SEISMIC GROUND RESPONSE ANALYSIS FOR LIQUEFACTION ASSESSMENT IN BUNAKEN, NORTH SULAWESI, INDONESIA

R E Majid ^1,2, F Faris¹^*, A Rifa’i¹

¹Department of Civil and Environmental Engineering, Faculty of Engineering, Universitas Gadjah Mada, Yogyakarta 55281, Indonesia

²PT Nindya Karya (Persero), Gedung Nindya, East Jakarta 13630, Indonesia

^1*Corresponding author: [email protected]

DOI: https://doi.org/10.20885/icsbe.vol4.art30

ABSTRACT

Bunaken Island is a quaternary deposit of Holocene age. Dominating sand layers, shallow groundwater table, and near active fault locations make the area highly susceptible to liquefaction. This study aims to determine the minimum ground acceleration that can potentially trigger liquefaction in the area. In this study, earthquakes originating in the North Sulawesi Thrust were modelled with various magnitudes. PGA was calculated using the attenuation function from : Liu and Tsai (2005), Abrahamson et al. (2016), Atkinson and Boore (2003), and Zhao et al. (2006). Each earthquake parameter was analyzed for its liquefaction potential using the simplified procedure by Idriss and Boulanger (2008), and then the minimum earthquake parameter value that can cause liquefaction was determined. The analyses show that the study site has the potential for liquefaction if more than Mw 5.8 earthquake occurs with a PGA value of above 0.17g. The BKN-BH02 borehole is the most critical point of the four boreholes made at the study site.

Keywords: seismic, ground response, liquefaction

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