Abstract:In this paper, it is found that power spectrum of earth tremor corresponds to acceleration peak value and response spectrum of ground motion using comparison analyses between the practical data on the seismic microzoning of Xining City, where the basic intensity is 7 degrees, and profiles of borehole is well. Therefore, in this context, the earth tremor can indicate the engineering-geology properties of Quaternary overburden layer under a certain site condition more directly, and the method of evaluating site by earth tremor may be regarded as a simple, convenient, and economic one of evaluating engineering site, used with other methods together.