This paper could bring about an improvement of the analytic method for time-latitude residual. The correlation of residual anomalies with strong earthquakes has been made better, whth the result that false alarm rate hasbeen reduced. When anomalies of two methods have been synthetically studied, it can provide a lot more informations about distance and magnitude for earthquake predication. Results of time-latitude residual anomalies corresponding to all shocks of more than 5 magnitude, since 1983 have been given too. Finally, possible physical mechanism has been discussed.
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