[en] This study aims to assess the site effect of the Bukit Timah Granite area in Singa-pore via 2D dynamic numerical modeling and further comparison with previous geophysical testing results. A 3D geophysical model was created via combining geophysical investigation data with borehole data and geological maps of the region, and then several 2D geological cross-sections were extracted. Those cross-sections were used for dynamic numerical modeling of seismic ground motion and for calculating site amplification using the Universal Distinct Element Code (UDEC). The results show that the fundamental frequency (f0) is in a good agreement between dynamic numerical modeling and horizontal to vertical spectral ratio (HVSR). Thus, the dynamic numerical models would be used for site effect analysis in the seismic hazard assessment.
Abdialim, S., Hakimov, F., Kim, J., Ku, T. & Moon, S.-W. 2021. Seismic site classification from HVSR data using the Rayleigh wave ellipticity inversion: A case study in Singapore. Earthquakes and Structures, 21, 231-238.
Hakimov, F., Domej, G., Ischuk, A., Reicherter, K., Cauchie, L. & Havenith, H.-B. 2021. Site Amplification Analysis of Dushanbe City Area, Tajikistan to Support Seismic Microzonation. Geosciences, 11, 154.
Havenith, H.-B., Strom, A., Calvetti, F. & Jongmans, D. 2003. Seismic triggering of landslides. Part B: Simulation of dynamic failure processes. Natural Hazards and Earth System Sciences, 3, 663-682.
Ku, T., Palanidoss, S., Zhang, Y. H., Moon, S. W., Wei, X., Huang, E. S., Kumarasamy, J. & Goh, K. H. 2021. Practical configured microtremor array measurements (MAMs) for the geological investigation of underground space. Underground Space, 6, 240-251.
Moon, S.-W., Hashash, Y. M. A. & Park, D. 2017. USGS hazard map compatible depth-dependent seismic site coefficients for the Upper Mississippi Embayment. KSCE Journal of Civil Engineering, 21, 220-231.
Moon, S.-W. & Ku, T. 2017. Estimation of bedrock locations and weathering degree using shear wave velocity-based approach. Proceedings of the 19th International Conference on Soil Mechanics and Geotechnical Engineering (ICSMG), Sept 17-22, 2017, Seoul, South Korea. Korea Geotechnical Society.
Moon, S.-W., Palanidoss, S., Zhang, Y., Ganapathiraman, V. & Ku, T. 2019. Bedrock depth evaluation using microtremor measurement: empirical guidelines at weathered granite formation in Singapore-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). Journal of Applied Geophysics, 171, 103866.
Sharma, J., Chu, J. & Zhao, J. 1999. Geological and geotechnical features of Singapore: an overview. Tunnelling and Underground Space Technology, 14, 419-431.
Wald, D. J. & Allen, T. I. 2007. Topographic slope as a proxy for seismic site conditions and amplification. Bulletin of the Seismological Society of America, 97, 1379-1395.
Zhang, Y., Li, Y. E., Zhang, H. & Ku, T. 2019. Near-surface site investigation by seismic interferometry using urban traffic noise in Singapore. Geophysics, 84, 1-43.
Zhao, J. 1996. Construction and utilization of rock caverns in Singapore .1. The Bukit Timah granite bedrock resource. Tunnelling and Underground Space Technology, 11, 65-72.