Potensi Likuifaksi Tanah Berdasarkan Pengukuran Mikrotremor Studi Kasus Kecamatan Puger, Jember

Noor, Muhammad Reza Shalahuddin (2017) Potensi Likuifaksi Tanah Berdasarkan Pengukuran Mikrotremor Studi Kasus Kecamatan Puger, Jember. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Likuifaksi merupakan fenomena hilangnya kekuatan tanah akibat naiknya tekanan pori dan turunnya tekanan efektif dari lapisan tanah akibat beban siklis dinamis. Wilayah kecamatan Puger merupakan daerah yang memiliki dataran alluvial pantai yang luas dan rawan terjadi gempabumi karena terletak pada jalur tektonik sehingga berpotensi mengalami likuifaksi. Analisis mikrotremor menggunakan metode HVSR dilakukan di wilayah kecamatan Puger untuk memetakan potensi likuifaksi di daerah tersebut. Dari pengukuran mikrotremor yang telah dilakukan, didapatkan hasil berupa sebaran nilai frekuensi natural 0,3 – 1,4 Hz, nilai faktor amplifikasi gelombang di daerah penelitian memiliki nilai yang berkisar antara 2,6 – 9,1, ketebalan dari lapisan sedimen di lokasi penelitian didapatkan hasil yang berkisar antara 36-169 meter. Indeks kerentanan seismik (Kg) pada penelitian ini berkisar 14,4 – 120. Indeks kerentanan tinggi berada di sepanjang wilayah pesisir bagian Selatan kecamatan Puger. ======================================================================================================================== Liquefaction is a phenomenon of soil strength loss due to increased pore pressure and decreased effective pressure of the soil layer due to dynamic cyclic load. Puger subdistrict coastal area is an area that has a broad coastal alluvial plains and prone to occur because the earthquake is located on the path tectonic so prone to liquefaction occurs. The microtremor analysis using the HVSR method was conducted in the coastal area of Puger subdistrict to map potential liquefaction in the coastal area. From the measurements of mikrotremor that has been done, obtained the result of the distribution of natural frequency value 0.3 - 1.4 Hz, wave amplification factor value in the research area has a value ranging from 2.6 to 9.1, the thickness of the sediment layer at the study site obtained results ranging from 36-169 meters. The seismic vulnerability index (Kg) in this study ranged from 14.4 to 120. The high vulnerability index was located along the southern coastal areas of Puger subdistrict.

Item Type: Thesis (Undergraduate)
Uncontrolled Keywords: Liquifaction, HVSR method, natural frequency, amplification factor, thickness of the sediment layer, vulnerability index, Puger subdistrict
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: MUHAMMAD R SHALAHUDDIN NOOR
Date Deposited: 18 Aug 2017 03:32
Last Modified: 05 Mar 2019 03:29
URI: https://repository.its.ac.id/id/eprint/42201

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