• 1. epicentral region: 震中区
• 2. tangshan epicentral region: 唐山地震区

• 1.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。
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• 2.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。
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• 3.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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