Analysis of Seismic Ground Response in Makassar Using Geotechnical In Situ Tests

Abstract:

This paper presents the analysis of seismic ground response of Makassar, the capital city of South Sulawesi Province in Indonesia, by employing an equivalent linear approximation of non-linear response technique. In this way, in-situ geotechnical tests were undertaken to obtain soil mechanics properties and establish shear wave velocity profiles by using CPT and SPT based empirical correlation formulas. Acceleration time histories model, which is considered to be able to propagate similar maximum credible earthquake, was used for input motion in computing seismic ground response of typical deep sediment in Makassar. Our findings suggested that seismic wave travels from bedrock to surface would be amplified at range of 0.124g to 0.349g with amplification factor of 1.14 to 5.54. Response spectral acceleration is found at range of 0.315g to 1.501g with the frequency of 7.69 Hz to 20 Hz. The southern areas of the city would propagate a high seismic amplification, while the eastern areas would yield low amplification. This is due to typical deep sediment seated on the southern areas is a thick clay overlying stiff sand. This would create impedance contrast, leading to reverberating a trapped seismic wave in between those two layers, and then producing high resonance at surface level. Deep sediment with interbedded clay and sand or interbedded sand and clay above bedrock would yield a larger seismic amplification than deep sediment with only clay dominated or sand dominated soil.

• Periodical: Applied Mechanics and Materials (Volume 845)
• Pages: 52-61
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.845.52
• Online since: July 2016
• Authors: Ardy Arsyad*, Akhmad Bakri Muhiddin, Ryan Rante, Abdul Rahman Djamaluddin, Ariningsih Suprapti
• Keywords: Amplification Factor, Earthquake, EERA, Equivalent Linear Approximation of Non-Linear Response, Ground Acceleration, Makassar, Response Spectral Acceleration

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