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STUDY ON THE LATE QUATERNARY KINEMATICS OF THE NORTHERNPN PIEDMONT FAULT OF THE LIULENG MOUNTAIN

Deng Qidong; Yonekura Nobuyuki (Institute of Geology, State Seismological (Department Of Geography, Gaduate School of Science, Bureau, Beijing 100029.China) Univetsity of Tokyo, Tokyo,113,Japan) Xu Xiwei;Yasuhiro Suzuke(Institute of Geology, Stale Se  
The northern piedmont fault of the Liuleng Mountain in the extentional region of the north-ern end of Shanxi graben system lies along the southern edge of Yangyuan basin and controls theorigin and development of the basin, It is a dip-slip normal fault, NEE-trending and N-dipping.Two moderate and large earthquake swarms (Ms=6.1, Ms=5.8) successively occurried alongthe fault in 1989 and 1991.The fault consists of a marginal faul of the basin (F_1)and a newly formed fault(F_2) cuttingthe late Pleistocene to Holocene alluvial deposits within the basin. The F_1 and F_2 faults form astepped fault zone along the northern piedmont and joint together into the western segment. Thefault activity is characterized by inheritant displacements. It cuts stream terraces of different agesand piedmont loess terraces, causing two basalt eruptions (K-Ar age of the basalt and TL age ofits underlying baked bed is 1.71±0.41Ma, 18.29±1.39~19.7±1.54×10~4a B.P. respective-ly). Later activity along the fault offset the basalt to form a 30~50m high scarp. At the middlesegment of the fault, F_1 has been inactive since late Pleistocene,whereas newly formed fault F_2 at2~3km north of the edge of the basin has offset alluvial fan surface and stream terraces of differ-ent ages since late Quaternary. The eastern segment of the fault cuts the third terrace at thejunction of Sanggan and Huliu rivers and formed a 50~60m high scarp.Several topographic profiles across the scarps on different segments and un-coeval geomor-phic surface were mapped to obtain vertical offset by using auto-level. Ages of the different geo-morphic surfaces were determined by TL and (14)~C. Average vertical slip rate is 0.43~0.75mm/aduring the late Pleistocene to the Holocene. The age of the youngest layer cut by the fault is 0.76~0.86×10~4a B. P.
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