震中区（epicentral area）是指发生地震时，震中及其附近的地方所在区域，也称极震区。
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.
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