SEISMICITY AND CRUSTAL SEISMOTECTONIC DEFORMATIONS OF THE ANATOLIAN PLATE (TURKEY)

Sycheva, N.А.

Автор: Sycheva N.А.
Журнал: Geodynamics & Tectonophysics
Том: 15
Номер: 1
Год издания: 2024
Издательство: Федеральное государственное бюджетное учреждение науки Институт земной коры Сибирского отделения РАН
Местоположение издательства: Иркутск
Первая страница: 0743
Последняя страница: 0743
DOI: 10.5800/gt-2024-15-1-0743
Аннотация: ABSTRACT. The paper deals with the study of seismicity and the crustal stress-strain state of Turkey whose tectonicsis caused by relative movements of the African, Aegean, Arabian, Anatolian, Black Sea and Eurasian plates. Seismotectonicdeformations (STD) were calculated using the approaches proposed by Yu.V. Riznichenko and S.L. Yunga. The distribution of seismicity, average annual STD rate (STD intensity), seismogenic rupture concentration parameter and the Tsallisparameter was plotted from the earthquake catalog data analysis (more than 300000 events for 1900–2022). The representative part includes the events with М≥2.5. The distribution of the above-mentioned parameters was calculated fora 0–40 km layer wherein most of the earthquakes are located. Deep-focus earthquakes occur at a depth to 170 km. Themaximum annual number of earthquakes (more than 90) was recorded in Balikesir Province. Seismicity and STD intensity analysis was made on the periods of 1997–2009 and 2010–2022 for the western and eastern parts of Turkey and forthe destructive February 6, 2023 earthquake area. The number of earthquakes recorded in the western part of Turkey(75 %) largely exceeds that recorded in the eastern part (25 %). In the period 2010–2022, there was an increase in thenumber of earthquakes in the eastern part of Turkey relative to the period 1997–2009, which made up 38 % of the totalnumber of earthquakes. The studies of STD direction are based on the earthquake focal mechanism data (807 events for1976–2023). STD intensity in the February 6, 2023 earthquake area, with regard to the February 6, 2023 earthquakes, is1.34⋅10–6 year–1, and the background intensity for the entire period of observation (1900–2022) is –10–10 year–1. The STDmaps show the diversity of deformation settings in the study area. Turkey is largely dominated by the horizontal shearmode (eastern and central parts). The extension mode manifests itself in the southwestern part. The western part ofTurkey and the southern part of the East Anatolian fault zone are characterized by transtension mode. The Lake Van areais characterized by transpression mode. The shortening axis direction changes from sublatitudinal in the west of Turkeyto submeridional in the east. STD tensors served as a base for plotting the distributions of the Lode – Nadai coefficient μεand the vertical component. Based on the seismic and GNSS data, a comparison was made between the shortening andelongation axes directions.
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SEISMICITY AND CRUSTAL SEISMOTECTONIC DEFORMATIONS OF THE ANATOLIAN PLATE (TURKEY)статья Исследовательская статья

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