太原盆地的应力场特征

通过对太原盆地大量震源机制解资料的研究，揭示了该盆地的地壳应力场特征，认为其地壳应力场具有显著的局部小区域应力场特征，即以北西－北北西向水平拉张、北东－北东东向挤压作用为主，而震源类型多为走滑－近走滑，兼有一定的斜滑分量，指明该应力场控制着太原盆地的中小地震活动。得出太原盆地的平均应力场与华北区域应力场完全一致，太原盆地的地壳应力场及地震活动仍严格受华北区域应力场的作用与控制的结论。

Characteristics of Stress Field in Taiyuan Basin

Through the analysis of a number of focal-mechanism solution data in Taiyuan Basin,the Characteris-tics of the crustal stress field in the basin have been releasd.It is suggested that there is the characteristics ofalocal micro-regional stress field in the stress field of this basin, which NW-NNW direction is dominantin the horizontal extension,and NE-NEE direction in the compression;the focal style is strike slip-approx-imate strike slip with some dip-slip component.The moderate and minor earthquakes occur under the con-trol of the stress field.The conclusion that mean stress field of Taivuan Basin is well consistent with the re-gional stress field of North China,and the crustal stress field and seismicity of Taiyuan Basin are controlledby the regional stress field of North China is obtained.