关键词: 活动断裂, 第四纪, 六盘山

Abstract: New results of field investigations show that the eastern Liupanshan piedmond fault is an active reverse fault zone since late Quaternary. This fault zone can be divided into north,middle,and south three segments in the light of the changes of its strike,active ages and active natures. The north segment is dominated by left lateral strike slip,while the middle and the south segments are characterized by thrust movement. The active age of the north segment is youger than the south and larger horizontal dislocations occurred on the north. Such changes of fault activities since late Quaterary are associated with obstruction for the eastward slide of the Xihuashan Liupanshan block as well as the variation of the fault strike.

Key words: Active fault, Quaternary, Liupanshan