Analisa Kerawanan Longsor Menggunakan Metode Vlf-Em Di Desa Tugurejo, Kecamatan Slahung, Kabupaten Ponorogo

Alfaritsi, Muhammad Husein (2018) Analisa Kerawanan Longsor Menggunakan Metode Vlf-Em Di Desa Tugurejo, Kecamatan Slahung, Kabupaten Ponorogo. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Geologi di Desa Tugurejo, Kecamatan Slahung, Kabupaten Ponorogo tersusun atas batuan sisipan batupasir. Karakteristik tanah tersebut memiliki porositas besar, sehingga air di permukaan lebih mudah masuk ke dalam tanah. Untuk mengetahui tingkat kerawanan longsor, diperlukan pemetaan persebaran aliran fluida bawah permukaan tanah. Pada penelitian ini, pemetaan dilakukan menggunakan metode Very Low Frequency (VLF-EM). Hasil dari analisa data VLF-EM, digunakan filter Fraser & Karous-Hjelt serta proses inversi untuk mengetahui nilai resistivitas 2D. Hasil yang diperoleh dari penelitian ini berupa anomali konduktif dan resistif. Anomali konduktif berkorelasi dengan retakan-retakan yang terdapat di lokasi penelitian dengan nilai resistivitas ± 6 ohm meter. Nilai resistivitas ini diduga disebabkan oleh adanya batuan yang telah tersaturasi dengan fluida, sehingga memiliki nilai resistivitas rendah. Tanah yang telah tersaturasi fluida ini yang dapat menyebabkan terjadinya bencana tanah longsor. =============================================================================================================== Geology in Tugurejo Village, Slahung District, Ponorogo Regency is contain of sandstone. The soil Characteristics has a large porosity, so that water on the surface more easily get into the soil. To determine the level of landslide vulnerability, it is necessary to mapping the spread of fluid flow below the soil surface. In this research, the mapping is done using Very Low Frequency (VLF-EM) method. Results of VLF-EM data analysis, used Fraser & Karous-Hjelt filter and inversion process to find out the value of 2D resistivity. The results obtained from this research are conductive and resistive anomalies. Conductive anomalies correlate with the cracks located at the study site with a resistivity value of ± 6 ohm meters. This resistivity value is thought to be caused by the presence of rocks that have been saturated with fluid, thus having a low resistivity value. Land that has been saturated this fluid that can cause a landslide disaster.

Item Type: Thesis (Undergraduate)
Uncontrolled Keywords: Inversi, Longsor, Resistivitas 2D, Saturasi Fluida
Subjects: G Geography. Anthropology. Recreation > GB Physical geography
G Geography. Anthropology. Recreation > GE Environmental Sciences
Divisions: Faculty of Mathematics and Science > Physics > (S1) Undergraduate Theses
Depositing User: Muhammad Husein Alfaritsi
Date Deposited: 09 Apr 2018 02:56
Last Modified: 10 Apr 2018 03:11
URI: http://repository.its.ac.id/id/eprint/50600

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