“海反退舍三十里”,出自倪长犀的《地震记》。1668年7月25日,郯城发生8.5级强烈地震(以下简称郯城大震)。他记述了郯城大震发生前后,以及震时赣榆所发生的宏观和震害情况。后来有关郯城大震的史料,多出自倪长犀的《地震记》。可是,现今在研究郯 “Sea back thirty homes”, from Ni long rhino “earthquake”. July 25, 1668, Tancheng 8.5 strong earthquake (hereinafter referred to Tancheng earthquake). He described the macro and seismic damage that occurred in Ganyu before and after the Daqu earthquake and in the earthquake. Later, the historical data about the Yuncheng earthquake was mostly from the “Earthquake” recorded by Ni. However, I am studying now