litosphereЛитосфераLITHOSPHERE (Russia)1681-90042500-302XA.N. Zavaritsky Institute of Geology and Geochemistry10.24930/2500-302X-2025-25-1-44-60AGCQHJlitosphere-2232Research ArticleСтатьиArticlesИсследование структурной геологии, контролирующей Опакскую разлому на формации Семилир в Йогякарте, ИндонезияInvestigating the Structural Geology Control of the Opak Fault on the Semilir Formation in YogyakartaФарисанА.FarisanA.

Ардхан Фарисан

Бандунг

Ardhan Farisan

Bandung

ardh005@brin.go.idНурвантариН. А.NurwantariN. A.

Нанда Адженг Нурвантари - Кафедра геологического инжиниринга, Факультет минеральных технологий.

Йогякарта

Nanda Ajeng Nurwantari - Geological Engineering Department, Faculty of Mineral Technology.

Yogyakarta

Фадлин.Fadlin.

Кафедра геологического инжиниринга.

Пурвокерто

Purwokerto

РахарджоП. Д.RaharjoP. D.

Пугух Дви Рахарджо

Бандунг

Puguh Dwi Raharjo

Bandung

ardh005@brin.go.idПусвантоЭ.PuswantoE.

Эко Пусванто

Бандунг

Eko Puswanto

Bandung

ВидийантоК.WidiyantoK.

Кристиаван Видийанто

Бандунг

Kristiawan Widiyanto

Bandung

ВибовоД. А.DimasA. W.

Димас Арьо Вибово

Бандунг

Dimas Aryo Wibowo

Bandung

Научно-исследовательский центр по геологическим ресурсам, Национальное агентство научных исследований и инновацийИндонезияResearch Centre for Geological Resource, National Research and Innovation AgencyIndonesiaУниверситет Ветеранов Национального РазвитияИндонезияUniversity of Pembangunan Nasional VeteranIndonesiaУниверситет Джендерал СудирманИндонезияGeological Engineering Department, University of Jenderal SudirmanIndonesiaНаучно-исследовательский центр по геологическим ресурсам, Национальное агентство научных исследований и инновацийРоссияНаучно-исследовательский центр по геологическим ресурсам, Национальное агентство научных исследований и инновацийRussian Federation2025100320252514460Copyright © Фарисан А., Нурвантари Н.А., Фадлин .., Рахарджо П.Д., Пусванто Э., Видийанто К., Вибово Д.А., 20252025Фарисан А., Нурвантари Н.А., Фадлин .., Рахарджо П.Д., Пусванто Э., Видийанто К., Вибово Д.А.Farisan A., Nurwantari N.A., Fadlin .., Raharjo P.D., Puswanto E., Widiyanto K., Dimas A.W.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://www.lithosphere.ru/jour/article/view/2232Тема исследования

Тема исследования. Морфология холмов, сформировавшаяся в исследуемой зоне, входящей в состав Формации Семилир, предположительно является результатом реактивации разлома Опак. Для подтверждения этого утверждения требуется дальнейшее исследование.

Цель

Цель. Исследовать характеристики разлома Опак в Формации Семилир. Исследовательская зона – красная зона, пострадавшая от землетрясения, произошедшего в 2006 году из-за разлома Опак.

Материалы и методы

Материалы и методы. Исследование проводилось на основе интегрированных данных, включая цифровую модель рельефа (DEM) от DEMNAS (Индонезийская национальная цифровая модель рельефа), цифровую модель разрезов (DOM) и обширные полевые наблюдения. Методика включала анализ интерпретации DOM в сочетании с полевыми обследованиями и методами морфотектоники.

Результаты

Результаты. Была выделена зона исследования, разделенная на два сегмента: северный и южный. Характеризация этих сегментов основана на различиях в выравнивании рельефа, связанных с общим направлением холмов, и анализе розеточных диаграмм. В северном регионе элонгированные холмы ориентированы в направлении северовосток–юго-запад, в то время как на юге они образуют блочную линеацию север–юг. Полевые наблюдения выявили присутствие высокоугольного разлома в точке наблюдения А (рис. 6a), указывающего на реактивацию, а также обратного разлома в точке наблюдения D1 (рис. 6b). Результаты розеточной диаграммы показывают направление компрессии северного сегмента NW-SE и южного сегмента N-S.

Выводы

Выводы. Интеграция данных фотограмметрии с использованием БПА и цифровой модели рельефа (DEM) значительно улучшила наше понимание геологических структур в Формации Семилир в Зоне разлома Опак. Анализ показывает, что зона исследования является зоной реактивации разлома Опак, что подтверждается наличием высокоугольных обратных разломов. Эта зона реактивации и морфология ландшафта, состоящая из холмов, интерпретируются как зона разрушения, обусловленная движением разлома Опак, ранее определенного как разлом с левым сдвигом.

Research subject

Research subject. The hill morphology formed in the study area, which is part of the Semilir Formation, is suspected to be a product of Opak fault reactivation. Further investigation is needed to substantiate this claim.

Aim

Aim. To investigate the characteristics of the Opak Fault in the Semilir Formation. The study area is a red zone, which is an area damaged by the 2006 Opak Fault earthquake.

Materials and Methods

Materials and Methods. This study was interpreted through integrated data that combined the Digital Elevation Model (DEM) from DEMNAS (Indonesian National Digital Elevation Model), the Digital Outcrop Model (DOM), and extensive field observations. The methodology employed involves investigating DOM interpretation combined with field surveys and morphotectonic methods.

Results

Results. We have identified the study area as divided into two segments: the northern and southern segments. The characterization of these segments is based on the differences in the alignment of landforms associated with the general direction of the hills and analysis from rosette diagrams. In the northern region, elongated hills are oriented in the NE-SW direction, whereas in the south, they exhibit an N-S block lineation. Field observations reveal the presence of a high-angle fault at observation point A (Fig. 6a), indicating reactivation, and a reverse fault at observation point D1 (Fig. 6b). The rosette diagram results indicate a compression direction of NW-SE in the northern segment and N-S in the southern segment.

Conclusions

Conclusions. Integrating UAV photogrammetry and Digital Elevation Model (DEM) data has significantly enhanced our understanding of the geological structures within the Semilir Formation in the Opak Fault Zone. The analysis identifies the study area as a reactivation zone of the Opak fault, indicated by the presence of high-angle reverse faults. This reactivation zone and the landscape morphology consisting of hills are interpreted as a zone of destruction resulting from Opak fault movement, previously identified as a sinistral strike-slip fault.

цифровая модель рельефацифровая модель открытого разрезаморфотектоникасбой Опакформация СемиллирDigital Elevation ModelDigital Outcrop ModelMorphotectonicOpak FaultSemilir FormationЭто исследование является самостоятельным исследованием, поддержанное соавторами в сборе данных. Автор хотел бы поблагодарить Центр исследований геологических ресурсов Национального агентства исследований и инноваций ИндонезииThis research is an independent study supported by co-authors in data collection. The author would like to thank the Research Center for Geological Resources, National Research and Innovation Agency IndonesiaReferencesAbidin, H. Z., Andreas, H., Kato, T., Ito, T., Meilano, I., Kimata, F., Natawidjaya, D. H., and Harjono, H. (2009a). Crustal deformation studies in Java (Indonesia) using GPS. J. Earthq. Tsunami, 3, 77–88. DOI:10.1142/S1793431109000445Abidin, H. Z., Andreas, H., Kato, T., Ito, T., Meilano, I., Kimata, F., Natawidjaya, D. H., and Harjono, H. (2009a). 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The authors declare that there are no conflicts of interest present.