【摘要】 以青海东部5个台站（湟源、西宁、乐都、大武、门源）十几年的地震观测资料为基础，分析震前地震波波速比、振幅比、S波衰减率、尾波持续时间的异常，并提取了异常指标为地震预报提供客观依据。更多还原

【Abstract】 On the basis of earthquake observation data beyond ten years recorded by five stations (Huangyuan, Xining, Ledu, Dawn and Menyuan) in the eastern Qinghai province,the authors have analysed the anomalies of Vp/Vs ratio,amplitude ratio S-wave attenuation rate and coda wave duration time,and got the anomalous index for earthquake prediction.更多还原