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根据震源机制的研究,我国绝大多数的破坏性地震发生在介质比较脆性的上地壳中(可称为孕震层),其断层面比较陡直,且以平推错动为主。对于这种类型的震源,地震时其震中区的垂直形变应当是不显著的。然而实际上我国一般大地震时极震区和其附近都有大面积、大幅度的下沉,其下沉的幅度和范围不能完全用震后地下水的排
According to the study of focal mechanism, the vast majority of destructive earthquakes in China occur in the more brittle upper crust (which may be referred to as the seismogenic layer). The fault plane is relatively steep and is dominated by horizontal thrusting. For this type of source, the vertical deformation of the epicentral region during an earthquake should be insignificant. However, in fact, during the general earthquake in our country, there is a large area and a large subsidence in and near the earthquake area. The amplitude and range of its sinking can not be completely replaced by the row of post-earthquake groundwater