摘要
通过对邢台地震极震区浅层探测、新生代深浅构造运动的分期、地壳上地幔结构特征剖析及其与震源参数的对比等研究 ,指出邢台地震区控制早第三纪盆岭构造发育的铲形断裂及其下部向东缓倾的滑脱面与邢台地震的发生无关 ;邢台地震群是在最新构造应力场作用下 ,受北西向断层或横向障碍体阻隔的不连续“深断裂”依次向上撕裂状破裂扩展、引起相邻斜列状深断裂间应力迁移和加载等三维破裂过程的产物 ;邢台地震断层是先存地壳“深断裂”向上撕裂状扩展的“新生断层”。
Through study of shallow seismic profiles across the epicenters of the Xingtai earthquakes,episodic grouping of the Cenozoic lithospheric structures,and comparison between the deep and shallow structures and earthquake focal parameters,based on the concept of new generation fault and pre\|existing fault,it is known that there is no Late Pleistocene\|holocene faults in the epicenters. The listric faults,that had controlled the Early Tertiary\|Miocene basin\|and\|range structure,and the eastward dipping detachment below did not play any role in earthquake breed or occurrence. The Xingtai earthquakes were resulted from upward tearing propagation of the concealed vertical fault in the middle and lower crust under the latest tectonic stress field,interaction between two neighbouring en\|echelon concealed faults,and then loading the neighbouring one to propagate also upward to induce another earthquake occurrence. The Xingtai earthquake faults are new generation ones that propagate upward from the concealed fualts in the middle and lower crust. The co\|seismic ground surface deformation is coupled with the focal slip during the earthquakes.
出处
《中国地震》
CSCD
北大核心
2000年第4期364-378,共15页
Earthquake Research in China
基金
中国地震局"九五"重点攻关项目! 95 0 4 0 8 0 2 0 2研究成果
