IDENTIFICATION OF SUBSURFACE STRUCTURES IN SOUTH BENGKULU MANNA CITY BASED ON THE MASW METHOD
DOI:
10.29303/ipr.v6i3.244Downloads
Abstract
South Bengkulu is one of the regencies in Bengkulu Province which is in an area of active tectonic plate activity, namely the India-Australia and Eurasian plates so it is prone to earthquakes. The City of Manna continues to carry out developments so that it requires various information for urban and regional planning, especially information on subsurface rock structures. This study aims to determine the structure of rock layers based on shear wave velocity (Vs), Poisson ratio, shear modulus and Young's modulus in Manna City. This research was conducted using the Multichannel Analysis of Surface Wave (MASW) method at 12 measurement stations. The tool used is the PASI 16S24-P seismograph. Data processing to produce a 1D model is WinMASW 5.0 Professional Software and to display 3-D data Voxler software is used based on the value of Vs. Then do the calculation to get the value of Vs30. Â From the results of the Vs30 value in the study area, it shows that the Manna City area consists of 4 rock types including soft soil (SE), stiff soil (SD), very dense soil and soft rock (SC) and rock (SB) rock types. The highest layering value of shear wave velocity (Vs) is at the fourth point with a value of Vs 386-1263 m/s, Poisson ratio 0.40-0.35, shear modulus 298-3652 MPa and Young's modulus 804-9430 MPa at a depth of 4.4 -30 meters. While the smallest value is at the sixth location point with a value of Vs 180-474 m/s, Poisson ratio 0.40-0.30 shear modulus 60-461 MPa, and Young's modulus 168-1.243 MPa at a depth of 2.6-30 meters.
Keywords:
Bengkulu MASW Manna Shear waveReferences
A. Firdasari & I. Idarwati, "Petrogenesa Batuan Beku Daerah Seberang Musi, Kabupaten Kepahiang, Provinsi Bengkulu", Palembang : Universitas Sriwijaya, 2017, 2–5.
D. H. Natawidjaja, "Gempabumi dan Tsunami di Sumatra dan Upaya Untuk Mengembangkan Lingkungan Hidup", Gempa Bumi, 66, 1–3, December 2007.
PuSGeN, Peta Sumber Dan Bahaya Gempa Indonesia Tahun 2017.
A. Allowenda, E. Priadi, & Aprianto, "Analisa Modulus Elastisitas Dalam Memprediksi Besarnya Keruntuhan Lateral Dinding Penahan Tanah Pada Tanah Lunak", Univ. Tanjungpura, vol. 5, 2018.
Badan Pusat Statistik, "Kabupaten Bengkulu Selatan dalam Angka 2019", Bengkulu Selatan : BPS, 2019.
Ariestianty, K. Susi, R. Taha, M. Nayan, K. A. M. Chik, & Zamri, "Penentuan Modulus Geser Tanah menggunakan Metode Analisis Multi-Channel Gelombang Permukaan", Jurnal Ilmiah Semesta Teknika, Vol. 12, No. 2, 185-198, November 2009.
H. Gercek, "Poisson’s ratio values for rocks", International Journal of Rock Mechanics and Mining Sciences, 44(1), 1–13, 2007. https://doi.org/10.1016/j.ijrmms.2006.04.011.
M. H. Yasrullah & E. Sutriyono, "Geologi dan Tektonik Neogen Daerah Kedurang dan Sekitarnya", Bengkulu Selatan : Universitas Sriwijaya, 2018.
H. Sulistiawan, "Analisis Seismic Hazard Berdasarkan Data Peak Ground Acceleration (PGA) Dan Kerentanan Gempa Menggunakan Metode Mikroseismik Di Daerah Kampus Unnes Sekaran, Gunungpati, Kota Semarang", Semarang : Universitas Negeri Semarang, pp. 1-44, 2016.
S. Atmaja & P. Rosyidi, "Analsis Potensi Likuifaksi Tanah Berbasis Teknik Gelombang Seismik", The Phinisi Press Yogyakarta : Yokyakarta, pp. 1-179, 2020.
U. Permana, K. Triyoso, & W. S. M. Sanjaya, "Pengolahan Data Seismik Refleksi 2D Untuk Memetakan Struktur Bawah Permukaan Lapangan X Prabumulih Sumatra Selatan", Permana, 2(1), 28–37, 2015.
A. Salim, "Pengukuran Modulus Elastisitas Dinamis Batuan dengan Metode Seismik Refraksi", ComTech: Computer, Mathematics and Engineering Applications, 3(2), pp. 971–976, 2012.
Linawati, T. Sulistyowati, & I. H. Muchtaranda, "Analisis Modulus Geser Maksimum Tanah Lempung Ekspansif Dengan Perkuatan Serat Ijuk Berdasarkan Metode Empiris", Spektrum Sipil, 6(1), pp. 69–78, 2019.
B. S. N. "Tata cara Perencanaan Ketahanan Gempa untuk Struktur Bangunan Gedung dan Non Gedung", Jakarta: Indonesia, (8), pp. 1–254, 2019.
J. Milsom & A. Eriksen "Geophysics Fourth Edition", University of Cambridge Press, London, UK, 2011.
S. Mandasari, Asrillah & I. Rusydy, "Studi Likuifaksi Menggunakan Nilai Poisson’s Ratio di Kecamatan Meurah Dua, Pidie Jaya", Jurnal Ilmiah Mahasiswa Teknik Kebumian, 1(1), pp. 18–22, 2017.
N. Ikhsan, F. Fahriani, & Y. Apriyanti, "Pengarauh Angka Poisson dan Modulus Geser Tanah Terhadap Amplitudo dan Frekuensi pada Pemodelan Fondasi Blok tidak Tertanam untuk Mesin Diesel", Jurnal Teknik Sipil Fakultas Teknik Universitas Bangka Belitung, 6(2), pp. 88–96, 2018.
W. Restianingsih, S. Rasimeng, & R. Firdaus, "Pengolahan data Multichannel Analysis of Surface Wave ( MASW ) menggunakan perangkat lunak MASWaves studi kasus : Institut Teknologi Sumatera", Inst. Teknol. Sumatera, pp. 1–9, 2020.
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