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则木河断裂带南北分别与安宁河断裂带和小江断裂带相接,自中更新世复活以来,以左旋走滑为主,并成为一条重要的地震断层.据TL和ESR测年分析,则木河谷地广泛存在的最低一级冲积扇为10 000～15000年以来形成.切割这些冲积扇的冲沟被则木河断裂带错断,其发生时间与冲积扇相当或者更新,平均位移值测量为86m.据此计算,则木河断裂带晚更新世以来的平均走滑速率为5.8～8.6mm/a.“,”Since the Zemuhe fault rejuvenated as the transition, fault between the Anninghe fault and the Xiaojiang fault about in the Middle Pleistocene, it was dominated by strong left lateral slip and became an important earthquake fault. The lowest alluvial fan tableland, which developed widespread in the Zemuhe valley, is estimated to be 10 000～15 000 years BP based on thermoluminescene and 14C dating results. Several faulted streams, which cut the surface of the lowest tableland and should be younger than or as old as the lowest tableland, are selected to be landform feature for determining the net tectonic displacement on the Zemuhe fault and were surveyed. The average displacement of these streams was measured to be 86m.Therefore, the average lateral slip rate of Zernuhe fault in the Late Pleistocene is calculated to be 5.8～8.6mm/a.