Vestnik of the Far East Branch of the Russian Academy of SciencesVestnik of the Far East Branch of the Russian Academy of SciencesВестник Дальневосточного отделения Российской академии наук0869-7698The Russian Academy of Sciences67602610.31857/S0869769824020025ldwgvsEarth and Environment SciencesНауки о Земле и окружающей средеResearch ArticleSpatial heterogenity of slip on finite faults in the Kuril-Kamchatka Segment of the Pacific subduction zoneПространственные неоднородности вектора подвижки протяженных очагов землетрясений в районе Курило-Камчатского сегмента Тихоокеанской зоны субдукцииhttps://orcid.org/0000-0003-2997-1524KonovalovAlexey V.КоноваловАлексей Валерьевич
Russian Federation

Candidate of Sciences in Physics and Mathematics, Leading Researcher

кандидат физико-математических наук, ведущий научный сотрудник

a.konovalov@geophystech.ruVoronezhtsevaEvelina E.ВоронежцеваЭвелина Евгеньевна
Russian Federation

Student

студентка

evorone@mail.ruhttps://orcid.org/0000-0001-5263-5161StepnovaYulia A.СтепноваЮлия Андреевна
Russian Federation

Candidate of Sciences in Geology and Mineralogy, Senior Researcher

кандидат геолого-минералогических наук, старший научный сотрудник

stepnova@fegi.ruFar East Geological Institute, FEB RASДальневосточный геологический институт ДВО РАНSakhalin State UniversityСахалинский государственный университет150420242173228022025Copyright ©; 2024, Russian Academy of SciencesCopyright ©; 2024, Российская академия наук2024Russian Academy of SciencesРоссийская академия наукhttps://journals.eco-vector.com/0869-7698/article/view/676026

The study aims at gathering detailed information on source-related seismic radiation patterns in the interaction zone of Pacific and North American lithospheric plates (the Kuril-Kamchatka segment). To achieve our goals, we have developed a program capable of mapping zones of relatively high slip and assessing their area based on GIS data. We have analyzed the asperity distribution on a fault plane. A stochastic model of subduction-related interplate earthquakes has been proposed in the framework of fragmentary-based source model. The obtained results can further be used in a stochastic simulation of a catalogue of finite faults for the Japan-Kuril-Kamchatka island arc.

Исследование ориентировано на уточнение фрагментированной структуры очага землетрясения в области межплитового взаимодействия Тихоокеанской и Северо-Американской литосферных плит (Курило-Камчатский сегмент). Под фрагментированной структурой очага понимаются размеры, положение и количество неровностей на площадке разрыва. Неровности, отождествляемые с относительно повышенными значениями вектора подвижки, являются источником высокочастотного некогерентного излучения. Полученные результаты востребованы в практических задачах по моделированию акселерограмм в рамках «рецепта», предложенного японскими исследователями K. Irikura, H. Miyake. Для решения поставленных задач разработана программа, анализирующая геопространственные данные, приводимые сейсмологическими дата-центрами. Проанализированы неоднородности распределения вектора подвижки на плоскости разрыва. На основе обработанных данных и обзора параметров субдукционных землетрясений предложена фрагментированная модель очага в исследуемом районе. Случайный перебор в приемлемых диапазонах параметров модели позволит получить набор сценарных землетрясений. В настоящей статье обосновываются указанные диапазоны.

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