ANALISIS ANOMALI GGMPLUS TERHADAP STRUKTUR GEOLOGI BAWAH PERMUKAAN DAERAH KEBAN JATI DAN SEKITARNYA, KABUPATEN BENGKULU SELATAN

KAMIL, FADHELLATUL and Setiawan, Budhi (2022) ANALISIS ANOMALI GGMPLUS TERHADAP STRUKTUR GEOLOGI BAWAH PERMUKAAN DAERAH KEBAN JATI DAN SEKITARNYA, KABUPATEN BENGKULU SELATAN. Undergraduate thesis, Sriwijaya University.

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Abstract

Identification of geological structures using the Global Gravity Model Plus (GGMPlus) gravity model by taking the area of Keban Jati and its surroundings, South Bengkulu, Bengkulu. The aim of this research is to identify subsurface geological structures and to understand the relationship between field structure data. The analysis method involves field geological information and previous studies and GGMPlus gravity model data into a Complete Bouguer anomaly map (ABL). The map analyzed the description of the characteristics of the Bouguer anomaly pattern and the results of the separation of the ABL map into regional and local gravity anomaly maps based on the upward continuation method. In addition, the ABL map was analyzed using the horizontal derivative method. Lineaments were performed on local anomaly maps and horizontal derivative anomalies to determine the direction of the dominant lineaments and their relationship to the geological structure of the field. Then a subsurface analysis on the local anomaly map of spectral filtering by making A-B incisions. The incision was carried out by advanced 2.5D modeling to identify subsurface geological structures. The results of the lineament analysis on the upward continuation local anomaly map and the horizontal derivative anomaly map show a linearity relationship pattern that tends to be northwest-southeast (BL-TG). Then based on 2.5D advanced modeling on the A-B incision the characteristics of the layer have a depth of 0 – 5000 m. The layer consists of the basement rock (average density 2.559 g/cm3), Seblat Formation (average density 2.581 g/cm3), Lemau Formation (average density 2.591 g/cm3), and Simpangaur Formation. (average density 2.482 g/cm3). From the results, there are subsurface geological structures identified such as reverse faults, strike-slip fault, and folds which have a misfit calculation value of 5.03. Based on the geological reconstruction of the research area, it is a tectonic process that developed due to tectonic inversion which caused the uplift of the basin with an NW-SE trending structure. The event is interpreted to have occurred in the Late Pliocene – Pleistocene. Keywords: Anomaly, GGMPlus, Gravity, Density, Geological Structure

Item Type:	Thesis (Undergraduate)
Uncontrolled Keywords:	Anomali, GGMPlus, Gravitasi, Densitas, Geologi Struktur
Subjects:	Q Science > QE Geology Q Science > QE Geology > QE1-996.5 Geology Q Science > QE Geology > QE500-639.5 Dynamic and structural geology Q Science > QE Geology > QE601-613.5 Structural geology
Divisions:	03-Faculty of Engineering > 34201-Geological Engineering (S1)
Depositing User:	Fadhellatul Kamil
Date Deposited:	09 Aug 2022 05:59
Last Modified:	09 Aug 2022 05:59
URI:	http://repository.unsri.ac.id/id/eprint/76891

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