gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2025-16-3-0831folqdjgtcrust-2045Research ArticleСОВРЕМЕННАЯ ГЕОДИНАМИКАRECENT GEODYNAMICSСТРУКТУРА ЗЕМНОЙ КОРЫ И ВЕРХОВ МАНТИИ ВОСТОЧНОЙ ЧАСТИ ПОЛУОСТРОВА КАМЧАТКА ПО ДАННЫМ ПРИЕМНЫХ ФУНКЦИЙ ПРОДОЛЬНЫХ ВОЛНCRUSTAL AND UPPER MANTLE STRUCTURE IN THE EASTERN PART OF THE KAMCHATKA PENINSULA FROM P-WAVE RECEIVER FUNCTIONSХритоваМ. А.KhritovaM. A.

664033, Иркутск, ул. Лермонтова, 128

 

Maria A. Khritova

128 Lermontov St, Irkutsk 664033

hritova@crust.irk.ruМордвиноваВ. В.MordvinovaV. V.

664033, Иркутск, ул. Лермонтова, 128

128 Lermontov St, Irkutsk 664033

КобелеваЕ. А.KobelevaE. A.

664033, Иркутск, ул. Лермонтова, 128

 

128 Lermontov St, Irkutsk 664033

Байкальский филиал ФИЦ ЕГС РАН; Институт земной коры СО РАНРоссияBaikal Branch of the Federal Research Center of the Geophysical Survey, Russian Academy of Sciences; Institute of the Earth’s Crust, Siberian Branch of the Russian Academy of SciencesRussian FederationИнститут земной коры СО РАНРоссияInstitute of the Earth’s Crust, Siberian Branch of the Russian Academy of SciencesRussian Federation202518062025163831831Copyright © Хритова М.А., Мордвинова В.В., Кобелева Е.А., 20252025Хритова М.А., Мордвинова В.В., Кобелева Е.А.Khritova M.A., Mordvinova V.V., Kobeleva E.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/2045

Работа посвящена изучению глубинного строения земной коры и верхов мантии восточной части п-ва Камчатка. Построены одномерные разрезы зависимости сейсмической скорости поперечной волны VS от глубины h, полученные в результате инверсии продольных приемных функций, выделенных по записям далеких землетрясений 11 сейсмических станций Камчатского филиала ФИЦ ЕГС РАН за 2011–2016 гг. В исследовании представлена двухмерная VS-модель до глубины 70 км для профиля вдоль Восточно-Камчатского вулканического пояса протяженностью 950 км.

По построенному разрезу обнаруживается слоистая структура коры и ~40 км подкоровой мантии. Выявленную структуру приближенно можно назвать слоисто-блоковой. В пределах земной коры выделяются структурные слои: контрастная граница на глубине 5–7 км со скачком скорости поперечных волн от 2.8 до 3.2 км/с; однородный слой на глубине 10–25 км, в котором скорость VS плавно возрастает от 3.5 до 3.7 км/с; переходная коромантийная зона на глубине 28–36 км с VS=3.8–3.9 км/c. Верхние слои мантии выявляются как низкоскоростные (VS=4 км/c) относительно глобальной модели IASP91. В районе Авачинской бухты на скоростном разрезе наблюдается сложное строение коры, на глубинах до 25 км обнаруживаются скоростные аномалии, что, скорее всего, является отражением Петропавловск-Малкинской зоны поперечных дислокаций, являющейся условной границей между структурами Южной и Центральной Камчатки.

The paper deals with the study of the deep structure of the Earth’s crust and upper mantle in the eastern part of the Kamchatka Peninsula. One-dimensional sections have been constructed to illustrate the relationship between shear wave velocity VS and depth h, obtained by inversion of longitudinal receiver functions, computed from seismograms of distant earthquakes recorded at 11 seismic stations of the KB FRC GS RAS for the period 2011–2016. The study presents a two-dimensional VS-model to a depth of 70 km for a profile along the 950-km East Kamchatka volcanic belt.

The constructed sections reveal a layered structure of the crust and ~40 km of the subcrustal mantle, which can roughly be described as a layered-block structure. The following structural layers are distinguished within the Earth’s crust: contrasting boundary at a depth of 5–7 km with a 2.8 to 3.2 km/s leap in transverse wave velocity; homogeneous layer at a depth of 10–25 km with a smooth VS increase from 3.5 to 3.7 km/s; transitional crust-mantle zone at a depth of 28–36 km with VS=3.8–3.9 km/s. The upper mantle layers are referred to as low velocity layers (VS=4 km/s) relative to IASP91 global model. The velocity profile from the Avacha Bay area reveals a complex crustal structure; velocity anomalies found at depths of up to 25 km are most likely a reflection of the Petropavlovsk-Malki zone of transverse dislocations, which is the conditional boundary between the structures of Southern and Central Kamchatka.

сейсмологияметод приемных функцийглубинное строениескоростные моделиполуостров Камчаткаseismologyreceiver functionsdeep structurevelocity modelsKamchatka PeninsulaАвторы выражают признательность Д.В. Чеброву за предоставленные данные сейсмических станций сети Камчатского филиала ФИЦ ЕГС РАН. Исследование проведено при поддержке Минобрнауки РФ в рамках госзадания № 075-00682-24 с использованием данных, полученных на УНУ «Сейсмоинфразвуковой комплекс мониторинга арктической криолитозоны и комплекс непрерывного сейсмического мониторинга Российской Федерации, сопредельных территорий и мира».The study was supported by the Ministry of Science and Higher Education of the Russian Federation as part of state assignment No. 075-00682-24, using the data obtained with LSRF "Seismic infrasound array for monitoring Arctic cryolitozone and continuous seismic monitoring of the Russian Federation, neighbouring territories and the world".ReferencesAmmon C.J., Randall G.E., Zandt G., 1990. 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The authors declare that there are no conflicts of interest present.