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;

youdao

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;

youdao