在震中区，纵波使地面上下颠动。
In Zhenzhong Qu, longitudinal wave to the ground moving from top to bottom Britain.
这些事实说明了大地震发生前震中区的地层已有变形。
These facts show that before the earthquakes, deformations of the earth crust in the epicentral regions had already occurred.
大震后在震中区测得的应力值比离震中较远处测得的应力值要低。
The absolute stress value determined within the epicentral region of a strong earthquake is usually less than that of the region outside it.
文末，用唐山震中区地下水位异常资料，讨论了与震源演化过程的关系。
Finally, the relationship between Tangshan groundwater level anomalies in epicentral area and focal evolution process is discussed.
震中区产生了规模较大的地面破裂带，其中有张性、压性和剪切等多种型式裂缝。
In the meizoseismal area, there appeared a large number of fissures and fractures, consisting of types of tension, compression and shear.
构造带的推覆构造特征很可能控制了地震震源深度、震中区与烈度区的不同位等特征。
The characters of the nappe structure may control the locations of the focus and epicenter as well as the other features.
地震前，震中区周围应力场发生转向，由正应力区变为负应力区，同时正应力的量值逐渐增大。
The stress field of periphery of the epicentral region transformed from positive stress into negative stress, and the value of the positive stress increased gradually before the earthquakes.
地震前，震中区周围应力场发生转向，由正应力区变为负应力区，同时正应力的量值逐渐增大。
The stress field of periphery of the epicentral region transformed from positive stress into negative stress, and the value of the positive stress increased gradually before the earthquakes.
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