Mr. Aggelos Kalafatis Profile

Aggelos Kalafatis

at Univ of Patras

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Proceedings Article | 19 October 2023 Paper

Mapping ground deformation in Turkey after earthquake using SAR imagery

Aggelos Kalafatis, Aggeliki Kyriou, Konstantinos Nikolakopoulos

Proceedings Volume 12734, 1273416 (2023) https://doi.org/10.1117/12.2679466

KEYWORDS: Earthquakes, Deformation, Stanford Linear Collider, Synthetic aperture radar, Interferometry, Interferograms, Image processing, Interferometric synthetic aperture radar, Satellites, Image segmentation

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Synthetic Aperture Radar (SAR) interferometry has been deemed as an effective technique for the monitoring of earthquake-induced ground deformation since the early 1990s. Thereafter, several scientists have been engaged in understanding earthquake deformation using active remote sensing sensors. The East Anatolian Fault (EAF) constitute the major tectonic fracture in the wider region of Turkey and Middle East. In fact, this strike-slip fault zone regulates the tectonic movement between the Anatolian and the Arabian microplates. On February 6th, 2023, doublet earthquakes occurred on the southern part of EAF. The event has reported among the most devastating of 20th century. In this regard, the current research focuses on the mapping and analysis of ground deformation occurred in the wider area using spaceborne radar imagery. In this context, Sentinel-1 data covering the area was obtained and processed through Differential SAR interferometry (InSAR) and pixel offset method. In addition, ALOS-2 PALSAR-2 images were submitted to change detection approach based on the subtraction of two SAR images. The main difference between the two sensors is: a) Band difference i.e. Sentinel-1 is a C-band mission while ALOS-2 PALSAR is a L-band, b) different polarization. The analysis of the results revealed the spatial distribution of the ground deformation along the EAF. The observed deformation is in line with a left-lateral fault type.

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