Analisis Mikrotremor Dengan Metode HVSR Untuk Mikrozonasi Kecamatan Bahodopi Kabupaten Morowali

Setiawan, Novian Arif (2020) Analisis Mikrotremor Dengan Metode HVSR Untuk Mikrozonasi Kecamatan Bahodopi Kabupaten Morowali. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Gerakan tanah merupakan bencana yang sering terjadi di kabupaten Morowali. Kecamatan Bahodopi merupakan salah satu kecamatan di Morowali yang sering mengalami dampak kerusakan dari gerakan tanah. Salah satu factor yang menjadi pemicu kerusakan akibat gerakan tanah adalah karakteristik dinamika tanah seperti frekuensi natural, ketebalan sedimen, amplifikasi, dan indeks kerentanan tanah. Pengukuran data mikrotremor dilakukan di Kecamatan Bahodopi Kabupaten Morowali untuk mengetahui parameter dinamika karakteristik tanah yang rentan terhadap bahaya gerakan tanah berdasarkan frekuensi natural (f0), ketebalan sedimen (h), amplifikasi (A0), dan indeks kerentanan tanah (Kg). Analisis data mikrotremor menggunakan metode HVSR dengan software geopsy untuk mendapatkan dua parameter utama yaitu f0 dan A0. Selanjutnya menghitung nilai h dan Kg menggunakan metode Kanai. Hasil penelitian didapatkan nilai frekuensi natural 0,731 – 11,520 Hz, amplitude HVSR 2,254 - 16,932, ketebalan sedimen 7-85 meter dan indeks kerentanan tanah bernilai 0,62 – 224,934. Berdasarkan parameter-parameter karakteristik dinamika tanah daerah penelitian, daerah yang berpotensi mengalami kerusakan yang lebih tinggi berada pada nilai frekuensi natural rendah yang berasosiasi dengan amplifikasi tinggi dan indeks kerentanan tanah diatas 10. Berdasarkan data tersebut dan validasi dari kejadian gempa Bantul pada titik MKT-12, MKT-18 dan MKT-22 akan mengalami kerusakan paling parah jika didirikan bangunan akibat gempa bumi. Hal ini dikarenakan pada daerah tersebut memiliki nilai frekunsi natural rendah, amplifikasi tinggi dan indeks kerentanan tanah yang tinggi. ================================================================================================================== Ground movement is a disaster that occurs frequently in Morowali. Bahodopi is one of the sub-districts in Morowali which suffers damage from ground movements. Factors that triggers damage due to ground movement is characteristics of soil dynamics such as natural frequency, thickness of the sediment, amplification, and soil vulnerability index. Microtremor data measurements were carried out in Bahodopi District, Morowali Regency to determine the dynamic parameters of soil characteristics that are susceptible to soil movement hazards based on natural frequency (f0), sediment thickness (h), amplification (A0), and soil vulnerability index (Kg). Microtremor data analysis using the HVSR method with geopsy software to get two main parameters f0 and A0. Next, the h and Kg values were calculated using the Kanai method. The results showed natural frequency values of 0.731 - 11.520 Hz, amplitude of HVSR 2.254 - 16.932, sediment thickness of 7-85 meters and soil vulnerability index value of 0.62 - 224.934. Based on the parameters of the soil dynamics characteristics, the area that has the potential to suffer higher damage is at a low natural frequency value associated with high amplification and soil vulnerability index above 10. Based on these data and the validation of the Bantul earthquake at MKT-12 point, MKT-18 and MKT-22 will suffer the most damage due to an earthquake. This is because the area has a low natural frequency value, high amplification and a high soil vulnerability index.

Item Type: Thesis (Undergraduate)
Uncontrolled Keywords: Amplitudo, Bahodopi, HVSR, Mikrotremor, Mikrozonasi, Amplification, Bahodopi, HVSR, Microtremor, Microzonation
Subjects: T Technology > TA Engineering (General). Civil engineering (General) > TA749 Soil stabilization
Divisions: Faculty of Civil Engineering and Planning > Geophysics Engineering > 33201-(S1) Undergraduate Thesis
Depositing User: Novian Arif Setiawan
Date Deposited: 23 Aug 2020 04:03
Last Modified: 23 Aug 2020 04:03
URI: https://repository.its.ac.id/id/eprint/80086

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