Muhammad Zulkaromi, MZ and Nandi Haerudin, NH and Suharno, Suharno and bagus, sapto (2021) Identification of Horst and Graben Structural Patterns Using Gravity and Second Vertical Derivative (SVD) Methods in The Lubuksikaping Area of West Sumatera. Indonesian Physical Review, 4 (3). pp. 153-165. ISSN 2614-7904

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Abstract

The Lubuksikaping area is located between the main fault branching of Sumateran Fault so, there are many quite complex structures. This research was conducted to determine the structure pattern of the high (horst) and low (graben) that formed in the sub- surface of the Lubuksikaping area, West Sumatera. This research uses gravity data which will then be carried out by spectral analysis, upward continuation, separation of regional and residual anomalies, and Second Vertical Derivative (SVD) analysis. Furthermore, 2D forward modeling is carried out to determine the correlation between the 2D subsurface forward modeling and the resulting SVD graph. Based on the analysis of the regional anomaly map, the measured low anomaly is due to the area in the form of a structural valley formed due to the activity of the Sumatera Fault, while the high is thought to be a structural hill (horst) that forms an elongated mountain range and separated by graben. In addition, based on the analysis of the residual anomaly map, the low anomaly indicates the presence of a depositor (graben), whereas the high anomaly is indicated as the presence of rocks with high-density contrast values . and is interpreted as a horst structure. Based on the analysis of the horst and graben patterns in the residual Bouguer anomaly, there is elevation zone (horst) that are northwest and northeast on the residual map and it is known that there are 3 graben structures in Lubuksikaping, namely Panyabungan Graben, Rao Graben and Sumpur Graben with relative northwest-southeast direction. The 2D models of paths A-A' and B-B' show faults that are located relatively the same as SVD graph obtained from the residual SVD anomaly map.

Item Type:	Article
Subjects:	Q Science > Q Science (General) Q Science > QC Physics Q Science > QE Geology
Divisions:	Fakultas Teknik (FT) > Prodi Teknik Geofisika
Depositing User:	NANDI HAERUDIN -
Date Deposited:	03 Nov 2021 09:27
Last Modified:	03 Nov 2021 09:27
URI:	http://repository.lppm.unila.ac.id/id/eprint/34934

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