In the analysis of seismic hazards of a particular region, the site response functions play a significant role. Site response functions for the central seismic gap become more important as the estimated possibility of manifestation of the earthquake (M ≥ 8) is 31% in a time window of fifty years (Khattri in Proc Indian Academy Sci Earth Planetary Sci 108(2): 87–92). This emphasizes the importance of analysis of seismic hazards in this region. The site effect or response functions have been assessed for the central seismic gap region in the present study using 87 recorded local events recorded at 50 sites located in the central seismic gap region of Himalaya. Among 50 stations, 9 stations are located in Higher Himalaya, 30 stations are situated in Lesser Himalaya, 06 stations are present in Sub-Himalaya, and the remaining 05 stations are situated in Indo-Gangetic plain. Here, the horizontal-to-vertical spectral ratio method has been used for evaluating the site response functions. The site response functions have been evaluated at different frequencies related to various types of structures. The estimated mean site response function value at the principal frequency (predominant) is found to be 6.2 for Higher Himalaya, 6.5 for Lesser Himalaya, 7.03 for Sub-Himalaya, and 9.6 for the stations located in the Indo-Gangetic plain. Further, the estimated site response functions and the station’s broad geology have been correlated with each other. With the help of estimated site response functions at various frequencies corresponding to various storey structures, the seismic hazard in the central seismic gap area has been discussed. The calculated site response functions are further useful for different studies like for simulation in strong ground motions and evaluating the earthquake source parameters.

在特定区域的地震灾害分析中，场地响应函数起着重要的作用。中央地震间隙的站点响应函数变得更加重要，因为在 50 年的时间窗口内，估计发生地震 (M ≥ 8) 的可能性为 31% (Khattri in Proc Indian Academy Sci Earth Planetary Sci 108(2)： 87-92）。这强调了分析该地区地震灾害的重要性。在本研究中，使用喜马拉雅中部地震间隙区域的 50 个站点记录的 87 个本地事件，对中心地震间隙区域的场址效应或响应函数进行了评估。在50个车站中，9个车站位于高喜马拉雅山，30个车站位于小喜马拉雅山，06个车站位于次喜马拉雅山，其余05站位于印度恒河平原。在这里，水平垂直谱比方法已被用于评估场地响应函数。已在与各种类型结构相关的不同频率下评估了场地响应函数。发现在主要频率（主要）的估计平均站点响应函数值为高喜马拉雅山为 6.2，小喜马拉雅山为 6.5，次喜马拉雅山为 7.03，位于印度恒河平原的台站为 9.6。此外，估计的站点响应函数和台站的广泛地质已经相互关联。借助与不同楼层结构相对应的不同频率下估计的场地响应函数，讨论了中心地震间隙区的地震危险性。