Scholarly record
CO-SEISMIC SURFACE DISPLACEMENTS AFTER THE EARTHQUAKES IN LARISSA, 3 MARCH 2021, DERIVED BY DINSAR
Abstract
The focus of this study is detection of the deformations of the Earth's surface caused by March 3 2021 earthquake using Differential Interferometric Radar Synthetic Aperture technique. This method takes advantage of the remotely sensed SAR data provided at no cost by ESAs’ Sentinel-1 mission which are often used for creation of topographic maps as well as for detection of ground motions. The final results of this processing deliver reliable information about the displacements caused by the mentioned events with centimeter accuracy. The DInSAR approach is based on precise measurements of the phase of the backscattered from the surface radar signal at different dates of acquisition. Based on the differences registered in both signals conclusions on the relative motions are drawn from the created interferometric image (IFI). In the course of the IFI formation a measure of its quality, named coherence, is created too. It needs to be emphasized that the registered ground displacements are in the line-of-sight of the radar and after additional calculations can be transformed into subsidence values. For this research produced were IFIs from two ascending (south-north) and two descending (north-south) orbits of the satellite which provided more details on the occurred ground motions after all earthquake events. The time period covered by the IFIs is from February 25th 2021 to March 20th 2021. The results obtained exhibited high values in the coherence images which guarantee reliability of the final information. All geocoded IFIs were co-registered to the first one which is produced. After that several profile lines reflecting the surface displacements resulting from the events were produced.
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References5
https://www.emsc-csem.org/Earthquake/earthquake.php?id=954327#summary.
http://dggsl.geol.uoa.gr/en_index.html [3]https://sentinels.copernicus.eu/web/sentinel/user-guides/sentinel-1-sar/product-types-processing-levels.
http://step.esa.int/main/toolboxes/snap/.
Nikolov Hristo, Valentina Protopopova, Mila Atanasova. Studying seismic events via satellite interferometry. Proceedings Volume 11524, Eighth International Conference on Remote Sensing and Geoinformation of the Environment (RSCy2020);Paphos, Cyprus, 15241B, 11524, SPIE 2020, Proceedings of SPIE - The International Society for Optical Engineering, 2020, 11524, 115241B, 2020, ISBN:978-151063857-0, ISSN:0277786X, DOI: 10.1117/12.2570676, 1-16.
Atanasova M., Nikolov H., Protopopova V.. DInSAR in displacement detection after seismic events. Proceeding 10th Congress of Balkan Geophysical Society, 18-22 September 2019, Albena Resort, Bulgaria, EAGE, 2019, DOI: 10.3997/2214-4609.201902642, 1-4.8].
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