英文摘要
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The majority of the Tainan area is a densely populated alluvial plain. Medium- and high-story buildings are increasing. Considering that at least six active faults are distributed in this area, we can foresee a very high earthquake hazard potential. In this study, a catalog of 2041 shallow earthquakes which occurred from 1900 to 2010 with Mw magnitudes ranging from 5.0 to 8.2, and 11 disastrous earthquakes which occurred from 1683-1899 as well as three active faults are used to estimate the seismic hazard potential in the Tainan area for seismic microzonation. The results reveal that the highest earthquake hazard potential in the Tainan area is located in the northern part, including Houbi Dist., Xinying Dist., Liuying Dist., western Baihe Dist., western Liujia Dist., northeastern Yanshui Dist., northeastern Xiaying Dist., northern Guantian Dist. and northern Madou Dist. The probabilities of seismic intensity exceeding MMI VIII in 10, 30, and 50-year periods in above areas are greater than 40%, 80% and 90%, respectively. Moreover, the probability of seismic intensity exceeding MMI VI in 10-year period are greater than 90% in the central and northern areas of Tainan. Finally, by comparing with the seismic zoning map of Taiwan in the current building code that was revised after the 9/21 earthquakes, we find that the classification of the whole Tainan area zone I has underestimated the following areas: southern Houbi Dist., western Baihe Dist., western Tungshan Dist., central and eastern Liuying Dist., northern Liujia Dist. and northeastern Xinying Dist.. Results of this study show a high earthquake hazard potential in the Tainan area.
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