Mikrozonasi Potensi Rawan Longsor Menggunakan Data Mikrotremor di Dusun Brau, Desa Gunungsari, Kecamatan Bumiaji, Kota Batu, Jawa Timur

Henrizky, Bramantia Putra (2021) Mikrozonasi Potensi Rawan Longsor Menggunakan Data Mikrotremor di Dusun Brau, Desa Gunungsari, Kecamatan Bumiaji, Kota Batu, Jawa Timur. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Dusun Brau merupakan salah satu dusun di Kota Batu yang sering mengalami bencana longsor. Dusun Brau terletak pada daerah perbukitan dan disusun atas Batuan Gunungapi Anjasmara Tua. Jenis tanah pada dusun ini merupakan hasil dari pelapukan batuan gunung api yang umumnya bersifat permeabel. Longsor yang terjadi di dusun ini disebabkan oleh saturasi air yang berlebih dikarenakan hujan. Oleh karena itu, perlu dilakukannya penentuan lokasi potensi longsor dengan menggunakan analisa Horizontal to Vertical Spectral Ratio dari data mikrotremor. Hasil dari pengolahan HVSR ini berupa frekuensi natural dan amplifikasi. Kedua parameter tersebut digunakan untuk menentukan indeks kerentanan tanah, ground shear strain, dan percepatan getaran minimum yang selanjutnya hasil pengolahan dipetakan. Hasil mikrozonasi indeks kerentanan tanah, ground shear strain, dan percepatan getaran minimum menunjukkan bahwa daerah bagian utara dan barat Dusun Brau sangat berpotensi akan terjadinya longsor. Hal ini diduga karena saturasi air yang berlebih pada lapisan sedimen, sehingga meningkatkan nilai amplifikasi tanah.
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Brau is one of the villages in Batu City which often occurs landslides. Brau is located at hilly area and is composed of Old Anjasmara Volcanic Rock. The type of soil in this village is the result of weathering of volcanic rocks which are generally permeable. The landslide that occurred in this village was caused by excessive water saturation due to rain. Therefore, it is necessary to determine the location of potential landslides using Horizontal to Vertical Spectral Ratio analysis from microtremor data. The result of HVSR processing is natural frequency and amplification. These two parameters are used to determine the soil susceptibility index, ground shear strain, and minimum ground acceleration then the results will be formed a map. The results of microzonation of soil susceptibility index, ground shear strain, and minimum ground acceleration indicate that the northern and western Brau village area has a high potential for landslides. This is expected due to excessive water saturation in the sediment layer, therefor increasing the amplification of the soil.

Item Type:	Thesis (Undergraduate)
Uncontrolled Keywords:	HVSR, landslide, microtremor, shear strain, HVSR, longsor, mikrotremor, shear strain.
Subjects:	Q Science > QC Physics
Divisions:	Faculty of Science and Data Analytics (SCIENTICS) > Physics > 45201-(S1) Undergraduate Thesis
Depositing User:	Bramantia Putra Henrizky
Date Deposited:	20 Aug 2021 11:15
Last Modified:	20 Aug 2021 11:15
URI:	http://repository.its.ac.id/id/eprint/88989

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