大同盆地现今构造活动及地壳应力场特征  

Present Tectogenesis and Characteristics of Crustal Stress Field in Datong Basin

作　　者：刘巍[1] 孟雁英[1] 王赵丽[1] 

机构地区：[1]山西省地震局

出　　处：《山西地震》1995年第1期7-13,共7页Earthquake Research in Shanxi

摘　　要：大量震源机制结果推断出大同盆地现代地壳应力场的主压应力方向为ＮＥ－ＮＥＥ，仰角变化不定，主张应力方向为ＮＷ－ＮＮＷ，仰角很小的结论。这与区域构造应力场ＮＥ－ＮＥＥ向挤压作用的结果相符。另据大同－阳高６．１级、５．８级地震的震源机制结果得出，大同－阳高地震的孕震应力场与华北区域应力场相一致，而不是受本地局部小区域应力场的控制的结论。Based on numerous focal mechanism solutions,the pa per inferred that the principal compressive stressorientation of the recent crustal stress field in Datong basin is NE-NEE,and its ellvation is uncertain,theprincipal extensional stress orientation is NW-NNW, and its ellvation is verv little.These results are consis-tent with NE-NEE pinching action of the regional tectonic stress field.Based on the focal mechanismn solutionsof the M6.1 and the M5.8 Datong-Yanggao earthquakes,the conclljsion that the seismogenic stress field ofthe Datong-Yanggao earthquake is consistent with the North China regional stress field,the seismogenicstress field is not controled by the local small regiol1al stress field is obtained.

关 键 词：构造运动 应力场 地壳应力 大同盆地 

分 类 号：P553[天文地球—构造地质学]