Analysis of Sediment Thickness Using the Horizontal to Vertical Spectral Ratio (HVSR) Method in the Hills Area of Moramo District
DOI:
https://doi.org/10.56099/jrgi.v6i01.29Keywords:
Sediment layer thickness, HVSR, Microtremor, Moramo District, Hill areaAbstract
This research aims to determine value of the thickness of sediment layer (h) and the type of soil layer in the hilly area of Moramo District. This research uses microtremor data obtained from the TDL-303S Seismometer at 15 points with a distance between points of 400 m–800 m and shear wave velocity values up to a depth of 30 m (Vs30) obtained from USGS website data. Microtremor data were analyzed using HVSR method with Geopsy 3.4.2 software to obtain the dominant frequency value. The shear wave velocity value was extracted using ArcGis 10.8 software to determine Vs30 value at each measurement point. The f0 and VS30 values are used to determine the sediment layer thickness (h). The analysis results show that sediment layer thickness range between 5,03 m–47,43 m. The distribution map of sediment layer thickness values shows that research area with high sediment layer thickness values is located in a small part of Ulusena Village and Watu Porambaa Village. So, these two areas are at greater risk of experiencing damage due to earthquakes. The type of soil layers based on soil classification by Kanai (1983) are classified into 4 types of soil with the research area being dominated by Type I soil, where this type is tertiary or older rock consisting of hard gravelly sandstone. Type I is located in Wonua Jaya Village, the western and southern parts of Sumbersari Village, the eastern part of Pudaria Jaya Village, as well as small parts of Watu Porambaa and Ulusena Village.
References
Arifin, S.S., Mulyatno, B.S., Marjiyono, & Setianegara, R., 2013, Penentuan Zona Rawan Guncangan Bencana Gempa Bumi Berdasarkan Analisis Nilai Amplifikasi HVSR Mikrotremor Dan Analisis Periode Dominan Daerah Liwa Dan Sekitarnya, Geofisika Eksplorasi, Vol 2, No 1, 30.
Asna, 2017, Pemetaan Daerah Rawan Bencana Gempabumi di Wilayah Sulawesi Tenggara Berdasarkan Nilai Percepatan Tanah Maksimum dengan Menggunakan Metode MC. Guirre R.K, Skripsi, UIN Alauddin Makassar, Makassar.
BPS Kabupaten Konawe Selatan, 2021, Kecamatan Moramo dalam Angka (Moramo Sub District in Figures), Andoolo, Konawe Selatan.
Effendi, A.Y., dan Hariyanto, T., 2016, Pembuatan Peta Daerah Rawan Bencana Tanah Longsor dengan Menggunakan Metode Fuzzy logic (Sudi Kasus: Kabupaten Probolinggo), Jurnal Teknik ITS, Vol. 5, No. 2.
Kanai, K., 1983, Seismology in Engineering. Tokyo University. Japan.
Mandiri, T.P., 2017, Sharing Knowledge Microseismic Method, PT. Andalan Tunas Mandiri, Semarang.
Maulana, A.R., dkk., 2019, Analisis Indeks Kerentanan Seismik dan Percepatan Tanah Maksimum Berdasarkan Model VS30 USGS di Kabupaten Kulonprogo, Prosiding Seminar Nasional Kebumian Ke-12, Universitas Gadjah Mada.
Nakamura, Y., 1989, A Method for Dynamic Characteristic Estimation of Subsurface using Microtremor on The Ground Surface, Q.R. of RTRI, Vol. 30, 32.
Nakamura, Y., 2000, Clear Identification of Fundamental Idea of Nakamura’s Technique and Its Applications, Roc XII World Conf. Eartquake Engineering N. Z. 2656.
Nakamura, Y., 2008, On The H/V Spectrum, Tokyo Institue of Technology, Japan.
Prabowo, U.N., Sehah dan Ferdiyan, A., 2021, Estimasi Ketebalan Lapisan Sedimen Permukaan Berdasarkan Pengukuran Mikrotremor di Pemalang Jawa Tengah, Jurnal Teras Fisika, Universitas Jenderal Soedirman, Vol. 4, No. 1.
Pramudyo, T., dkk., 2022, Karakterisasi Amblesan Tanah Berdasarkan Analisis Data Geoteknik dan Kedudukan Muka Air Tanah Daerah Semarang Utara, Provinsi Jawa Tengah, Jurnal Lingkungan dan Bencana Geologi, 156-171.
Prasisila, M., dkk., 2021, Klasifikasi Kelas Situs Tanah dengan Nilai VS30 di Kecamatan Muara Bangkahulu Kota Bengkulu Menggunakan Metode Multichannel Analysis of Surface Wave (MASW), Prosiding Seminar Nasional Fisika, 277-282.
Pratama, M.P., Hamimu, L., Manan, A., dan Puspitafuri, C., 2021, Estimasi Ketebalan Lapisan Sedimen Kawasan Perbukitam Kecamatan Wangi- Wangi Kabupaten Wakatobi Menggunakan Metode HVSR, Jurnal Rekayasa Geofisika Indonesia, Universitas Halu Oleo, Vol. 03, No. 02.
Roser, J. and Gosar, A., 2010, Determination of Vs30 for Seismic Ground Classification in the Ljubljana Area, Slovenia. Acta Geotechnica Slovenica. 7(1), pp. 61–76.
Sarah, D., dkk., 2014, Strategi Pengurangan Risiko Bencana Amblesan Tanah di Kota Semarang. Pusat Penelitian Geoteknologi LIPI, Bandung
Simandjuntak, T.O., Surono, dan Sukido, 1993, Peta Geologi Lembar Kolaka, Sulawesi, Pusat Penelitian dan Pengembangan Geologi, Bandung.
Sitorus, N.M.H., M.S. Purwanto, dan W. Utama, 2017, Estimasi Ketebalan Lapisan Sedimen dan Amplifikasi Desa Olak Alen Blitar Menggunakan Metode Mikrotremor HVSR, Jurnal Teknik ITS, Vol. 6, No. 2.
Sulistiawan, H., Supriyadi, dan Yulianti, I., 2016, Studi Ketebalan Lapisan Sedimen Daerah Kampus UNNES dengan Menggunakan Metode Mikroseismik, Research Gate, 45.
Sungkono dan Santosa, B.J., 2011, Karakteristik Kurva Horizontal to Vertical Spectral ratio: Kajian Literatur dan Permodelan, Jurnal Neutrino, Vol. 4, No. 1. Surono, 2012, Geologi Lengan Tenggara Sulawesi, Badan Geologi, Jakarta.
Surono, 2013, Geologi Lengan Tenggara, Badan Geologi Kementerian Energi dan Sumber Data Mineral, Bandung.
Syafitri, Y., Bahtiar, dan Didik, L.A., 2018, Analisis Pergeseran Lempeng Bumi yang Meningkatkan Potensi Terjadinya Gempa Bumi di Pulau Lombok, Jurnal Fisika dan Pendidikan Fisika, Universitas Islam Negeri Mataram, Vol. 3, No. 2.
Syahruddin, M.H., Aswad, S., Palullangan, E.F., Maria, dan Syamsuddin, 2014, Penentuan Profil Ketebalan Sedimen Lintasan Kota Makassar dengan Mikrotremor, Jurnal Fisika, Vol. 4, No. 1, 17.
Syahrul dan Purba, E.S., 2021, Studi Teknis Pemetaan Cadangan Bawah Permukaan Bijih Nikel Daerah Kabupaten Konawe Selatan, Jurnal Geologi Terapan, Universitas Sembilanbelas November, Vol. 03, No. 02.
Wangsadinata, W., 2006, Perencanaan Bangunan Tahan Gempa Berdasarkan SNI 1726-2002, Shortcourse HAKI 2006, Jakarta
Downloads
Published
How to Cite
Issue
Section
License
Copyright (c) 2024 Jurnal Rekayasa Geofisika Indonesia
This work is licensed under a Creative Commons Attribution 4.0 International License.
