Prayitna, Yusri (2018) Analisis Potensi Longsor Menggunakan Metode Seismik Refraksi dan MASW di Desa Tugurejo Kabupaten Ponorogo. Masters thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Wilayah Ponorogo merupakan salah satu daerah di Indonesia yang memiliki ancaman longsor yang nyata, hal ini disebabkan karena bentuk morfologi yang bervariasi seperti dataran tinggi dan perbukitan. Salah satu daerah yang berpotensi mengalami longsor adalah Desa Tugurejo di Kecamatan Slahung. Kestabilan suatu lereng terhadap longsor dipengaruhi oleh parameter mekanik dan kondisi hidrologis. Penelitian ini bertujuan untuk mengetahui sifat fisis dan mekanik batuan dengan parameter poisson’s ratio di daerah yang mengalami pergerakan tanah di Desa Tugurejo. Metode yang digunakan adalah SRT (Seismik Refraction Tomography) dan MASW (Multi-channel Analysis of Surface Waves). Distribusi nilai kecepatan gelombang-P dan gelombang-S menunjukkan adanya lapisan denngan kecepatan rendah dengan rentang antara 500-1200 m/s dan 150-350 m/s pada kedalaman dibawah 5 m, lapisan ini diidentifikasi sebagai lapisan lapuk. Selain itu dari hasil analisis poisson’s ratio, diketahui bagian mengalami kelongsoran terdiri dari lapisan lapuk yang jenuh dan lapisan konglomerat jenuh. Hal ini berkorelasi dengan hasil analisis nilai modulus shear dan modulus young yang rendah.
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Ponorogo is one of the regions in Indonesia that has a real threat of landslides, this is due to varied morphological forms such as highlands and hills. One of its areas that has the potential of landslides is Tugurejo Village in Slahung District. The stability of a slope against landslides is influenced by mechanical parameters and hydrological conditions. This study aims to determine the physical and mechanical properties of rocks with Poisson's ratio parameters in areas that experienced soil movement in Tugurejo Village. The methods used are SRT (Seismic Refraction Tomography) and MASW (Multi-channel Analysis of Surface Waves). The distribution of the P-wave velocity and S-wave shows the presence of a low velocity layer with a range between 500-1200 m/s and 150-350 m/s at depths below 5 m, this layer is identified as a weathered layer. In addition, from the analysis of Poisson's ratio, it is known that the parts which experiencing landslides consist of saturated weathered layers and saturated conglomerate layers. This correlates with the results of the analysis of the shear modulus and low young modulus values.
| Item Type: | Thesis (Masters) |
|---|---|
| Additional Information: | RTG 551.307 Pra a-1 2018 |
| Uncontrolled Keywords: | Longsor, Seismik Refraksi, MASW, Poisson’s Ratio |
| Subjects: | Q Science > QC Physics Q Science > QC Physics > QC221 Acoustics. Sound Q Science > QC Physics > QC610.3 Electric conductivity Q Science > QE Geology Q Science > QE Geology > QE471 Sedimentary rocks. Sedimentology Q Science > QE Geology > QE538.5 Seismic tomography; Seismic waves. Elastic waves Q Science > QE Geology > QE539.2.S4 Seismic models Q Science > QE Geology > QE599 Landslides. Rockslides Q Science > QE Geology > QE601 Geology, Structural |
| Divisions: | Faculty of Civil, Environmental, and Geo Engineering > Geomatics Engineering > 29101-(S2) Master Theses |
| Depositing User: | Prayitna Yusri |
| Date Deposited: | 11 Jun 2021 07:24 |
| Last Modified: | 11 Jun 2021 07:24 |
| URI: | http://repository.its.ac.id/id/eprint/60479 |
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