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The geophysical mechanism behind astronomical time latitude residuals (ATLR) are discussed. The photoelectric astrolabe at Yunnan Observatory (YO) observed apparent synChronous anomalous ATLR before the Wenchuan M8.0 earthquake (EQ) in May 12, 2008 and the Lushan M7.0 EQ n April 20, 2013. We compared the ATLR from the YO photoelectric astrolabe and EQ data since 1976. Anomalous ATLR was observed before several strong EQs in the Yunnan Province. We believe the photoelectric astrolabe can be used to predict strong EQs and the anomalous ATLR are a potential EQ precursor.

本文介绍了天文时纬残差的定义，地震前天文时纬残差出现异常的研究现状，该异常可能的物理机制，以及2008年汶川8．0和2013年芦山7．0地震前云南天文台光电等高仪的时纬残差均出现同步异常。这与30余年的研究实践一致地表明，天文时纬残差震前异常是一种可能的地震前兆，它可以为仪器周围将发生的地震提前给出有价值的预测信息，值得重视和深入研究。