台灣西南部（嘉義台南）活動變形與地形景觀的演化調查：階段1:台灣地區岩石表面光螢光定年試驗之機會

The piedmont and foreland basin of fold-and-thrust belts commonly concentratehuman population, infrastructures and economic centers, that are hence exposedto seismic hazards. To better live with these hazards, it is important to betterunderstand the three-dimensional structure of fold-and-thrust belts, their seismicbehavior and their evolution, from the crustal deformation and surface processespoints of view.This project offers to investigate the seismogenic structures at the WesternFoothills of the Chia-Yi-Tainan area, and, in the process, to implement a newlydeveloped Quaternary dating method. The study area undergoes about 30 mm/yrof westward shortening across a 45 km wide zone. Our final objective is toestimate the seismic potential of the active structures by determining theirgeometry and slip rates or shortening rates. This is classically achieved byanalyzing the morphology of Late Pleistocene sediments that recorded faultingand/or folding, by dating these strain markers, and by interpreting surface andsubsurface geology as a structural kinematic model. Using DEMs at 5 m and 20m resolution, we propose a geomorphic analysis in two parts. First, we plan toanalyze the landscape morphology, in particular the drainage network, at thescale of the piedmont and foothills. Indeed, preliminary observations of thetopography suggest possible drainage reorganisations that may result from