Estimasi Ketebalan Lapisan Sedimen dan Amplifikasi Desa Olak Alen Blitar Menggunakan Metode Mikrotremor HVSR

Sitorus, Nomensen M.H. (2017) Estimasi Ketebalan Lapisan Sedimen dan Amplifikasi Desa Olak Alen Blitar Menggunakan Metode Mikrotremor HVSR. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Tanah longsor yang terjadi di Desa Olak Alen Blitar pada Desember 2016 berada di lokasi dengan lapisan sedimen yang tebal (>30meter). Lapisan sedimen yang tebal dan berasosiasi dengan kemiringan lereng yang tinggi sangat rentan terhadap potensi gerakan tanah. Selain itu faktor perbesaran perambatan gelombang (Amplifikasi) yang semakin tinggi juga akan meningkatkan resiko terjadinya gerakan tanah. Oleh karena itu telah dilakukan pengukuran mikrotremor dengan metode HVSR di Desa Olak Alen. Melalui metode HVSR akan diperoleh nilai amplifikasi dan frekuensi natural dari kurva H/V. Berdasarkan nilai frekuensi natural dan N-SPT dari data bor dihitung nilai ketebalan sedimen. Ketebalan lapisan sedimen Desa Olak Alen berkisar antara 17,03 – 221,39 meter dengan nilai amplifikasi antara 1,3 – 6,2. Longsor yang terjadi di Desa Olak Alen berada di lokasi dengan ketebalan lapisan sedimen 52-87 meter dan nilai amplifikasi 4,1 – 5,7 Kata Kunci : Ketebalan sedimen, amplifikasi, frekuensi natural, HVSR. ===================================================================== The landslide in the village of Olak Alen Blitar in December 2016 is in a location with a thick sedimentary layer (> 30meter). A thick layer of sediment and associated with a high slope of the slope is very susceptible to the potential of ground motion. In addition, the increasing factor of wave propagation (Amplification) will also increase the risk. Therefore, microtremor measurement has been done with HVSR method in Olak Alen Village. By HVSR method will obtain the amplitude and natural frequency from the H / V curve. Based on the value of natural frequency and N-SPT from the drill data is calculated the value of sediment thickness. The thickness of the sediment layer of Olak Alen Village ranges from 17.03 - 221.39 meters with an amplification value between 1.3 - 6.2. The Landslide Occurring in Olak Alen Village is in a location with a thickness of 52-87 meter sediment layer and an amplification value of 4.1 - 5.7 Keywords : Sediment thickness, amplification, natural frequency, HVSR

Item Type: Thesis (Undergraduate)
Uncontrolled Keywords: Ketebalan sedimen, amplifikasi, frekuensi natural, HVSR.
Subjects: Q Science > QE Geology
T Technology > TA Engineering (General). Civil engineering (General)
Divisions: Faculty of Civil Engineering and Planning > Geophysics Engineering > 33201-(S1) Undergraduate Thesis
Depositing User: Nomensen M. H. Sitorus
Date Deposited: 31 Jan 2018 02:31
Last Modified: 08 Mar 2019 06:19
URI: https://repository.its.ac.id/id/eprint/45589

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