gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2024-15-4-0772FWESLMgtcrust-1884Research ArticleСОВРЕМЕННАЯ ГЕОДИНАМИКАRECENT GEODYNAMICSАНАЛИЗ ПОДЗЕМНОГО ПРОСТРАНСТВА ГОРОДА БАНДАР-ЛАМПУНГ НА ОСНОВЕ ГРАВИТАЦИОННЫХ АНОМАЛИЙANALYSIS OF SUBSURFACE STRUCTURE OF BANDAR LAMPUNG CITY BASED ON GRAVITY ANOMALIESДаниИ.DaniI.

35141, Бандар-Лампунг

Bandar Lampung 35141

ilham.dani0917@eng.unila.ac.idЗаенудинА.ZaenudinA.

35141, Бандар-Лампунг

Bandar Lampung 35141

ХутомоА. И.HutomoA. I.

35141, Бандар-Лампунг

Bandar Lampung 35141

ЮнизаН.YunizaN.

35141, Бандар-Лампунг

Bandar Lampung 35141

Университет ЛампунгаИндонезияLampung UniversityIndonesia202418082024154772772Copyright © Дани И., Заенудин А., Хутомо А.И., Юниза Н., 20242024Дани И., Заенудин А., Хутомо А.И., Юниза Н.Dani I., Zaenudin A., Hutomo A.I., Yuniza N.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/1884

Город Бандар-Лампунг расположен на юго-восточной оконечности о. Суматра, в районе с высоким уровнем подверженности землетрясениям и цунами. По всей длине о. Суматра, вдоль горного хребта Букит-Барисан, проходят сейсмические разломы. Одним из таких разломов в районе Бандар-Лампунг является разлом Панджанг-Лампунг. Гравитационные методы, обычно используемые для определения подземных пространств, основываются на изменении плотности пород. Цель данного исследования – выявление структуры подземного пространства г. Бандар-Лампунг на основе 2D и 3D моделирования гравитационных аномалий. Исследование состоит из трех основных стадий: коррекции данных, обработки данных (включая спектральный анализ, скользящее среднее и анализ вторых вертикальных производных), а также моделирования подземного пространства. Полные аномалии Буге изучаемой территории варьируются в пределах 41.9–73.3 мГал. Результаты моделирования указывают на наличие таких структур, как разлом Панджанг-Лампунг в северной части и грабен в центральной части, подтвержденное анализом вторых вертикальных производных и геологическими данными. Существование разлома Панджанг-Лампунг, классифицируемого в качестве активного разлома, наряду с вулканическими пирокластическими породами и достаточно мощными слоями осадочных пород, способствует потенциальному усилению подземных толчков на изучаемой территории в случае возникновения землетрясения.

Bandar Lampung City is located at the southeastern tip of Sumatra Island, an area highly prone to earthquake and tsunami disasters. Along the Sumatra Island, there are seismic faults stretching along the Bukit Barisan Mountains. In the Bandar Lampung region, one of these faults is the Panjang Lampung fault. Gravity methods are commonly used to identify subsurface structures based on variations in rock density. This study aims to identify the subsurface structure of Bandar Lampung City based on gravity anomaly modeling, both 2D and 3D models. The research consists of three main stages: data correction, data processing including spectrum analysis, moving average, second vertical derivative analysis, and subsurface structure modeling. The complete Bouguer anomalies in the study area range from 41.9 mGal to 73.3 mGal. Modeling results indicate the presence of structures such as the Panjang Lampung fault in the Northeast and a graben in the Central region, verified through SVD analysis and geological information. The existence of the Panjang Lampung fault, classified as an active fault, along with volcanic pyroclastic rocks and significant sediment layers in the central region, makes the research area potentially susceptible to the impact of amplification in the event of an earthquake disaster.

гравитационная аномалия2D и 3D моделиподземное пространстворазлом Панджанг-Лампунганализ вторых вертикальных производныхgravity anomaly2D and 3D modelssubsurface structurePanjang Lampung faultSVD analysisИсследование финансировалось из бюджета инженерного факультета Университета Лампунга.The study was funded from the budget of Faculty of Engineering of the Lampung UniversityReferencesAkinin V.V., Zhulanova I.L., 2016. Age and Geochemistry of Zircon from the Oldest Metamorphic Rocks of the Omolon Massif (Northeast Russia). Geochemistry International 54, 651–659. https://doi.org/10.1134/S0016702916060021.Akinin V.V., Zhulanova I.L., 2016. Age and Geochemistry of Zircon from the Oldest Metamorphic Rocks of the Omolon Massif (Northeast Russia). Geochemistry International 54, 651–659. https://doi.org/10.1134/S0016702916060021.Ali U., Ali S.A., 2020. Comparative Response of Kashmir Basin and Its Surroundings to the Earthquake Shaking Based on Various Site Effects. 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The authors declare that there are no conflicts of interest present.