Abstract
A strong earthquake of 8.4 Mw occurred at the Sumatra Subduction Zone in September 12, 2007. The area that underwent the impact of the earthquake was located along the coastal area of the Bengkulu Province. A seismic ground response study was then performed with reference to the event. Several site investigations, including standard penetration test and shear wave velocity tests, were conducted to understand the subsoil condition. The data were used to analyze a ground response during the earthquake. The amplification factor of each site was obtained, and a comparison of the spectral accelerations was performed. The results showed that the study area could undergo an amplification factor ranging from 1.1 to 1.5 during the seismic wave propagation. The spectral acceleration that resulted from the seismic response analysis was also within the design value. The study results could generally bring awareness to local engineers to consider the seismic design value for the coastal area of the Bengkulu Province, particularly if a stronger earthquake happens in the future.
Bahasa Abstract
Analisis Respon Seismik di Sepanjang Area Pesisir Bengkulu selama Gempa September 2007. Pada tanggal 12 September 2007, gempa dahsyat berkekuatan 8,4 Mw terjadi di Zona Subduksi Sumatra. Salah satu area yang mengalami dampak dari gempa tersebut adalah pesisir pantai Provinsi Bengkulu. Mengacu pada kejadian tersebut, sebuah studi respon tanah seismik dilakukan. Beberapa investigasi lapangan yang terdiri dari uji SPT dan pengukuran gelombang geser dilakukan untuk memahami kondisi perlapisan tanah. Selanjutnya data yang yang peroleh tersebut digunakan untuk menganalisis respon lapisan tanah selama beban gempa tersebut. Faktor amplifikasi pada setiap lokasi dan perbandingan antara respon spectra dianalisis dalam studi ini. Hasil penelitian menunjukkan bahwa area penelitian dapat mengalami amplifikasi sebesar 1,1 sampai 1,5 kali selama perambatan gelombang seismik. spektra respon yang dihasilkan dari analisis respon seismik juga masih dalam batasan desain yang ditetapkan. Secara umum, hasil studi ini menekankan pada insinyur lokal untuk mempertimbangkan nilai desain yang dihasilkan untuk kawasan pesisir Provinsi Bengkulu, khususnya jika gempa besar terjadi di kemudian hari.
References
Earthquake Engineering Research Institute (EERI), Learning from Earthquakes Observation on the Southern Sumatra Earthquakes of September 12-13, 2007. EERI, Oakland, USA, 2007. http://eeri.org/ lfe/pdf/indonesai_south _sumatra_eeri_report.pdf
L.Z. Mase, Undergraduate Thesis, Department of Civil Engineering, Faculty of Engineering, University of Bengkulu, Indonesia, 2010. (Text in Indonesian).
L.Z. Mase, Teknosia. 15/2 (2016) 20.
R Misiniyati, Mawardi, Besperi, M.R Razali, R. Muktadir, Inersia. 5/2 (2013) 1. (in Indonesian).
A. Monalisa, Undergraduate Thesis, Department of Civil Engineering, Faculty of Engineering, University of Bengkulu, Indonesia, 2014. (in Indonesian).
L.Z. Mase, A.K Somantri, Potensi. 25/1 (2016) 1. (in Indonesian).
L.Z. Mase, A.K Somantri, Proceeding of Geo-technics National Seminar, Yogyakarta, Indonesia, 2016, p.81.
H.B. Seed, I.M. Idriss, Soil Mechanics. Found. ASCE. 97/SM9 (1971) 1249.
I.M. Idriss, R.W. Boulanger, Soil Dyn. Earthq. Eng. 26/1 (2006) 115.
SNI-1726-2002, Standard of Earthquake Resistance Design for Building Structures (Indonesian Seismic Design Code), Department of Public Works, Jakarta. Indonesia, 2012.
SNI-1726-2012, Standard of Earthquake Resistance Design for Building Structures (Indonesian Seismic Design Code) Indonesia Seismic Design Code, Standardization National Agency of Indonesia, Jakarta, Indonesia, 2012.
Centre of Earthquake Strong Motion Data (CESMD), Earthquake Ground Motion recorded at Sikuai Island Station-West Sumatra, Indonesia in 12/09/2007, CESMD, https://www.strongmotion center.org. 2017. (accessed on 13/04/ 2017).
National Earthquake Earthquake Hazard Reduction Program (NEHRP), Recommended Provisions for Seismic Regulation for New Buildings and Other Structures 1997 Edition, FEMA 302, Washington, USA, 1998.
.S. Iai, Y. Matsunaga, T. Kameoka, Soils Found. 32/2 (1992) 1.
.S. Iai, Y. Matsunaga, T. Kameoka, Soils Found. 32/2 (1992) 16.
.S. Sawada, O. Ozatsumi, S. Iai, Prooceeding of the 12th World Conference in Earthquake Engineering, Auckland, New Zealand, 2000, p.2486.
.R.R. Youngs, S-J. Chiou, W.J. Silva, J.R. Humprey, Seismol. Res. Lett. 68/1 (1997) 58.
.SeismoArtif, Artificial Ground Motion Program. Seismosoft company., downloaded from http://www.seismosoft.com. 2017.
.N. Yoshida, Seismic Ground Response Analysis, Springer, UK, 2015.
Recommended Citation
Mase, Lindung Zalbuin
(2018)
"Seismic Response Analysis along the Coastal Area of Bengkulu during the September 2007 Earthquake,"
Makara Journal of Technology: Vol. 22:
Iss.
1, Article 6.
DOI: 10.7454/mst.v22i1.3457
Available at:
https://scholarhub.ui.ac.id/mjt/vol22/iss1/6
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