After the Tangshan earthquake of 1976, strain adjustment took place in the earthquake source region by the occurrence of a series of aftershocks.
1976年唐山地震后，随着一系列余震的发生，震源区进行应变调整。
The largest earthquake worldwide during the past 200 years (magnitude 9.5 in May 1960) had a source region approximately 230 kilometers (140 miles) north of the February 27 quake.
在过去两百年中最大的地震（1960年5月9.5级地震）大约发生在此次2月27日地震以北230公里（140英里）处。
Seismic source faults are characterized by regional variation and may have different earthquake generating mechanisms for different region.
多震层内震源断层具有区域性特点，不同地区震源断层可能具有不同的孕震机制；
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