The 145-km-long, southeast-dipping and normal-faulting with dextral slip Luoyunshan frontal fault zone controls the western edge of NE-trending Linfen Basin which locates at the southwestern part of the Shanxi fault-depression system.Two historic strong earthquakes successively occurred in the Linfen Basin:the A.D.1695 Linfen M7W1/2 and the A.D.1303 Hongdong M8 earthquakes. The research indicates that tectonic geomorphologic scarps with heights of 2.5 m±, 5.2 m± and 8 m±, respectively, present continually on these alluvial fanheads;the terraces T1 of gully around Longci are dated to be about 7 500 aB.P.; terraces with heights of 3.5 m±, 8 m±, 18 m± above the gully base, respectively.