Abstract
Shear wave velocity (V s) and the fundamental site period of the subsurface condition are the primary parameters that affect seismic soil amplification in particular sites. Within the topmost layer of the soil, which measures 30 m, the average shear wave velocity V s30 is commonly used to build codes for site classification for the design of earthquake-resistant structures and to conduct microzonation studies. In this study, the development of a microzonation map for V s30 distribution, National Earthquake Hazard Reduction Program V s30 site classification, and a fundamental site period for Penang are presented. The multichannel analysis of surface wave (MASW) test was conducted for more than 50 sites with available borehole data to develop the microzonation maps. The ten selected V s profiles measured by MASW show a good correlation with the data obtained using empirical correlations in a previous study. The highest V s values were identified at the northeastern and southeastern parts of Penang Island, corresponding to the shallow bedrock and the outcrop zone. Conversely, the lowest V s values were found in the northwestern and southwestern parts of the Penang mainland owing to the thick layer of soft clay and silt deposits. The site period map shows the variation in site periods, with the highest value of 1.03 s at the western part of the Penang mainland and the lowest value of 0.02 s at the eastern part of the Penang Island. The microzonation maps developed in this study are vital to studies on seismic hazard and earthquake mitigation programs in Malaysia.
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Acknowledgments
This study was sponsored by the Postgraduate Research Grant Scheme provided by Universiti Sains Malaysia. The authors would like to extend their gratitude to the Ministry of Education of Malaysia for the permission to collect data from primary and secondary schools in the study area.
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Tan, C.G., Majid, T.A., Ariffin, K.S. et al. Seismic microzonation for Penang using geospatial contour mapping. Nat Hazards 73, 657–670 (2014). https://doi.org/10.1007/s11069-014-1093-8
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DOI: https://doi.org/10.1007/s11069-014-1093-8