When a great earthquake with magnitude of 7.8 struck the city of Tangshan on July 28, 1976, at least 655,000 people died and 780,000 more were injured.
2
这次唐山地震为里氏8级地震，里氏7.1级余震至少一天后才完，造成了大量人员死亡。
The Tangshan Earthquake registered about 8 on the Richter scale; an aftershock registering 7.1 occurred less than a day later, adding to the carnage.
3
并在此基础上以唐山7.8级地震为例，提出用方差检验的方法判别震前异常。
On the basis of the above-mentioned, the Tangshan M7.8 earthquake is used as an example to show how the anomalies are identified by the variance test method.
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