使用地面单台三分向地震记录资料评估场地效应方法的研究

STUDY ON METHOD EVALUATING SITE EFFECT USING THREE-COMPONENT SEISMOGRAMS OF SINGLE STATION ON SURFACE

摘要:

利用唐山强震观测台阵提供的井下和地面数字测震资料,研究了用单台地震记录评估场地效应的方法.利用井下基岩地震记录作参考台,用地面和井下的记录求取经验传递函数.同时应用Nakamura单台评估方法求解Nakamura谱比率.通过对比,证实了对场地效应的评估可以使用地面单台测震资料进行,不必参考基岩台的资料.因此,该方法是评估重要工程场地效应的一种简便可行的方法.使用该方法可以降低地震小区划的成本.

Abstract:

Single station site effect evaluation method is studied using seismograms obtained by strong motion observation array in Tangshan.Using rock station in bore hole as reference station, empirical transfer function is calculated with seismograms of both surface and borehole.Simultaneously, the Nakamura spectral ratio is calculated with surface seismograms.The results by the two ways are compared and it is confirmed that the single station method is encouraging.The method can be applied in site effect evaluation for important buildings as a simple, executable method.