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。
Empirical formulas between magnitude, anomalous area of the autocorrelation coefficients and epicentral distance for every station are statistically obtained.
统计得出了各台所对应的地震震级与自相关系数异常面积和震中距的经验公式。
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