The February 6, 2023, Earthquakes in Turkey: A Model of the Rupture Surface Based on Satellite Radar Interferometry

Mikhailov, V.; Babayantz, I.; Volkova, M.; Timoshkina, E.; Smirnov, V.; Tikhotskiy, S.

Авторы: Mikhailov VO, Babayantz IP, Volkova MS, Timoshkina EP, Smirnov VB, Tikhotskiy SA
Журнал: Doklady Earth Sciences
Том: 511
Номер: 1
Год издания: 2023
Издательство: Maik Nauka/Interperiodica Publishing
Местоположение издательства: Russian Federation
Первая страница: 571
Последняя страница: 577
Оригинальные версии: ЗЕМЛЕТРЯСЕНИЯ В ТУРЦИИ 06.02.2023: МОДЕЛЬ ПОВЕРХНОСТИ РАЗРЫВА ПО ДАННЫМ СПУТНИКОВОЙ РАДАРНОЙ ИНТЕРФЕРОМЕТРИИ
DOI: 10.1134/S1028334X23600627
Аннотация: Two strike–slip faults, displacements along which caused the catastrophic earthquakes in Turkeyon February 6, 2023, were mapped from satellite radar interferometry data. According to the satellite data,the relative displacements of the sides of the East Anatolian Fault Zone (EAFZ), with which the first eventof Mw 7.8 was associated, exceeded 5 m in the central segment. The rupture surface extends from the area ofthe Doğanyol-Sivris earthquake Mw 6.7 of January 24, 2020, in the north to the Mediterranean coast in thesouth, where the earthquake Mw 6.3 occurred on February 20, 2023. The second event Mw 7.5 is associatedwith the Surgü-Çardak fault; the relative displacements of its sides, according to satellite data, exceeded 7 m.The obtained displacement fields of the Earth’s surface were used to construct a model of the seismic rupture.This model was worked out on the basis of the Pollitz, 1996 solution, which defines displacements on the surfaceof the spherically stratified planet as a result of along dip and strike displacements on a rectangular rupturelocated inside the sphere. Ignoring the spherical stratification of the planet leads to errors of up to 20%,especially in the presence of a large strike–slip component [5]. Ignoring sphericity also causes an error, whenusing the solution obtained for an elastic homogeneous half-space, as the US Geological Survey (USGS) hasdone, in modeling the seismic rupture for earthquakes in Turkey in 2023. Our model differs in the detailedconsideration of the fault geometry. For this purpose, the faults were approximated by 19 planes along thestrike, divided into two levels along the dip. In our rupture model strike–slip displacements in the central segmentof the EAFZ reached 12.7 m. In the southern segment of this rupture, the displacements are muchsmaller. It should be emphasized that we registered the displacements for the period from January 29, 2023,to February 10, 2023; therefore, together with co-seismic ones, they also include post-seismic displacementsfor four days after the main seismic events. The displacements on the rupture surface along the Surgü-ÇardakFault, where the Mw 7.5 earthquake occurred, were up to 10 m. The results demonstrate, in particular, theefficiency of application of the satellite radar interferometry in the operative study of catastrophic geodynamicphenomena and processes.
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The February 6, 2023, Earthquakes in Turkey: A Model of the Rupture Surface Based on Satellite Radar Interferometryстатья

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