此后，发生了七次强烈余震，其中最弱的一次震级达到里氏7.0级，美国地质调查局报告说第一次余震达到了里氏7.5级。
Several powerful aftershocks later struck the same area, at least one with a magnitude of 7.0. The US Geological Survey earlier said the first quake was of a 7.5 magnitude.
我们称之为余震，有时比第一次地震更危险。
We call them aftershocks and they sometimes can be more dangerous than the first earthquake.
余震会在第一次地震距离多远的地方发生？
How far away from the first earthquake can aftershocks occur?
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