On the side of Chiufen'erh Mountain facing the epicenter, rock strata were pulled apart and shifted several hundred meters while remaining in parallel to one another. On the side away from the epicenter, the rock strata were exposed, leaving nowhere for plants to grow. Below the mountain, the rubble covers 180 hectares and has blocked runoff from the mountain, forming two barrier lakes, Chiutsai Lake and Shetze-ken Lake.
九份二山逆向坡岩層撕裂開，平行位移數百公尺；順向坡整個岩層外露，難生草木；坍塌地則高達一百八十公頃，並且因山區水流，在填平的谷地形成「韭菜湖」與「澀仔坑湖」兩個堰塞湖。