摘要
利用中、强震震源机制资料和区域小震平均解给出了中国东北地区地壳应力场的分布。由多个震源机制的平均结果得到,东北南部地区(42°30’以南)主压应力方向为NE70°。东北中部地区(吉林省和黑龙江省东南部)主压应力方向近似NE100°,它与深源地震震源机制解P轴一致,可能该区应力场分布受深源地震影响,东北北部地区(黑龙江省和内蒙北部)主压应力方向为NE58°。东北地区浅源地震震源机制解P轴仰角大多数小于30°,表明该区以水平应力为主。由震源机制结果也讨论了中国东北地区地震断层活动状况。
The distribution of crust stress field in the northeastern region of China was reported in
this paper. It was obtained from the mean mechanism solutions of some earthquakes in which
the directions of principal compressive stresses are NE70°in the south part, NE100°in the
middle part and NE58°in the north part of northeastern region. Most of elevation angles of
P and T axes of mechanisms of shallow earthquakes are less than 30°degree. It represents
that the horizontal compressive stress plaies dominant role for occurring of earthquakes in
the Northeastern region of China. The slip condition of faults in the area was also discussed
based on the results of mechanisms of earthquake focuses.
出处
《防灾减灾学报》
1992年第2期27-32,共6页
Journal of Disaster Prevention And Reduction
关键词
震源机制解
地壳应力场
东北地区
mechanism of carthquake focus
principal compressive stress
