Aprilia, Sovie Dwi (2024) Estimasi Kecepatan Gelombang Geser Dengan Inversi Gabungan HVSR (Horizontal To Vertical Spectral) Dan Dispersi Dari Mikrotremor Di Lingkungan Institut Teknologi Sepuluh Nopember Surabaya. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Secara geografis dan geologis, Surabaya sangat rentan terhadap bencana dan risiko gempa bumi. Kota ini terletak di antara dua sesar aktif, yaitu Sesar Waru dan Sesar Surabaya, yang memiliki potensi gempa bumi besar dengan skala mencapai 6,5 Richter, menyebabkan kerusakan ringan hingga berat tergantung pada kekuatan gempa. Oleh karena itu, diperlukan kesiapan untuk menghadapi keadaan darurat dan risiko akibat bencana gempa di lingkungan ITS Surabaya. Penelitian ini bertujuan untuk mengestimasi kecepatan gelombang geser (Vs) di lingkungan Institut Teknologi Sepuluh Nopember (ITS) Surabaya melalui penerapan metode inversi gabungan HVSR (Horizontal to Vertical Spectral Ratio) dan dispersi mikrotremor. Melalui metode inversi gabungan HVSR dan dispersi mikrotremor, diperoleh estimasi model kecepatan gelombang geser (Vs) 1D yang menunjukkan empat lapisan tanah di area Institut Teknologi Sepuluh Nopember Surabaya. Model 1 menunjukkan lapisan tanah dengan ketebalan 10.5 meter dan Vs 105.08 m/s, lapisan kedua dengan ketebalan 14.38 meter dan Vs 207.15 m/s, serta lapisan ketiga dengan Vs 402.63 m/s. Model 2 memiliki lapisan permukaan dengan ketebalan 8.00 meter dan Vs 76.2 m/s, diikuti lapisan kedua dengan Vs 214.56 m/s. Model 3 menunjukkan lapisan pertama dengan ketebalan 1.10 meter dan Vs 65.82 m/s, diikuti lapisan kedua dengan ketebalan 6.90 meter dan Vs 79.16 m/s, serta lapisan ketiga dengan ketebalan 0.90 meter dan Vs 159.82 m/s, dengan lapisan dasar memiliki Vs 209.95 m/s. Analisis variasi kecepatan gelombang geser menunjukkan heterogenitas geologi yang signifikan, dengan lapisan permukaan lebih lunak yang dapat menyebabkan amplifikasi getaran selama gempa bumi. Temuan ini penting untuk perencanaan infrastruktur tahan gempa dan strategi mitigasi risiko di area ITS Surabaya.
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Geographically and geologically, Surabaya is highly vulnerable to earthquake disasters and risks. The city is located between two active faults, namely the Waru Fault and the Surabaya Fault, which have the potential for large earthquakes with scales reaching 6.5 Richter, causing mild to severe damage depending on the strength of the earthquake. Therefore, it is necessary to be prepared to deal with emergencies and risks due to earthquake disasters in the ITS Surabaya environment. This research aims to estimate the shear wave velocity (Vs) in the environment of Institute of Technology Sepuluh Nopember (ITS) Surabaya through the application of the combined inversion method of HVSR (Horizontal to Vertical Spectral Ratio) and microtremor dispersion. Through the combined inversion method of HVSR and microtremor dispersion, a 1D shear wave velocity (Vs) model estimation is obtained which shows four soil layers in the area of Institute of Technology Sepuluh Nopember Surabaya. Model 1 shows a soil layer with a thickness of 10.5 meters and Vs 105.08 m/s, a second layer with a thickness of 14.38 meters and Vs 207.15 m/s, and a third layer with Vs 402.63 m/s. Model 2 has a surface layer with a thickness of 8.00 meters and Vs 76.2 m/s, followed by a second layer with Vs 214.56 m/s. Model 3 shows a first layer with a thickness of 1.10 meters and Vs 65.82 m/s, followed by a second layer with a thickness of 6.90 meters and Vs 79.16 m/s, and a third layer with a thickness of 0.90 meters and Vs 159.82 m/s, with the bottom layer having Vs 209.95 m/s. The shear wave velocity variation analysis shows significant geological heterogeneity, with softer surface layers that can cause vibration amplification during earthquakes. These findings are important for earthquake-resistant infrastructure planning and risk mitigation strategies in the ITS Surabaya area.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Dispersi Mikrotremor, Gelombang Geser, Inversi HVSR, Sesar Aktif, Microtremor Dispersion, Shear Waves, HVSR Inversion, Active Faulting |
| Subjects: | Q Science > QE Geology > QE539.2 Seismic traveltime inversion |
| Divisions: | Faculty of Science and Data Analytics (SCIENTICS) > Physics > 45201-(S1) Undergraduate Thesis |
| Depositing User: | Sovie Dwi Aprilia |
| Date Deposited: | 21 Aug 2024 02:46 |
| Last Modified: | 21 Aug 2024 02:46 |
| URI: | http://repository.its.ac.id/id/eprint/114380 |
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