英语语法分析

The number above the beginning of each trace is the source azimuth and below is the epicentral distance.

每条轨迹起点上的数字是震源方位角与震源深度。

The faults of the strong aftershocks were traced from epicentral distribution of these smaller aftershocks.

强余震的断层是依靠这些小余震的震中分布来描绘的。

Finally, the relationship between Tangshan groundwater level anomalies in epicentral area and focal evolution process is discussed.

文末，用唐山震中区地下水位异常资料，讨论了与震源演化过程的关系。