SEISMIC MICROZONATION OF SEMARANG, INDONESIA BASED ON SITE RESPONSE ANALYSIS USING 30 M SOIL DEPOSIT MODEL
DOI:
https://doi.org/10.11113/jt.v78.9607Keywords:
Seismic microzonation, site response analysis, seismometer, PGA, amplification factorAbstract
Seismic microzonation study of Semarang is still on-going following the recommendations from the Team for Revision of Seismic Hazard Maps of Indonesia 2010 (TRSHMI-2010). The study was performed by carrying one-dimensional site response analysis at 190 locations and implementing Lasem fault as a closest seimic source that significantly influence the hazard of the city. The analysis was performed using two soil deposit models, 30 m and real soil deposit models, to get ground surface peak acceleration (PGA) and amplification factor of PGA. The results obtained using the first model are then compared with the results obtained using the second model. To perform the analysis bedrock elevation and acceleration time histories data are needed. The bedrock elevation was estimated based on 218 single station seismometer measurements. Five different time histories representing different earthquakes with magnitude 6.5 MW and maximum distance 20 km are collected from worldwide historical earthquake records. The results of this study includes the distribution of surface PGA and amplification factor of PGA. The PGA and amplification factor calculated using 30 meter soil deposit model are greater than the same values calculated using real soil deposit model. Â
References
Asrurifak M. 2010. Peta Respon Spektra Indonesia Untuk Perencanaan Struktur Bangunan Tahan Gempa Dengan Model Sumber Gempa Tiga Dimensi Dalam Analisis Probabilitas, Disertasi Doktor Teknik Sipil, Institut Teknologi Bandung, xxviii + 283.
Irsyam M., Dangkua D.T., Hendriyawan, Hoedajanto D., Hutapea B.M., Kertapati E.K, Boen T and Petersen M.D. 2008. Proposed Seismic Hazard Maps of Sumatra and Java Islands and Microzonation Study of Jakarta City, Indonesia, J. Earth Syst. Sci. 117(2): 865-878.
Irsyam M., Sengara I.W., A
ldiamar F., Widiyantoro S., Triyoso W., Natawijaya D.H., Kertapati E., Meilano I., Suhardjono, Asrurifak M. dan Ridwan M. 2010. Summary: Development of Seismic Hazard Maps of Indonesia for Revision of Seismic Ringkasan Hasil Studi Tim Revisi Peta Gempa Indonesia 2010, 1 Juli, 2010, Bandung.
Newcomb K.R. and McCann W.R. 1987. Seismic History and Seismotectonics of the Sunda Arc., J. Geophys. Res. 92: 421-439.
Elnashai, A., Kim, S.,J., Yun G. J. dan Sidharta D. 2007. The Yogyakarta Earthquake of May 27, 2006, Mid-America Earthquake (MAE) Center Report. 7(2): 57.
Sukhyar, R. 2003. Status and Progress of Urban Geology In Indonesia, Atlas and Urban Geology Vol. 14: The Ground Beneath Our Feet: a Factorin Urban Planning, United Nations ESCAP (Economic and Social Commission for Asia and the Pacific), New York. 335 – 340.
Abidin H.Z., Andreas H., Gumilar I., Sidiq T.P., Gamal M., Murdohardono D., Supriyadi, Fukuda Y. 2010. Studying Land Subsidence in Semarang (Indonesia) Using Geodetic Methods, FIG Congress 2010, Facing the Challenges – Building the Capacity, Sydney, Australia, 11-16 April 2010.
Geological Research and Development Centre 1996, Geological Map of the Magelang and Semarang Sheets, Java.
Nakamura Y. 1989. A Method for Dynamic Characteristic Estimation of Subsurface Using Microtremor on The Ground Surface, Quarterly Report of Railway Technical Research Institute. 30: 25-33.
Claudet S.B., Baize S., Bonilla L.F., Thierry C.B., Pasten C., Campos J., Volant P. and Verdugo R. 2009. Site Effect Evaluation in the Basin of Santiago de Chile Using Ambient Noise Measurements, Geophys. J. Int, 2009. 176: 925-937.
Johansson J.A.T., Mahecha E.A.L., Acosta A.T.T. and Arellamo J.P.M. 2008. H/V Microtremor Measurements in Pisco, Peru after the 2007 August 15 Earthquake, The 14th World Conference on Earthquake Engineering, Beijing, China.
Ibs-von Seht, M. and Wohlenberg, J. 1999. Microtremors Measurements Used to Map Thickness of Soft Soil Sediments, Bulltin of the Seismological Society of America. 89: 250-259.
Parolai, S., Bormann, P., and Milkert, C. 2002. New Relationships Between vs, Thickness of Sediments, and Resonance Frequency Calculated by the H/V Ratio Seismic Noise for Cologne Area (Germany), Bulletin of the Seismological Society of America. 92: 2521-2527.
SNI 1726:2012. 2012. Tata Cara Perencanaan Struktur Bangunan Gedung dan Non Gedung SNI 1726:2012, ICS 91.120.25:91.080.01, Badan Standarisasi Nasional.
Partono, W. 2015. Pembuatan Peta Mikrozonasi Gempa Kota Semarang Melalui Pengembangan Program Seismic Hazard dengan Mempertimbangkan Kondisi Fragility Bangunan, Disertasi, Program Doktor Teknik Sipil, Diponegoro University. xxxi+315.
Osaki Y. dan Iwasaki R. 1973. On Dynamics Shear Moduli and Poisson’s Ratio of Soil Deposits, Soil and Foundations, JSSMFE. 13(4 Dec): 59-73.
Ohta Y. dan Goto N. 1978. Empirical Shear Wave Velocity Equation in Terms of Characteristic Soil Indexes, Earthquake Engineering and Structural Dynamics. 6: 167-187.
Imai, T. dan Tonouchi, K. 1982. Correlation of N-value with S-Wave Velocity and Shear Modulus, Proc. of Second European Symposium on Penetration Testing, Amsterdam, The Netherlands. 67-72.
Abrahamson, N.A. 1998. Non-Stationary Spectral Matching Program RSPMATCH>PG&E Internal Report, February.
Iwan, W.D. 1967. On a Class of Models for the Yielding Behaviour of Continuous and Composite Systems, Journal of Applied Mechanics, ASME. 34: 612-617.
Mroz, Z. 1967. On the Description of Anisotropic Workhardening, Journal of Mechanics and Physics of Solids. 15: 163-175.
Bardet, J.P. and Tobita, T. 2001. NERA A Computer Program for Nonlinear Earthquake Site Response Analysis of Layered Soil Deposits, Department of Civil Engineering University of Southern California.
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