The absolute stress value determined within the epicentral region of a strong earthquake is usually less than that of the region outside it.
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 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。
Epicentral depositions and earthquake deformation zones provide useful information about focal region size.
震中拗陷与地震形变带提供了震源区大小的信息。
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