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1668年7月25日,在郯城、莒县间发生8.5级强烈地震。有称莒县大震,有称郯城大震,有称临沂大震。因震中不确切,也有笼统称之为鲁南大震的。由于对这次大震震中位置说法不一,大震名称也就各异。确定震中,对研究震源机制,划分烈度等方面有其重要意义。同时对推测本区未来地震危险段,也有重要参考价值。因此,对1668年这次大震震中作深入探讨很有必要。
On July 25, 1668, a strong 8.5-magnitude earthquake occurred in Gaocheng and Yixian counties. There are called Lixian earthquake, there is a large earthquake called Zhe City, there is a large earthquake called Linyi. Due to the epicenter of the imprecise, but also generally called the Lunan earthquake. Because of the location of the epicenter of this epicenter of different opinions, the name of the epicenter also varies. The determination of the epicenter is of great significance to the study of the focal mechanism and the division of intensity. In the meantime, it is also of important reference value for speculating the future earthquake danger zone in this area. Therefore, it is necessary to make in-depth discussions on the epicenter of this great earthquake in 1668.