gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2018-9-2-0354gtcrust-584Research ArticleСОВРЕМЕННАЯ ГЕОДИНАМИКАRECENT GEODYNAMICSАНИЗОТРОПНЫЕ СВОЙСТВА ВЕРХНЕЙ МАНТИИ ЦЕНТРАЛЬНОЙ АЗИИ ПО ДАННЫМ ДИСПЕРСИИ ГРУППОВЫХ СКОРОСТЕЙ ВОЛН РЭЛЕЯ И ЛЯВАANISOTROPIC PROPERTIES OF THE UPPER MANTLE IN CENTRAL ASIA ACCORDING TO THE GROUP VELOCITY DISPERSION CURVES FOR RAYLEIGH AND LOVE WAVESСередкинаА. И.SeredkinaA. I.

канд. физ.-мат. наук, с.н.с.,

664033, Иркутск, ул. Лермонтова, 128

Candidate of Physics and Mathematics, Senior Researcher,

128 Lermontov street, Irkutsk 664033

ale@crust.irk.ruСоловейО. А.SoloveyO. A.

канд. геол.-мин. наук, н.с.,

664033, Иркутск, ул. Лермонтова, 128

Candidate of Geology and Mineralogy, Researcher,

128 Lermontov street, Irkutsk 664033

Solovey@crust.irk.ruИнститут земной коры СО РАНРоссияInstitute of the Earth’s Crust, Siberian Branch of RASRussian Federation20180307201892427437Copyright © Середкина А.И., Соловей О.А., 20182018Середкина А.И., Соловей О.А.Seredkina A.I., Solovey O.A.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/584

В работе представлены результаты исследования анизотропных свойств верхней мантии Цен‐ тральной Азии, выполненного на основании представительной выборки дисперсионных кривых групповых скоростей основной моды волн Рэлея и Лява. Дисперсионные кривые рассчитывались в диапазоне периодов 10–250 с. Карты распределений групповых скоростей с оценками горизонтального разрешения вычислялись методом поверхностно‐волновой томографии для сферической поверхности. По результатам картирования в заданных с учетом разрешения точках области исследования восстанавливались локальные дисперсионные кривые групповых скоростей и проводилась их инверсия в одномерные скоростные разрезы волн SV и SH и оценивался коэффициент вертикальной анизотропии. Таким образом, была получена трехмерная анизо‐ тропная модель распределения скоростей волн S в коре и мантии до глубины 500 км. Показано, что верти‐ кальная анизотропия в верхней мантии наблюдается до глубины около 250 км, с максимумом в интервале глубин от подошвы коры до 150 км. Распределение анизотропных свойств является неоднородным и отра‐ жает геологическое строение исследуемой области. Так, тектонически активные регионы характеризуются высокими значениями коэффициента анизотропии и пониженными значениями скоростей S‐волн. Получен‐ ные результаты в дальнейшем могут способствовать построению более детальных и обоснованных геодина‐ мических моделей рассматриваемой территории.

The article presents the results of the study focused on the anisotropic properties of the upper mantle in Central Asia. The study is based on a representative set of the group velocity dispersion curves for Rayleigh and Love waves. The dispersion curves were calculated in the range of 10–250 s. The maps of group velocity distribution pat‐ terns and the horizontal resolution estimates were calculated by the surface‐wave tomography method developed for a spherical surface. Based on the maps, the local group velocity dispersion curves were reconstructed for the given points within the study region, which were then converted into the one‐dimensional velocity sections of SV‐ and SH‐waves, and a vertical anisotropy coefficient was estimated. A three‐dimensional anisotropic model shows the ve‐ locity distribution pattern of S‐waves in the crust and the mantle to the depth of 500 km. According to this model, ver‐ tical anisotropy in the upper mantle is observed to the depth of about 250 km and has maximum values in the depth interval from the crustal bottom to 150 km. The anisotropic properties are unevenly distributed and reflect the geo‐ logical structure of the study area. Therefore, tectonically active regions are characterized by the high values of the anisotropy coefficient and the reduced values of the S‐wave velocities. The presented results can contribute to the further development of more detailed and strictly proved geodynamic models of the study area.

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