The absolute stress value determined within the epicentralregion 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。
2
The stress field of periphery of the epicentralregion 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。
3
Epicentral depositions and earthquake deformation zones provide useful information about focal region size.