Identifikasi Segmen Timur Sesar Grindulu Menggunakan Metode Magnetik dengan Analisis Kualitatif

Lazuardi, Eden (2020) Identifikasi Segmen Timur Sesar Grindulu Menggunakan Metode Magnetik dengan Analisis Kualitatif. Undergraduate thesis, Institut Teknologi Sepuluh Nopember Surabaya.

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Abstract

Sesar Grindulu merupakan salah satu sesar aktif yang berada di Kabupaten Pacitan. Akibat dari pergerakannya, sesar Grindulu diduga menjadi salah satu penyebab gempa bumi di Kabupaten Pacitan. Untuk mengidentifikasi posisi sesar ini, metode magnetik yang memberi tanggapan terhadap variasi suseptibilitas batuan diaplikasikan. Data magnetik yang terukur dilakukan beberapa koreksi dan pemisahan anomaly local dan regional. Masing-masing anomali ini selanjutnya dianalisis menggunakan metode reduction to pole (RTP), gradien horisontal (GH), dan Analysis Signal (AS) untuk mengidentifikasi keberadaan Sesar Grindulu. Hasil GH dan AS dapat mendeteksi jalur Sesar Grindulu pada beberapa lokasi. Selanjutnya, anomali magnetik total dianalisis menggunakan metode Dekonvolusi Euler (DE) untuk mengidentifikasi posisi sumber anomali. Dengan mengintegrasikan hasil GH, AS, dan DE dapat diketahui bahwa sumber anomali magnetik yang dihasilkan menunjukkan posisi Sesar Grindulu dengan pola kelurusan sama dengan peta geologi, yakni Timur Laut-Barat Daya, namun posisi yang ditunjukkan berada lebih ke selatan daripada informasi sesar di peta geologi. Selain itu, berdasarkan analisis Dekonvolusi Euler dapat diketahui kedalaman Sesar Grindulu yang berkisar ± 1000−5000 meter. ================================================================================================================== Grindulu Fault is one of the active faults located in the Pacitan Regency. As a result of its movement, the Grindulu fault is thought to be one of the causes of the earthquake in the Pacitan Regency. Consequently, in order to identify position of the fault, magnetic method that responds to variations in rock susceptibility is applied. Measured magnetic data carried out several corrections and separation of local and regional anomalies. Each anomaly is analyzed using the reduction to pole (RTP), horizontal gradient (GH), and Analysis Signal (AS) methods to identify the presence of the Grindulu Fault. The result of GH and AS can detect Grindulu Fault lines at several locations. Furthermore, the total magnetic anomaly has analyzed using the Euler Deconvolution (ED) method to identify the position of the source of the anomaly. Using integrating of GH, AS and ED, the result can be seen that the source of the magnetic anomaly produced shows the position of the Grindulu Fault with the same alignment pattern as the geological map, namely the Northeast-Southwest, but the position shown is further south than the fault information on the geological map. In addition, the ED result also demonstrate tha the depth of the Grindulu Fault has ranges from ± 1000-5000 meters.

Item Type: Thesis (Undergraduate)
Uncontrolled Keywords: Sesar Grindulu, Anomali regional, Gradien Horisontal, Analysis Signal, Dekonvolusi Euler ================================================================================================================== Grindulu Fault, Regional Anomaly, Horizontal Gradient, Analysis Signal, Euler Deconvolution
Subjects: G Geography. Anthropology. Recreation > GB Physical geography
Q Science > QC Physics
Divisions: Faculty of Science and Data Analytics (SCIENTICS) > Statistics > 49201-(S1) Undergraduate Thesis
Depositing User: Eden Lazuardi
Date Deposited: 26 Aug 2020 03:23
Last Modified: 26 Aug 2020 03:23
URI: https://repository.its.ac.id/id/eprint/81291

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