Seismic microzonation maps for Guwahati metropolitan area are presented based on the Uniform-Hazard-Spectrum (UHS) methodology. UHS method satisfies the performance-based design (PBD) criteria, which are based on two sets of spectral amplitudes, one for which the structure will remain linear, and the other for which it may undergo nonlinear response. The UHS method also considers contributions from large distant earthquakes and includes simultaneously the effects of site geology and of site soils. The maps presented include in a balanced way the effects of near and distant large earthquakes, spatial distribution of seismic activity, the site geology and site soil properties. The results also show that scaling design spectra by peak acceleration to which a standard spectral shape is anchored is not conservative.

基于统一危险谱（UHS）方法，绘制了瓜瓦哈蒂市区的微区划图。UHS方法满足基于性能的设计（PBD）标准，该标准基于两组频谱幅度，其中一组将保持线性，而另一组可能会经历非线性响应。UHS方法还考虑了远距离地震的贡献，并且同时包括了场地地质和场地土壤的影响。所提供的地图以平衡的方式包括了近距离和远距离大地震的影响，地震活动的空间分布，场地地质和场地土壤特性。结果还表明，通过将标准光谱形状固定到其上的峰值加速度来缩放设计光谱并不保守。