered that the fault's motions caused the surrounding area to move. The results of processing indicate the
ground surface displacement between -15 cm and 10 cm in line-of-sight direction. This displacement is in the vicinity of the
fault and shows different behavior along the north and south sides of the fault. Therefore, it can be observed the InSAR result
corroborates well with the Dena Strike-slip fault well-known behavior.

Keyword: ground displacement, Radar, Interferometric SAR, Sentinel-1, Si-Sakht Earthquake