论文部分内容阅读
通过华北断块区的地震活动、空间分布、地震断裂力学参数分析和剪切破裂带地震滑动速率及应力计算等研究了该地区现代构造断裂的动力学问题。基本结果如下: (1) 由地震活动及其分布所构成的深部地壳的现代断裂为一稳定的剪切破裂网络体系。 (2) 由震源机制资料得到本区地震断层多属走滑型和近走滑型,震源区主应力为水平力和近水平力。但斜滑型断层和倾滑型断层以及斜力和近垂直力也占有不可忽视的比例。 (3) 由地震矩估算出剪切破裂带的平均滑动速率均小于0.1厘米/年。 (4) 用中小地震估算本区地震构造力约为几十——几百巴量级。
Based on the seismic activity, spatial distribution, seismic fracture mechanics parameter analysis and the seismic slip rate and stress calculation of the shear-rupture zone in North China, the kinematic problems of the modern tectonic fracture have been studied. The basic results are as follows: (1) The modern fault in the deep crust formed by the seismic activity and its distribution is a stable shear fracture network. (2) It is found from the focal mechanism data that the seismic faults in this area are mostly of strike-slip and near-slip types, and the principal stress in the source area is horizontal force and near horizontal force. However, the sloping faults and the tilting-slip faults as well as the oblique and near-vertical forces also occupy a considerable proportion. (3) It is estimated from the seismic moment that the average slip rate of shear-fracture zone is less than 0.1 cm / year. (4) It is estimated that the seismic structural force in this area is about tens to hundreds of kilopascals with medium and small earthquakes.