gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2024-15-3-0761MMZEWKgtcrust-1850Research ArticleСОВРЕМЕННАЯ ГЕОДИНАМИКАRECENT GEODYNAMICSИССЛЕДОВАНИЕ И МОДЕЛИРОВАНИЕ ПОСТСЕЙСМИЧЕСКИХ ДВИЖЕНИЙ ЗЕМНОЙ КОРЫ, ИНИЦИИРОВАННЫХ ГЛУБОКОФОКУСНЫМ ОХОТОМОРСКИМ ЗЕМЛЕТРЯСЕНИЕМ 24.05.2013 г., MW 8.3, ПО ДАННЫМ ГНСС-НАБЛЮДЕНИЙGNSS-Based Modeling and Study of Postseismic Crustal Movement of the May 24, 2013, MW 8.3 Sea of Okhotsk Deep-Focus EarthquakeШестаковН. В.ShestakovN. V.

690922, Владивосток, о. Русский, п. Аякс, 10; 690041, Владивосток, ул. Радио, 7

Nikolay V. Shestakov

10 Ajax Bay, Russky Island, Vladivostok, 690922; 7 Radio St, Vladivostok, 690041

shestakov.nv@dvfu.ruНечаевГ. В.NechaevG. V.

690922, Владивосток, о. Русский, п. Аякс, 10; 690041, Владивосток, ул. Радио, 7

10 Ajax Bay, Russky Island, Vladivostok, 690922; 7 Radio St, Vladivostok, 690041

ТитковН. Н.TitkovN. N.

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

9 Piip Blvd, Petropavlovsk-Kamchatsky 683006

ЧебровД. В.ChebrovD. V.

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

9 Piip Blvd, Petropavlovsk-Kamchatsky 683006

ПупатенкоВ. В.PupatenkoV. V.

680000, Хабаровск, ул. Ким Ю. Чена, 65

65 Kim Yu Chen St, Khabarovsk 680000

ПрытковА. С.PrytkovА. S.

693022, Южно-Сахалинск, ул. Науки, 1Б

1B Nauki St, Yuzhno-Sakhalinsk 693022

НагорныйК. А.NagornyK. A.

690922, Владивосток, о. Русский, п. Аякс, 10

10 Ajax Bay, Russky Island, Vladivostok, 690922

Дальневосточный федеральный университет; Институт прикладной математики ДВО РАНРоссияFar Eastern Federal University; Institute for Applied Mathematics, Far Eastern Branch of the Russian Academy of SciencesRussian FederationКамчатский филиал ФИЦ ЕГС РАНРоссияKamchatka Branch of the Federal Research Center of the Geophysical Survey, Russian Academy of SciencesRussian FederationИнститут тектоники и геофизики им. Ю.А. Косыгина ДВО РАНРоссияKosygin Institute of Tectonics and Geophysics, Far Eastern Branch of the Russian Academy of SciencesRussian FederationИнститут морской геологии и геофизики ДВО РАНРоссияInstitute of Marine Geology and Geophysics, Far Eastern Branch of the Russian Academy of SciencesRussian FederationДальневосточный федеральный университетРоссияFar Eastern Federal UniversityRussian Federation202418062024153761761Copyright © Шестаков Н.В., Нечаев Г.В., Титков Н.Н., Чебров Д.В., Пупатенко В.В., Прытков А.С., Нагорный К.А., 20242024Шестаков Н.В., Нечаев Г.В., Титков Н.Н., Чебров Д.В., Пупатенко В.В., Прытков А.С., Нагорный К.А.Shestakov N.V., Nechaev G.V., Titkov N.N., Chebrov D.V., Pupatenko V.V., Prytkov А.S., Nagorny K.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/1850

Механизмы подготовки, реализации и поверхностные проявления сильнейших глубокофокусных землетрясений с MW≥8 все еще остаются недостаточно изученными из-за отсутствия необходимого количества измерительной информации об этих процессах. На сегодняшний день инструментально зарегистрированы только три таких сейсмических события. В настоящей работе на основе данных многолетних непрерывных ГНСС-наблюдений, полученных на пунктах геодезических сетей, расположенных в Охотоморском регионе на п-ве Камчатка, о. Сахалин, побережье Охотского и Японского морей, выявлены и проанализированы изменения характеристик современных движений земной коры, инициированные Охотоморским глубокофокусным землетрясением 2013 г., MW 8.3. Обнаружены устойчивые во времени изменения скоростей среднегодовых движений геодезических пунктов. Авторами статьи не выявлено нелинейных изменений координат ГНСС-пунктов, характерных для сильных мелкофокусных землетрясений в начальный постсейсмический период. Моделирование процесса вязкоупругой релаксации астеносферы/верхней мантии в результате сейсмического воздействия с использованием реологии Максвелла позволяет в первом приближении качественно и количественно воспроизвести наблюдаемые в начальный постсейсмический период (2–3 года после главного толчка) смещения ГНСС-пунктов Камчатского п-ва. После этого модельные оценки постсейсмических движений полуострова становятся систематически преуменьшенными, по сравнению с наблюдаемыми перемещениями. Рассчитанные движения ГНСС-станции в п. Охотск (OKHT), расположенном на западном побережье Охотского моря, совпадают с ее наблюдаемыми постсейсмическими смещениями на всем интервале измерений. Направления векторов измеренных постсейсмических движений о. Сахалин систематически отклоняются к северо-востоку от модельных и направлены практически ортогонально Курило-Камчатскому желобу. Одной из возможных причин подобного эффекта, помимо процесса вязкоупругой релаксации, может быть усиление вязкого трения в нижней части погружающейся Тихоокеанской плиты, приводящее к усиленному деформированию о. Сахалин и западного побережья Камчатки.

The mechanisms of preparation and occurrence of the strongest deep-focus earthquakes with MW≥8, as well as their surface manifestations, remain insufficiently studied because of the lack of the relevant data. There are but three seismic events of this kind which have so far been instrumentally recorded. This paper describes the identification and analysis of the changes in the characteristics of modern crustal movement of the 2013, MW 8.3 Sea of Okhotsk deep-focus earthquake based on the data from long-term continuous geodetic-class GNSS stations in the Sea of Okhotsk region on the Kamchatka Peninsula, the Sakhalin Island, and the coast of the Sea of Okhotsk and the Sea of Japan. There has been found temporal stability of variations in the average annual geodetic site velocities. The coordinates of GNSS-stations do not show non-linear changes typical of strong shallow earthquakes in the initial post-seismic period. The Maxwell rheology for modeling of viscoelastic relaxation of the asthenosphere/upper mantle as a result of seismic impact allows for a first approximation to qualitatively and quantitatively reproduce the displacement patterns of GNSS-sites of the Kamchatka Peninsula observed in the initial postseismic period (2–3 years after the mainshock). After that, the model estimates of postseismic movements of the peninsula become systematically lower than the observed. The values calculated for the OKHT station motion on the western coast of the Sea of Okhotsk are in good agreement with those recorded for postseismic displacements over the entire measurement interval. The observed directions of the Sakhalin Island postseismic movements systematically deviate to the northeast from the model directions and are oriented almost orthogonally to the Kuril-Kamchatka Trench. Besides the viscoelastic relaxation process, another possible reason for this issue could be an enhanced viscous friction in the bottom of the subducting Pacific plate, leading to the intense deformation of the Sakhalin Island and the western coast of Kamchatka.

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