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Abstract
[The Analysis of Shear Strain and Building Damage due to Earthquake at Gading Cempaka and Ratu Agung District in Bengkulu City]. The aims of this research are to: (1) determine and mapping the distribution of shear strain values, (2) correlate between shear strains with building damage Gading Cempaka and Ratu Agung caused by earthwuake at sub district in Bengkulu city. Microtremor data were taken at 108 observation points then analyzed using HVSR method to obtain amplification factor and dominant frequency values..The result showed that shear strain value of Gading Cempaka and Ratu Agung sub district in Bengkulu city are relatively heterogeneous although in the same geological formation type. The earthquake in 2007 is estimated to be 3.38% potential to deform the land surface in the form of fractures and settlements and 96, 62% potentially experience shocks due to waves and vibrations due to earthquake. The earthquake of 2000 estimated that almost the entire area of Gading Cempaka and Ratu Agung has the potential to experience shocks due to waves and vibrations due to earthquake that is equal to 97% while potentially liquefaction (ambles) occurs by 3%. The correlation between shear strain with the damage of buildings due to earthquake shows the relationship is directly proportional to the function y = 15267x + 26.219 with the coefficient of resgression of = 0.671.
Keywords: Earthquake; HVSR method; microtremor; shear strain.Article Details
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References
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References
DAFTAR PUSTAKA
Anastasi, A. dan Urbina, S. 1997. Psychological Testing Seventh Edition. United State: Pearson Prentice Hall.
Campbell, K.W., and Bozorgnia, Y. 2006. Campbell-Bozorgnia NGA Empirical Ground Motion Model for theAverage Horizontal Component of PGA,PGV, PGD and SA at Selected SpectralPeriods Ranging from 0.01– 10.0 Seconds(Version 1.1). California: Pacific Earthquake Engineering Research Center, College of Engineering, University of California, Berkeley.
BPS. 2008, Posisi Geografis Provinsi Bengkulu.
Edwiza, D. 2008. Pemetaan Percepatan Tanah Maksimum dan Intensitas Seismik Kota Padang Panjang Menggunakan Metode Kanai. Teknik A No. 29 Vol.2: UNPAD.
Farid, M. 2013. Pemetaan Percepatan Getaran Tanah Maksimum dan Kerentanan Seismik Akibat Gempa bumi untuk Mendukung Rencana Tata Ruang dan Wilayah (RTRW) Kota Bengkulu. Jurnal Ilmu Fisika Indonesia Vol. 1, No (D): 82-83.
Harlianto, B. 2013. Pemetaan Percepatan Getaran Tanah Maksimum, Indeks Kerentanan Seismik Tanah, Ground Shear Strain, dan Ketebalan Lapisan Sedimen Untuk Mitigasi Bencana Gempa bumi di Kabupaten Bengkulu Utara. [Tesis]. Yogyakarta: Universitas Gadjah Mada.
Huang H and Y. Tsen. 2002. Characteristics of soil liquefaction using H/V of microtremor in Yuan-Lin area, Taiwan. TAO, Vol. 13, No. 3, 325-338.
Isihara, K.. 1982. Evaluation of soil properteis for use in Earthquake Response Analysis. Proc. Int. Symp. On Numerical Model in Geomech, 237-259.
Lubis, A. M., Hashima, A. and Sato, T., 2012. Analysis of afterslip distribution following the 2007 September 12 southern Sumatra earthquake using poroelastic and viscoelastic media, Geophys. J. Int. doi: 10.1093/gji/ggs020.
Nakamura, Y. 2000. Clear Identification of Fundamental Idea of Nakamura’s Technique and Its Application. Proc XII World Conf. Earthquake Engineering. New Zealand, 2526.
Waluyo. 2002. Diktat Kuliah Seismologi. Yogyakarta: Program Studi Geofisika. UGM.