Identifikasi Potensi Longsor Menggunakan Metode VLF-EM di Dusun Brau, Desa Gunungsari, Kecamatan Bumiaji, Kota Batu

Faisaluddin, Muh. Hanif (2021) Identifikasi Potensi Longsor Menggunakan Metode VLF-EM di Dusun Brau, Desa Gunungsari, Kecamatan Bumiaji, Kota Batu. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Kota Batu terletak di area pegunungan sehingga memiliki daerah-daerah berbukit dengan lereng dan tebing yang berpotensi longsor. Penelitian ini bertujuan untuk mengetahui daerah yang berpotensi longsor menggunakan hasil analisa data VLF-EM. Pengukuran dilakukan di Dusun Brau, Desa Gunungsari, Kecamatan Bumiaji, Kota Batu dengan menggunakan 5 lintasan. Data pengukuran (In-phase dan Quadrature) masih bercampur dengan noise sehingga perlu dilakukan reduksi noise dengan menggunakan metode Noise Assisted-Multivariate Empirical Mode Decomposition (NA-MEMD). Data hasil NA-MEMD dianalisa menggunakan filter Fraser dan Karous-Hjelt untuk memperoleh interpretasi kualitatif persebaran anomali resistif dan konduktif, sedangkan inversi data hasil NA-MEMD digunakan untuk menghasilkan nilai resistivitas 2D yang berfungsi untuk interpretasi kuantitaif bawah permukaan. Penampang resistivitas 2D dikorelasikan dengan hasil analisa kualitatif dan kondisi lapangan yang telah terjadi tanah longsor sebelumnya. Hasil korelasi menunjukkan bahwa daerah rawan longsor ditandai dengan anomali konduktif yang diduga disebabkan oleh saturasi fluida yang berlebihan dengan nilai resistivitas ±30 Ωm. Anomali konduktif ini umumnya terletak pada kedalaman ±15 m.
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Batu City is located in a mountainous area, so it has hilly areas with slopes and cliffs that have the potential of landslide. This study aims to find out potential landslide areas using the results of VLF-EM data analysis. The measurement was conducted in Brau, Gunungsari Village, Bumiaji District, Batu using 5 tracks. Measurement data (in-phase and quadrature) are still mixed with noise, so noise reduction is needed using the Noise Assisted-Multivariate Empirical Mode Decomposition (NA-MEMD) method. NA-MEMD result data was analyzed using Fraser and Karous-Hjelt filters to obtain qualitative interpretations of resistive and conductive anomalous distribution, while inversion of NA-MEMD result data was used to produce 2D resistivity values that served for subsurface quantitative interpretation. The cross-section of 2D resistivity is correlated with qualitative analysis result and field conditions that have occured in previous landslides. The correlation results showed that landslide-prone areas were characterized by conductive anomalies thought to be caused by excessive fluid saturation with resistivity values ±30 Ωm. These conductive anomalies are generally located at depths of ±15 m.

Item Type:	Thesis (Undergraduate)
Uncontrolled Keywords:	Filter data VLF-EM, Resistivitas 2D, Saturasi Fluida, Tanah Longsor, VLF-EM data filter, 2D Resistivity, Fluid Saturation, Landslide
Subjects:	Q Science > QE Geology > QE599 Landslides. Rockslides
Divisions:	Faculty of Science and Data Analytics (SCIENTICS) > Physics > 45201-(S1) Undergraduate Thesis
Depositing User:	Muh. Hanif Faisaluddin
Date Deposited:	23 Aug 2021 00:53
Last Modified:	23 Aug 2021 00:53
URI:	http://repository.its.ac.id/id/eprint/88508

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