When the 7.8 magnitude earthquake struck Tangshan at 3:42 a.

When the 7.8 magnitude earthquake struck Tangshan at 3:42 a.m.on July 28,over a million people lay sleeping,unaware of the disaster that was to befall them.As the earth began to shake,a few people who were awake had the forethought to dive under a table or other heavy piece of furniture,but most were asleep and did not have time.The entire earthquake lasted approximately 14 to 16 seconds.
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