Cahya, Achmad Dwi (2020) Identifikasi Struktur Bawah Permukaan Menggunakan Metode Gaya Berat Dengan Inversi Singular Value Decomposition dan Inversi Occam di Area Karst Pacitan. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Kondisi geologi wilayah Pacitan umumnya berupa vulkanik dan karst. Satuan Karst menyebar di sepanjang pantai selatan, terutama disusun oleh batu gamping, yang setempat bersifat tufan. Permasalahan yang kompleks dan proses geologi yang beragam di daerah karst memerlukan metode geofisika yang khusus dalam penelitian. Salah satu metode yang dapat digunakan adalah metode gaya berat. Penggunaan metode ini cukup efektif karena dapat mendelineasi struktur bawah permukaan. Pemodelan inversi 2D akan menghasilkan model densitas dengan visualisasi dan resolusi kedalaman. Pemodelan inversi secara 2D ini dilakukan terhadap data anomali residual menggunakan perangkat lunak Grablox, yang menggabungkan 2 (dua) metode inversi yaitu Singular Value Decomposition dan inversi Occam. Kemudian model penampang densitas tersebut dianalisis berdasarkan informasi geologi untuk menghasilkan interpretasi model bawah permukaan yang lebih akurat. Dalam penelitian ini struktur geologi berupa sesar dapat terlihat pada lintasan barat – timur dengan koordinat X 506 – 507,5. Dan pada lintasan selatan – utara struktur geologi berupa sesar terlihat pada koordinat Y 9102 – 9103. Ketebalan karbonat pada lintasan barat – timur memiliki ketebalan 100 meter hingga 750 meter. Batuan karbonat semakin ke arah timur semakin masif. Sementara itu ketebalan karbonat pada lintasan selatan – utara memiliki ketebalan 600 meter hingga 750 meter.
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The geological conditions in the Pacitan region are mainly volcanic and karstic. Karst units spread along the south coast, mainly composed by limestone, which is locally tuff. Complex problems and diverse geological processes in karstic areas require special geophysical methods in research. One method that can be used is the gravity method. The use of this method is quite effective because it can delineate subsurface structures. 2D inversion modeling will produce density models with depth visualization and resolution. 2D inversion modeling is performed on residual anomaly data using Grablox software, which combines 2 (two) inversion methods, namely Singular Value Decomposition and Occam inversion. Then the density cross section model is analyzed based on geological information to produce a more accurate interpretation of subsurface models. In this study the geological structure in the form of a fault can be seen in the west-east path with coordinates X 506 - 507.5. And on the south - north path the geological structure in the form of a fault is seen at coordinates Y 9102 - 9103. The thickness of the carbonate on the west - east path has a thickness of 100 meters to 750 meters. Carbonate rocks are getting more and more eastward. Meanwhile carbonate thickness on the south-north line has a thickness of 600 meters to 750 meters
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Geologi Struktur, Singular Value Decomposition (SVD), Occam |
| Subjects: | G Geography. Anthropology. Recreation > GB Physical geography Q Science > QC Physics > QC111 Density and specific gravity Q Science > QE Geology > QE601 Geology, Structural |
| Divisions: | Faculty of Civil Engineering and Planning > Geophysics Engineering > 33201-(S1) Undergraduate Thesis |
| Depositing User: | Achmad Dwi Cahya |
| Date Deposited: | 29 Aug 2020 04:36 |
| Last Modified: | 26 May 2023 00:05 |
| URI: | http://repository.its.ac.id/id/eprint/81574 |
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