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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-2022-13-2s-0632</article-id><article-id custom-type="elpub" pub-id-type="custom">gtcrust-1397</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>ВАРИАЦИИ УРОВНЯ МИКРОСЕЙСМ ПЕРЕД ЗЕМЛЕТРЯСЕНИЯМИ В БАЙКАЛЬСКОЙ РИФТОВОЙ СИСТЕМЕ</article-title><trans-title-group xml:lang="en"><trans-title>AMBIENT SEISMIC NOISE VARIATIONS BEFORE EARTHQUAKES IN THE BAIKAL RIFT SYSTEM</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>Король</surname><given-names>С. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Korol</surname><given-names>S. 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><email xlink:type="simple">blinova@crust.irk.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Саньков</surname><given-names>А. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Sankov</surname><given-names>A. 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>Добрынина</surname><given-names>А. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Dobrynina</surname><given-names>A. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>664033, Иркутск, ул. Лермонтова, 128</p><p>670047, Улан-Удэ, ул. Сахьяновой, 6, Республика Бурятия</p></bio><bio xml:lang="en"><p>128 Lermontov St, Irkutsk 664033</p><p>Sakhyanova St, Ulan-Ude 670047, Republic of Buryatia</p></bio><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Саньков</surname><given-names>В. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Sankov</surname><given-names>V. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>664033, Иркутск, ул. Лермонтова, 128</p><p>664003, Иркутск, ул. Карла Маркса, 1</p></bio><bio xml:lang="en"><p>128 Lermontov St, Irkutsk 664033</p><p>3 Karl Marx St, Irkutsk 664011</p></bio><xref ref-type="aff" rid="aff-3"/></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><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Институт земной коры СО РАН; Геологический институт 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; Geological Institute, Siberian Branch of the Russian Academy of Sciences</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-3"><aff xml:lang="ru"><institution>Институт земной коры СО РАН; Иркутский государственный университет</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Institute of the Earth’s Crust, Siberian Branch of the Russian Academy of Sciences; Irkutsk State University</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2022</year></pub-date><pub-date pub-type="epub"><day>10</day><month>02</month><year>2022</year></pub-date><volume>13</volume><issue>2</issue><fpage>632</fpage><lpage>632</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Король С.А., Саньков А.В., Добрынина А.А., Саньков В.А., 2022</copyright-statement><copyright-year>2022</copyright-year><copyright-holder xml:lang="ru">Король С.А., Саньков А.В., Добрынина А.А., Саньков В.А.</copyright-holder><copyright-holder xml:lang="en">Korol S.A., Sankov A.V., Dobrynina A.A., Sankov V.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/1397">https://www.gt-crust.ru/jour/article/view/1397</self-uri><abstract><p>В работе показана методика обнаружения признаков подготовки землетрясений по данным о вариациях микросейсмического шума на примере близких умеренных и сильных сейсмических событий. Для восьми землетрясений Байкальской рифтовой системы с энергетическим классом К=10.1–15.9 на эпицентральных расстояниях от 3 до 81 км установлено значимое понижение уровня микросейсмического шума за несколько часов перед толчком. Зафиксированное понижение уровня может классифицироваться как краткосрочный предвестник, связанный с консолидацией среды за 4–5 часов до землетрясения.</p></abstract><trans-abstract xml:lang="en"><p>This paper proposes a method to observe the pre-earthquake features based on the variations in ambient noises using local moderate and strong seismic events as an example. Eight earthquakes in the Baikal rift system with energy classes K=10.1–15.9 were associated to a significant decrease in the level of ambient noises at epicentral distances from 3 to 81 km a few hours before the shock. The observed decrease in the ambient noise level can be classified as a short-term precursor of the medium consolidation 4–5 hours before the earthquake.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>предвестники землетрясений</kwd><kwd>микросейсмы</kwd><kwd>Байкальская рифтовая система</kwd><kwd>спектрально-временной анализ</kwd></kwd-group><kwd-group xml:lang="en"><kwd>earthquake’s precursors</kwd><kwd>ambient seismic noise</kwd><kwd>Baikal rift system</kwd><kwd>time-frequency analysis</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Работы С.А. Король и А.В. Санькова проводились в рамках проекта Минобрнауки РФ № 075-15-2020-787 «Фундаментальные основы, методы и технологии цифрового мониторинга и прогнозирования экологической обстановки Байкальской природной территории». Работы А.А. Добрыниной и В.А. Санькова поддержаны Российским фондом фундаментальных исследований, проект № 21-55-53019_ГФЕН-а. Авторы благодарны заместителю директора БФ ФИЦ ЕГС РАН, к.г.-м.н. В.В. Чечельницкому и анонимному рецензенту за конструктивные замечания, позволившие улучшить качество статьи.</funding-statement><funding-statement xml:lang="en">The works of S.A. Korol and A.V. Sankov were done as a part of the project of the Ministry of Science and Higher Education of the Russian Federation 075-15-2020-787 "Basic grounds, methods and technologies of digital monitoring and ecological forecasting for the Baikal Natural Territory". The works of A.A. Dobrynina and V.A. Sankov were supported by the Russian Fund of Basic Researches (project 21-55-53019_ NSFC-a).</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">Черных Е.Н., Табулевич В.Н. 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