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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">gtcrust</journal-id><journal-title-group><journal-title xml:lang="ru">Геодинамика и тектонофизика</journal-title><trans-title-group xml:lang="en"><trans-title>Geodynamics &amp; Tectonophysics</trans-title></trans-title-group></journal-title-group><issn pub-type="epub">2078-502X</issn><publisher><publisher-name>Institute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.5800/GT-2024-15-6-0793</article-id><article-id custom-type="edn" pub-id-type="custom">XALEEB</article-id><article-id custom-type="elpub" pub-id-type="custom">gtcrust-1948</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>СОВРЕМЕННАЯ ГЕОДИНАМИКА</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>RECENT GEODYNAMICS</subject></subj-group></article-categories><title-group><article-title>ВЫЯВЛЕНИЕ ОСОБЕННОСТЕЙ ВЛИЯНИЯ СКОРОСТНЫХ НЕОДНОРОДНОСТЕЙ ГРУНТОВЫХ СЛОЕВ НА СЕЙСМИЧЕСКИЕ ВОЗДЕЙСТВИЯ СИЛЬНЫХ ЗЕМЛЕТРЯСЕНИЙ БАЙКАЛО-МОНГОЛЬСКОГО РЕГИОНА</article-title><trans-title-group xml:lang="en"><trans-title>IDENTIFICATION OF THE FEATURES OF THE INFLUENCE OF HETEROGENEOUS-VELOCITY GROUND LAYERS ON LARGE-EARTHQUAKE EFFECTS IN THE MONGOLIAN-SIBERIAN REGION</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Джурик</surname><given-names>В. И.</given-names></name><name name-style="western" xml:lang="en"><surname>Dzhurik</surname><given-names>V. I.</given-names></name></name-alternatives><bio xml:lang="ru"><p>664033, Иркутск, ул. Лермонтова, 128</p></bio><bio xml:lang="en"><p>128 Lermontov St, Irkutsk 664033</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Брыжак</surname><given-names>Е. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Bryzhak</surname><given-names>E. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>664033, Иркутск, ул. Лермонтова, 128</p></bio><bio xml:lang="en"><p>128 Lermontov St, Irkutsk 664033</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Серебренников</surname><given-names>С. П.</given-names></name><name name-style="western" xml:lang="en"><surname>Serebrennikov</surname><given-names>S. P.</given-names></name></name-alternatives><bio xml:lang="ru"><p>664033, Иркутск, ул. Лермонтова, 128</p></bio><bio xml:lang="en"><p>128 Lermontov St, Irkutsk 664033</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Какоурова</surname><given-names>А. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Kakourova</surname><given-names>A. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>664033, Иркутск, ул. Лермонтова, 128</p></bio><bio xml:lang="en"><p>128 Lermontov St, Irkutsk 664033</p></bio><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Институт земной коры СО РАН</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Institute of the Earth’s Crust, Siberian Branch of the Russian Academy of Sciences</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2024</year></pub-date><pub-date pub-type="epub"><day>13</day><month>12</month><year>2024</year></pub-date><volume>15</volume><issue>6</issue><fpage>793</fpage><lpage>793</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Джурик В.И., Брыжак Е.В., Серебренников С.П., Какоурова А.А., 2024</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="ru">Джурик В.И., Брыжак Е.В., Серебренников С.П., Какоурова А.А.</copyright-holder><copyright-holder xml:lang="en">Dzhurik V.I., Bryzhak E.V., Serebrennikov S.P., Kakourova A.A.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://www.gt-crust.ru/jour/article/view/1948">https://www.gt-crust.ru/jour/article/view/1948</self-uri><abstract><p>Для территорий южной части Восточной Сибири и Северной Монголии дана количественная оценка влияния скоростных неоднородностей грунтовых слоев верхней части земной коры на единый обоснованный исходный сигнал. В сейсмическом отношении территория оценивается в 7–9 баллов, в геоморфологическом – представляется как система межгорных понижений и горных сооружений, в геологическом плане район входит в систему Байкальской рифтовой зоны как ее юго-западный и южный фрагмент.</p><p>Работа направлена на развитие методов изучения и прогноза сейсмических воздействий сильных землетрясений Байкало-Монгольского региона. Последовательность реализации поставленной задачи связана с необходимостью задания расчетных акселерограмм, построения сейсмогрунтовых моделей и проведения теоретических расчетов для исследуемого региона. При использовании относительно сильных землетрясений, зарегистрированных в 2020–2022 гг. одновременно в г. Иркутске и г. Улан-Баторе, для грунтов первой категории сформирован единый исходный сигнал с учетом вероятных очаговых зон для прогнозируемых близких и относительно далеких сильных землетрясений региона. Для построения расчетных сейсмогрунтовых моделей использованы результаты сейсморазведочных и сейсмометрических измерений, выполненных в последнее время, а также данные, полученные ранее другими исследователями. Учитывались и имеющиеся обобщенные сведения об изменении скоростей сейсмических волн с глубиной для наиболее распространенных типов рыхлых неводонасыщенных грунтов до первых сотен метров и коренных пород до возможной глубины возникновения землетрясений. Построенные модели характеризуются мощностью слоев, изменением скоростей продольных и поперечных волн с глубиной, объемной массой и декрементом затухания.</p><p>Результаты теоретических расчетов особенностей влияния скоростных неоднородностей грунтовых слоев на амплитудный и частотный состав сформированных исходных сигналов представлены в параметрах основных показателей сейсмических воздействий (максимальные ускорения, преобладающие частоты колебаний и соответствующий им амплитудный уровень, резонансные частоты и сопутствующие значения усиления колебаний) для построенных вероятных сейсмических моделей по расчетным акселерограммам, спектрам и частотным характеристикам.</p></abstract><trans-abstract xml:lang="en"><p>The southern part of Eastern Siberia and the northern part of Mongolia were quantitatively assessed in terms of the influence of the upper-crustal heterogeneous-velocity ground layers on a single reasonable initial signal. Seismically, the territory is estimated at 7–9 intensity units; geomorphologically, it appears as a system of intermountain depressions and mountain structures; geologically, the area is a part of the Baikal rift zone system as its southwestern and southern fragments are incorporated therein.</p><p>The work is aimed at developing methods for studying and predicting seismic effects of large earthquakes in the Mongolian-Baikal region. The implementation of the task is associated with the need of assigning calculated accelerograms, modeling seismic ground motion, and carrying out theoretical calculations for the region under study. Using the data from 2020-2022 relatively large earthquakes recorded simultaneously in Irkutsk and Ulaanbaatar, I category grounds were assigned a single initial signal with regard to potential source zones of near and distant large earthquakes in the region. Computational models of seismic ground motions were developed based on recently obtained seismic survey and seismometric measurement data. The authors also took into account the available general dataset on the change in seismic wave velocities with depth for the most common types of loose unsaturated grounds to a few hundred meters and for the bedrock to the probable depth of earthquake occurrence. The constructed models are characterized by layer thickness, change in longitudinal and transverse wave velocities with depth, volumetric mass, and attenuation decrement.</p><p>The results of theoretical calculations for the features of the influence of heterogenous-velocity ground layers on the amplitude and frequency composition of the assigned initial signals are presented as the parameters of seismic effects (maximum accelerations, predominant ground motions frequencies and their corresponding amplitude level, resonant frequencies and accompanying ground motions amplification values) for seismic probability models developed based on the calculated accelerograms, spectra, and frequency characteristics.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>сейсмические воздействия</kwd><kwd>сейсмогрунтовые модели</kwd><kwd>акселерограммы</kwd><kwd>исходный сигнал</kwd><kwd>максимальные ускорения</kwd><kwd>спектры</kwd><kwd>частотные характеристики</kwd></kwd-group><kwd-group xml:lang="en"><kwd>seismic effects</kwd><kwd>seismic ground motion modeling</kwd><kwd>initial signal</kwd><kwd>maximum accelerations</kwd><kwd>spectra</kwd><kwd>frequency characteristics</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Исследование выполнено при поддержке РФФИ и МОКНСМ в рамках научного проекта №20-55-44011. В работе задействовалось оборудование ЦКП «Геодинамика и геохронология» ИЗК СО РАН по гранту 075-15-2021-682</funding-statement><funding-statement xml:lang="en">This research was carried out with support from the Russian Foundation for Basic Research and the Ministry of Education, Culture, Science and Sports of Mongolia as part of scientific project № 20-55-44011. This work was conducted using equipment and infrastructure of the Centre for Geodynamics and Geochronology at the Institute of the Earth’s Crust SB RUS (grant no 075-15-2021-682)</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Алешин А.С. Фундаментальные аспекты сейсмического микрорайонирования // Сейсмостойкое строительство. Безопасность сооружений. 2017. № 4. С. 8–17.</mixed-citation><mixed-citation xml:lang="en">Aleshin А.S., 2017. Fundamental Aspects of Seismic Microzonation. 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