The main quake was estimated at magnitude 6.6.

据估计主震区的震级有6.6级.

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Main shock has passed, there should be a lot of small aftershocks of it.

主震过去了, 应该还有很多大小不一的余震吧.

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And there were only a very few aftershocks in the conductive lower crust.

因此,无论从竖向分层还是从横向非均匀性上看,唐山主震及其大多数余震都与高阻上地壳密切相关.

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The casualties from strong aftershocks and successive earthquakes are lower than that from mainshock.

强余震和后续强震的人口伤亡比主震轻.

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