gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2025-16-4-0839HITSKSgtcrust-2076Research ArticleСОВРЕМЕННАЯ ГЕОДИНАМИКАRECENT GEODYNAMICSРАСПРЕДЕЛЕНИЕ КОСЕЙСМИЧЕСКОГО СМЕЩЕНИЯ ПРИ ЗЕМЛЕТРЯСЕНИИ МАГНИТУДОЙ MW 6.8 В БЕНКУЛУ В 2020 Г. ПО ДАННЫМ ГНСС НАБЛЮДЕНИЙCOSEISMIC SLIP DISTRIBUTION OF THE 2020 Mw 6.8 BENGKULU EARTHQUAKE DERIVED FROM THE GNSS OBSERVATIONSАнггараО.AnggaraO.

35365, Южный Лампунг

South Lampung 35365

ongky.anggara@gt.itera.ac.idМейланоИ.MeilanoI.

40132, Бандунг

Bandung 40132

АлифС. М.AlifS.M.

35365, Южный Лампунг

South Lampung 35365

СусилоС.SusiloS.

Богор

Bogor

Суматринский технологический институтИндонезияSumatra Institute of TechnologyIndonesiaБандунгский технологический институтИндонезияInstitute of Technology BandungIndonesiaНациональное агентство исследований и инновацийИндонезияNational Research and Innovation AgencyIndonesia202516082025164839839Copyright © Анггара О., Мейлано И., Алиф С., Сусило С., 20252025Анггара О., Мейлано И., Алиф С., Сусило С.Anggara O., Meilano I., Alif S., Susilo S.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/2076

18 августа 2020 г. примерно в 130 км к юго-западу от Бенкулу произошло землетрясение магнитудой 6.8. В статье использованы статические ГНСС-данные с расположенных вокруг эпицентра землетрясения станций непрерывного мониторинга для получения записей в течение 10 дней до и 10 дней после землетрясения. Оценка распределения косейсмического смещения проведена при помощи двух моделей нодальных плоскостей в решении USGS. Расчет косейсмического смещения был проведен с использованием упругой полупространственной модели с оптимальным инверсионным смещением. ГНСС-данные смещений, составляющих менее ~5 мм, указывают на их незначительность и оптимальную модель с параметрами простирания 313° и падения 8° при несоответствии ~0.4 мм. В настоящем исследовании предполагается, что землетрясение 2020 г. в Бенкулу произошло в результате субдукции Индо-Австралийской плиты под Евразийскую плиту с кумулятивным сейсмическим моментом 1.73·1019 Н·м, эквивалентным магнитуде 6.76.

On August 18, 2020, an MW 6.8 earthquake occurred ~130 km southwest of Bengkulu. In this study, we used the static GNSS data from continuously monitoring stations, surrounding the epicentre, to obtain the data from 10 days before to 10 days after the earthquake. We estimate the coseismic slip distribution with two models of nodal planes from the USGS. The coseismic slip was calculated using an elastic half-space model with inversion best-fit displacement. The GNSS displacement data with values less than ~5 mm indicate an insignificant displacement and the best model arameters of strike of 313° and dip of 8°, with a misfit value of ~0.4 mm. This study suggests that the 2020 Bengkulu earthquake occurred due to the subduction of the Indo-Australian plate underneath the Eurasian plate with a cumulative seismic moment of 1.73·1019 N·m, equivalent to magnitude 6.76.

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