Their house, which was solidly built, resisted the main shock.
他们的房子修建得很坚固，经受住了主震。
It can happen with a month, or within days, from the main shock.
余震可以在主震发生后的一个月或者几天之内发生。
The NNE-SSW distributed aftershocks occurred on, or near, the fault plane of the main shock;
北北东—南南西向分布的余震发生在主震的断层面上（或其附近）；
The NNE-SSW distributed aftershocks occurred on, or near, the fault plane of the main shock;
北北东—南南西向分布的余震发生在主震的断层面上（或其附近）；
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