The preliminary conclusions are that the rift valley and landslip of Xionger mountain are the results of the 8(1/2) Tancheng earthquake in 1668 and they are the typical earthquake disaster relic.

• 初步认为，熊耳山裂谷及崩塌是1668年郯城八又二分之一级地震的产物，属典型的地震灾害遗迹。