摘要
20090819 Cao Jingquan(Inner Mongolia Agriculture University,Hohhot 010018, China);Liu Fang Variational Characteristics of the Major Pressure Stress Axis of the Medium Small Earthquake Nearby Focal Region before the Events with M_s≥5.0 in the North Area of North China(Seismological Research of Northeast China,ISSN 1004- 2865,CN21-1108/P,24(1),2008,p.8- 13,3 illus.,3 tables,5 refs.)
