gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2025-16-4-0836WJZGSHgtcrust-2073Research ArticleСОВРЕМЕННАЯ ГЕОДИНАМИКАRECENT GEODYNAMICSНЕКОТОРЫЕ ОСОБЕННОСТИ СЕЙСМИЧЕСКОГО РЕЖИМА КАМЧАТСКОГО РЕГИОНА. АКТИВИЗАЦИЯ СЕЙСМИЧНОСТИ В 2000–2021 ГОДАХSOME FEATURES OF SEISMIC REGIME IN THE KAMCHATKA REGION: SEISMIC ACTIVATION IN 2000–2021https://orcid.org/0009-0005-5992-9724ШевченкоЮ. В.ShevchenkoYu. V.

683006, Петропавловск-Камчатский, б-р Пийпа, 9

9 Piip Blvd, Petropavlovsk-Kamchatsky 683006 

klb@emsd.ruКамчатский филиал ФИЦ ЕГС РАНРоссияKamchatka Branch of the Federal Research Center of the Geophysical Survey, Russian Academy of SciencesRussian Federation202516082025164836836Copyright © Шевченко Ю.В., 20252025Шевченко Ю.В.Shevchenko Y.V.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/2073

Основным объектом исследования в данной работе является сейсмичность Камчатского региона. На основе инструментальных наблюдений за 60 лет выделено семь слоев в соответствии с распределением сейсмической энергии по глубине. Для каждого слоя получены характеристики сейсмичности: количество событий в слое, глубина пиковых значений энергии, суммарная энергия в слое, наклон линии тренда графиков повторяемости, отношение суммарной энергии землетрясений выше 14-го класса к суммарной энергии землетрясений от 10 до 14-го класса. Почти половина всей сейсмической энергии региона пришлась на глубину более 550 км. Наклон линии тренда графиков повторяемости с глубиной уменьшается от 0.63 до 0.36.

Изменение сейсмичности в слоях за время инструментальных наблюдений показано на графиках отклонений от равномерного со временем роста накопленной кумулятивной энергии и кумулятивной суммы количества событий. Ход графиков позволяет принять допущение о постоянстве скорости субдукции и стабильности фоновой диссипации сейсмической энергии для Камчатского региона на интервалах с линейным во времени ростом накопленной кумулятивной энергии.

Увеличение скорости накопления кумулятивной суммы количества землетрясений на глубине более 550 км впоследствии сопровождалось возрастанием скорости накопления кумулятивной суммы количества событий в слоях 0–35 и 80–130 км. Показано, что с начала 2000-х гг. на участке сейсмофокальной зоны Камчатского региона отмечается повышение сейсмической активности.

This paper mainly considers seismicity in the Kamchatka region. Based on 60-year-long instrumental observations, there were seven seismic layers identified according to depth distribution of seismic energy. For each layer, there were obtained seismicity characteristics: a number of events in a layer, depth of peak energy penetration, total energy in a layer, slope of a trend line in recurrence plots, ratio of the total energy of earthquakes with a K-value greater than 14 to that of earthquakes with a K-value between 10 and 14. The slope of the trend line in recurrence plots decreases with depth from 0.63 to 0.36. Almost half of the total seismic energy fell within the depth greater than 50 km.

The change in seismic layers during the instrumental observations is shown on plots of deviations from uniform increase in the accumulation of cumulative energy over time and cumulative total amount of events. The movement on the plots allows making an assumption about the constancy of subduction velocity and stability of background seismic energy dissipation for the Kamchatka region on the intervals with a linear increase in the accumulation of cumulative energy over time.

An increase in the accumulation rate of the cumulative total amount of earthquakes at depths greater than 550 km was subsequently followed by an increase in the accumulation rate of the cumulative total amount of events in 0–35 and 80–130 km layers. It is shown that since the 2000s there has been an increase in seismic activity in seismic focal zone of the Kamchatka region.

Камчатский регионземлетрясениепараметры сейсмичности за 60 летKamchatka regionearthquakeseismic parameters over a 60-year periodИсследование проведено при поддержке Минобрнауки РФ в рамках госзадания № 075-00604-25 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 on the state assignment No. 075-00604-25 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".ReferencesAbe K., Kanamori H., 1980. Magnitudes of Great Shallow Earthquakes from 1953 to 1977. Tectonophysics 62 (3–4), 191–203. https://doi.org/10.1016/0040-1951(80)90192-4.Abe K., Kanamori H., 1980. 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The authors declare that there are no conflicts of interest present.