摘要
震源机制解和区域垂直形变资料表明,河西—祁连山中东部地区,存在着比较显著的垂直力源。大地电磁测深资料、弹性半无限空间内均匀膨胀球体地面垂直位移的反演表明,该区垂直力源主要起因于上地慢软流层的密度迅速增大和体积膨胀。最后根据断裂力学的观点,以门源6.4级地震立交孕震模式为例,讨论了垂直力源对地震的触发作用。
Focal--mechanism soltions and regional vertical deformation data show that there is a existence of very marked vertical force in middle and eastern part of Hexi--Qilian area. Telluric electro--magnetic sounding data and inversion solution of ground vertical deformation with a homogenous dilated sphere model in hemi--infinite elastic space show that the vertical force originates from rapid density increase and volum dilatation of upper mantle of asthenospere. Based on the view point of fracture mechanics, taking Menyuan 6.4 earthquake as a example, the trigger action of vertical force to earthquake is discussed in the paper.
出处
《地壳形变与地震》
CSCD
1993年第4期57-63,共7页
Crustal Deformation and Earthquake
关键词
垂直形变
地壳形变
地震成因
vertical force
vertical deformation
trigger action
