丽江7级地震为何比预计发生的晚?——应力循环和地震

WHY THE LIJIANG M7 EARTHQUAKE CAME LATER THAN EXPECTED ——STRESS CYCLE AND EARTHQUAKE

用循环加载研究岩石破裂孕育过程中变形模量、纵波速度和声发射的变化特征，进而探讨认为丽江地区外部地震的发生使受力过程发生了变化， 从而使丽江７ 级地震延迟发生， 也使临近地震的前兆异常不明显或更复杂， 并使丽江地震震级减小。

It studies the variations of deformation modulus, P wave velocity and acoustic emission in the process of rock fracture by cycle loading. Further, it is considered that the occurrence of earthquake outside Lijiang seismic area made the forced process changed, therefore, the Lijiang M7 earthquake came later, the impending precursory anomalies became unclear or complicated, and the magnitude decreased.