丽江7级地震前高b值演化过程和孕震模式

EVOLUTION PROCESS OF HIGH B VALUE AND SEISMOGENIC MODE BEFORE THE LIJIANG M7 EARTHQUAKE

通过１９６５ 年以来云南省第Ⅲ、Ⅳ次强震活跃期间６－７ 级以上强震前一年云南地区ｂ 值全地域扫描图象的对比， 展示了丽江７ 级地震前高ｂ 值的动态演化过程， 并对照坚固体孕震模式和含硬包体试样在破裂孕育过程中声发射ｍ 值与杨氏模量Ｅ 的关系等实验结果， 以及高ｂ 值区和高波速区、余震区的关系， 均表明丽江地震的孕震区具备了坚固体孕震模式的高波速、高杨氏模量的特征。

It has shown the dynamic evolution process of high b value before the Lijiang M7 earthquake through the comparison of scanning patterns of b value one year before the M 6 7 earthquakes during the period of Ⅲ and Ⅳ since 1965. Comparing the test results between acoustic emission m value and Young′s modulus in the fracture process in the seismogenic modes of hard body and hard inclusion, considering the relations between high b value region and areas of high wave velocity and aftershocks, it is thought that there has a features of high wave velocity and high Yong′s modulus in seismogenic mode of hard body in the source area of Lijiang earthquake.