References

gtcrust

Геодинамика и тектонофизика

Geodynamics & Tectonophysics

2078-502X

Institute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch

10.5800/GT-2024-15-1-0743

YJRTTA

gtcrust-1795

Research Article

ТЕКТОНОФИЗИКА

TECTONOPHYSICS

СЕЙСМИЧНОСТЬ И СЕЙСМОТЕКТОНИЧЕСКИЕ ДЕФОРМАЦИИ ЗЕМНОЙ КОРЫ АНАТОЛИЙСКОЙ ПЛИТЫ (ТУРЦИЯ)

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

https://orcid.org/0000-0003-0386-3752

Сычева

Н. А.

Sycheva

N. А.

123242, Москва, ул. Большая Грузинская, 10, стр. 1

10-1 Bolshaya Gruzinskaya St, Moscow 123242

Институт физики Земли им. О.Ю. Шмидта РАНРоссияSchmidt Institute of Physics of the Earth, Russian Academy of SciencesRussian Federation

2024

16022024

151743743

2024

Сычева Н.А.

Sycheva N.А.

Данная работа распространяется под лицензией Creative Commons Attribution 4.0.

This work is licensed under a Creative Commons Attribution 4.0 License.

https://www.gt-crust.ru/jour/article/view/1795

В работе исследована сейсмичность и напряженно-деформированное состояние земной коры Турции, тектоника которой обусловлена относительными движениями Африканской, Эгейской, Аравийской, Анатолийской, Черноморской и Евразийской плит. Расчет сейсмотектонических деформаций (СТД) выполнен на основе подходов, предложенных в работах Ю.В. Ризниченко и С.Л. Юнги. Построение графиков распределения сейсмичности, среднегодовой скорости СТД (интенсивность СТД), параметра концентрации сейсмогенных разрывов и параметра Тсаллиса выполнено на основе анализа данных каталога землетрясений (более 300000 событий, 1900–2022 гг.). Представительная часть включает в себя события с М≥2.5. Распределение указанных параметров рассчитано для слоя 0–40 км, где локализована основная часть землетрясений. Глубокофокусные землетрясения происходят до глубины 170 км. Максимальное число землетрясений в год зарегистрировано в провинции Баликесир (более 90). Анализ сейсмичности и интенсивности СТД выполнен по двум временным периодам – 1997–2009 гг. и 2010–2022 гг. для западной и восточной части Турции, а также области разрушительных землетрясений 6 февраля 2023 г. Количество землетрясений, регистрируемых в западной части (75 %) Турции, значительно превышает количество землетрясений в восточной (25 %). В период 2010–2022 гг. увеличилось количество землетрясений в восточной части Турции по отношению к периоду 1997–2009 гг. и составило 38 % от общего числа событий. Исследования направленности СТД основаны на данных о фокальных механизмах очагов (807 событий, 1976–2023 гг.). Интенсивность СТД в области землетрясений 6 февраля 2023 г. с учетом этих землетрясений составляет 1.34⋅10–6 год–1, а фоновая интенсивность за весь период наблюдений (1900–2022 гг.) имеет порядок 10–10 год–1. По картам СТД отмечено разнообразие деформационных обстановок на территории исследования. На территории Турции преобладает режим горизонтального сдвига (восточная и центральная часть). Режим растяжения проявляется в юго-западной части. Для западной части Турции и южной части ВАРЗ (Восточная Анатолийская зона разломов) характерен режим транстенсии. Область расположения оз. Ван характеризуется режимом транспрессии. Направление осей укорочения меняется от субширотного на западе Турции до субмеридионального на востоке. На основе тензоров СТД построены графики распределения коэффициента Лоде – Надаи με, вертикальной компоненты. Проведено сравнение направлений осей укорочения и удлинения на основе сейсмических данных и данных Глобальной навигационной спутниковой системы.

The paper deals with the study of seismicity and the crustal stress-strain state of Turkey whose tectonics is caused by relative movements of the African, Aegean, Arabian, Anatolian, Black Sea and Eurasian plates. Seismotectonic deformations (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 Tsallis parameter 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 for a 0–40 km layer wherein most of the earthquakes are located. Deep-focus earthquakes occur at a depth to 170 km. The maximum 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 for the 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 the number of earthquakes in the eastern part of Turkey relative to the period 1997–2009, which made up 38 % of the total number of earthquakes. The studies of STD direction are based on the earthquake focal mechanism data (807 events for 1976–2023). STD intensity in the February 6, 2023 earthquake area, with regard to the February 6, 2023 earthquakes, is 1.34⋅10–6 year–1, and the background intensity for the entire period of observation (1900–2022) is –10–10 year–1. The STD maps show the diversity of deformation settings in the study area. Turkey is largely dominated by the horizontal shear mode (eastern and central parts). The extension mode manifests itself in the southwestern part. The western part of Turkey and the southern part of the East Anatolian fault zone are characterized by transtension mode. The Lake Van area is characterized by transpression mode. The shortening axis direction changes from sublatitudinal in the west of Turkey to submeridional in the east. STD tensors served as a base for plotting the distributions of the Lode – Nadai coefficient με and the vertical component. Based on the seismic and GNSS data, a comparison was made between the shortening and elongation axes directions.

землетрясениефокальный механизмоси удлинения и укорочения деформациирежимы СТДинтенсивность СТДЛоде – НадаиТурцияАнатолийская плита

earthquakefocal mechanismshortening and elongation axesSTD modesSTD intensityLode – Nadai coefficientTurkeythe Anatolian plate

Работа проведена в рамках государственного задания ИФЗ РАН.

The work was performed as part of the state assignment of the Institute of Physics of the Earth of the Russian Academy of Sciences.

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The authors declare that there are no conflicts of interest present.