尾波振幅比和能量比异常特征研究

利用中国数字地震台网（CDSN）兰州台记录的短周期数字地震资料，测定了尾波最大振幅与S波最大振幅之比r1、尾波能量与S波能量之比的平方根值r2随时间的变化。结果表明：在永登主震（19950和天祝-古浪主震（1996）前，r1和r2均出现上升或下降异常变化，且有较大的偏离平均值的异常高值或异常低值出现。

STUDY ON THE ANOMALOUS CHARACTERISTICS OF AMPLITUDE RATIO AND ENERGY RATIO OF CODE WAVES

Short period digital seismic data of Lanzhou seismic station in Chinese Digital Seismic Network (CDSN) are used to measured the changed with time for ratio r 1 (maximum amplitade of code wave with S wave) and the square root of ratio r 2 (coda energy with S energy).The results show that before Yongdeng earthquake in 1995 and Tianzhu-Gulang earthquake in 1996,the r 1 and r 2 have been increased or decreased and have anomalous high and low values that deviated average value.