从地形变资料探讨丽江7.0级地震的前兆特征  

STUDY ON THE PRECURSORY CHARACTERISTICS OF THE M7 LIJIANG EARTHQUAKE FROM THE CRUSTAL DEFORMATION DATA

作　　者：周友华 童迎世 肖海 

机构地区：[1]湖南省地震局

出　　处：《地震研究》1999年第1期17-25,共9页Journal of Seismological Research

基　　金：湖南省地震局资助

摘　　要：讨论了地震孕育发生的物理机制是“拉疏隆起———压缩凹陷”模式的形成机理及其特征；根据这一理性认识，应用丽江７０级地震之前滇西地区的地形变资料，较确切地得出了本区有强震发生，并且可以认定孕震体是在丽江至玉龙雪山东麓地区；根据发震前夕所观测到孕震体的“拉疏隆起—压缩凹陷”的区域大小与幅度值及岩层的弹性应变。In this paper, discussion is made on form and features of the physical mechanism of seismogenesis,“compressed cave-tensed uplift”. Based on above understanding and using the deformation data of western Yunnan before the M 7 Lijiang earthquake, we have acurately concluded that there would be a strong earthquake in this region and seismogenic block would be within the region from Lijiang to the east foot of Yulong Snow Mountain. According to the size and amplitude of“compressed cave-tensed uplift”and the elastic strain of rock stratum in the seismogenic block observed before the earthquake, the magnitude can be approximately calculated.

关 键 词：垂直差异运动 拉疏隆起 临震预报 地震前兆 

分 类 号：P315.7[天文地球—地震学]