抄録
This paper describes the results of a trenching study at the Tsautun area across the Chelungpu Fault that reptured during the 1999 Chichi earthquake. The deformation by the 1999 earthquake is recorded on both north and south walls of the trench as an eastern-side-up flexural scarp, which is 1.5 m in vertical slip, associated with an overriding of hanging wall on foot wall, 1-1.5 m. Complex folding is appeared on the south wall, where fine overbank deposit is thicker than the north wall. Faulting prior to the 1999 event is not found at this site, but is estimated to be older than 300 to 500 yr BP, judging from the 14C ages of the oldest age of deformed sediment.
