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

详细信息   

• 责任者：Cao Jingquan (Inner Mongolia Agriculture University ; Hohhot 010018 ; China) ; Liu Fang
• 刊名：Seismological Research of Northeast China
• 出版年：2008
• 卷期：24(1)
• 关键词：小震 ; small seisms ; 华北平原 ; Huabei Plain
• 页码：p.8-13
• 图表：3 illus., 3 tables, 5 refs.
• 分类号：0500
• issnNo：ISSN1004-2865
• isbnNo：CN21-1108/P

摘要

The variation of the major pressure stress axis of medium-small earthquakes in 2 years before 11 earthquakes with M_s≥5.0 and 1 year after 11 earthquakes with M_s≥5.0 nearby the focal region in the north area of North China compared with the background stress field was analyzed in this paper.The results showed that the major pressure stress axis appeared the deflection of 40°~90°, or the dip angle increased over 45°. This variation ended in 1 year after the main event.