基于噪声谱比法的内蒙古西部地区台站场地响应研究

Site Response of Western Inner Mongolia Stations Based on Noise Spectral Ratio Method

利用内蒙古西部12个台站的地脉动噪声数据,采用噪声谱比法研究台站的场地响应情况。分析表明,台站场地响应按曲线形态可分为3类,且可能受地形地貌、局部构造和台基状况等条件影响。对比分析噪声谱比法与Moya方法的场地响应结果发现,场地响应曲线形态基本一致,只有极少数台站存在明显差异。结果表明,内蒙古西部区域大部分台站的台基状况总体较好,场地响应曲线较为平坦,无明显频率放大点。

The microtremor noise data of 12 stations in western Inner Mongolia are used to calculate site response based on Nakamura noise spectral ratio method.The site responses of stations are classified into 3 categories according to the shape of site response curves.Site response is affected by topography,structure,base condition and so on.Comparing noise spectral ratio method with Moya method shows that the curve shapes of these two methods are basically consistent,only a few stations are significantly different.The results show most stations in western Inner Mongolia are in a good site platform situation,and site response curves are relatively flat,without obvious frequency amplification points.