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强震前震区附近天文台站时纬仪器的测时测纬残差同时或单独出现异常波动的现象,已为不少震例所证实。许多震例表明,在天文时纬台站周围大约300km范围内发生7级以上地震,或大约100km范围内发生6级以上地震时,一般在震前测时残差的五日均值会出现∽形的正负异常波动,或测纬残差的五日均值出现单峰异常波动(以超过两倍标准偏差者为异
Abnormal fluctuations in the measured latitude and longitude of the astronomical observatory at the astronomical station near the strong earthquake before and after the latitude and longitude measurement have been confirmed by many earthquake cases. Many earthquakes show that when earthquakes of magnitude 7 or above occurred within about 300km around the weft station in astronomical times or earthquakes of magnitude 6 or above occurred in a distance of about 100km, the average of the five-day residuals of the residuals measured before the earthquake may appear cascades Positive or negative anomalous fluctuations, or the five-day mean residual error of the surveyed monomorphic anomalous fluctuations (with more than twice the standard deviation were different