Abstract: The scarps on the Mackay segment are divided into three groups based on the different amount of displacement and their topographic location. The three groups of scarps suggest three paleoearthquakes. The paleoearthquakes on the Mackay segment had magnitudes of about 7 based on comparing the amount of the displacement and length of scarps. Using the diffusion equation to model scarps on the Mackay segment, the age estimetes suggest that the recurrence interval of magnitud 7 earthquakes is about 5-11 Ka.

Key words: Idaho of United States, Lost river fault, Scarp, Profile measurement, Recurrence interval

摘要： 根据断层位错和地貌位置,麦凯段断层陡坎分为三组,它们是三次史前地震的产物。根据位错量和陡坎长度对比,史前地震的震级大约为7级。利用扩散方程模拟史前7级地震发生的重复时间间隔是5—11千年。

关键词: 美国爱达荷, 洛斯特河断层陡坎, 剖面测量, 重复时间间隔