Abstract
The calculation of seismotectonic deformations for different depth levels 1–15, 16–35, 36–70 km was performed according to the data of 1819 mechanisms of earthquake foci that occurred in Central Asia (φ = 25° – 60° N, λ=60° – 115° E) for the period from 1976 to the end of July 2020 with M>4.7. The orientation of the main axes of the strain tensor reconstructed from the mechanisms of earthquake foci with M>4.7 coincide at different depth levels with mainly submeridional and north-eastern shortening and varying elongation from sublatitude to north-western and near-vertical. The consistency of the orientation of the main axes of shortening and elongation reconstructed from seismological materials and from the published results of calculating GPS observations, is traced.
Highlights
The calculation of seismotectonic deformations for different depth levels 1–15, 16–35, 36–70 km was performed according to the data of 1819 mechanisms of earthquake foci that occurred in Central Asia (φ = 25° – 60° N, λ=60° – 115° E) for the period from 1976 to the end of July 2020 with M>4.7
The orientation of the main axes of the strain tensor reconstructed from the mechanisms of earthquake foci with M>4.7 coincide at different depth levels with mainly submeridional and northeastern shortening and varying elongation from sublatitude to north-western and near-vertical
Статья поступила в редакцию 19 августа 2021 г., принята к публикации 22 сентября 2021 г
Summary
Выполнен расчет сейсмотектонических деформаций для разных глубинных уровней 1–15, 16–35 и 36–70 км по данным 1819 механизмов очагов землетрясений, произошедших в Центральной Азии (φ = 25° – 60° с.ш., λ=60° – 115°в.д.) за период с 1976 г. Ориентация главных осей тензора деформаций, восстановленная по механизмам очагов землетрясений с М>4.7, совпадает на разных глубинных уровнях при преимущественно субмеридиональном и северо-восточном укорочении и меняющемся удлинении от субширотного до северо-западного и близвертикального. The orientation of the main axes of the strain tensor reconstructed from the mechanisms of earthquake foci with M>4.7 coincide at different depth levels with mainly submeridional and northeastern shortening and varying elongation from sublatitude to north-western and near-vertical. В данной статье поля деформаций, рассчитанные по механизмам очагов землетрясений внутриплитных зон, рассмотрим для разных глубинных слоев и сопоставим с приповерхностными деформациями, вычисленными по данным GPS. Ранее для рассматриваемой территории такие сопоставления проводились для отдельных геодинамических зон [Gan et al, 2007; Liu et al, 2007; Зубович, Мухамедиев, 2010; Саньков, 2014; Сычева, Мансуров, 2020]
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