Abstract: The latest active fault in the Tancheng—Lushan fault zone is distributed from Weifang to Jiashan, and the Anqiu—Juxian fault is one of the important active faults.Based on geological investigation, high density resistivity method and composite drilling section, we studies evidences of fault activity and distribution characteristics of fault gouge of the Dadian—Xiaodian segment of the Anqiu—Juxian fault. Field geological investigation finds that prune glutenite thrusted to the top of the holocene cultivated soil, and Gouge zone with some breccia existed between the two stratum, which was characterized by holocene activity. The high density resistivity method results show that difference of positional resistivity of faults is obvious. Stratum revealed by the composite drilling sections mainly contains the following: holocene cultivated soil, completely decomposed sandy mudstone, and Strong-weathered sandy mudstone, cataclastic rocks, fault gouge, as well as, medium weathered sandy mudstone. Dark grey gouge zone revealed by the holes of K1 and K2 inclinesto west with a dip angle of 74°and thickness of 13.9 m, which is consistent with the southern gouge zones in fault occurrence. In the working area, there are multiple folds, fracture zones and gouge zones and the fault is a holocene reverse fault.

Key words: The Tancheng—Lushan fault, Gouge, High density resistivity, Composite drilling