摘要
1966年3月22日邢台7.2级地震极震区的人工爆炸地震波场十分复杂。其运动学和动力学特征表明,沿人工爆炸测线地区的深处存在着许多深断裂,且将全测线切割成为五个块段,断裂面常延伸到莫霍界面和上地幔顶部的坚硬介质。极震区则为更特殊的块段结构。极震区人工爆炸地震波的视速度V^(*)、视周期T^(*)、界面速度V、介质对能量的吸收系数α^(*)均有异常的变化,是一个断裂错综分布,宽约10—20公里的破碎地带。7.2级地震震中区下面存在着两组深大断裂,且在此汇集。在震源深度附近的介质中,局部水平错动可达4公里左右,上地幔顶部在此隆起。
The seismic wave field of artificial explosions at the most destructive area of the Hsingtai earthquake,M=7.2,of March 22,196■was very complex.The kinematic and dynamic characteristics of the such seismic waves show that there exist along the profile many deep faults which cut the profile into five blocks,and the fault planes usually extend to the Mohorovicic discontinuity and to the solid medium of the upper mantle,while in the most destructive area the structure has a more spe-cific character.Here,the apparent velocity V^(*),the apparent period T^(*),the layer boundary velocity Vd,and the energy absorption coefficient a^(*)of the medium vary anomalously.It is a fracture zone of fault complex with a width of 10-20 km.Under the epicentral area of the earthquake,there exist two groups of deep and large faults,intersecting at this point.The local horizontal dislocation reaches about 4 km in the medium at the focal depth,where the upper mantle rises.
作者
滕吉文
王国正
刘道洪
邢纪润
梁文斗
徐世林
TENG JI-WEN;WANG GUO-CHENG;LIU DAO-HUNG;HSING JI-RUN;LIANG WEN-DOU;XU SHI-LIN
出处
《地球物理学报》
1975年第3期196-207,共12页
Chinese Journal of Geophysics
