HHT analysis of structural earthquake response records;

Prediction of borehole stability by seismic records;

Optimum weighted stacking of seismic record with irregular noises;

According to seismic wave dynamic mechanics, the reasonable nonlinear mapping relationship between seismic record and logging data has been established.

Fractal and chaotic characteristics of seismic data;

In this paper a seismic multi scale edge detection (SMED) technique is proposed for detecting those variances from seismic data.

This paper discusses three methods for the signal-to-noise ratio estimation of seismic records,and they are SVD method,statistical averaging method and frequency-domain estimation method,respectively.

According to the site condition,the fortified intensity,the duration,and the fitting degree between the response spectra of seismic records and those of the code,this paper presents one way of selecting seismic records for time history analysis method.

Noise elimination is a necessary,there are all kinds of coherent noise on seismic records because of many reasons caused by shooting,propagation and receiving of seismic wave.