Mechanisms of sedimentary basin formation on active plate margins show enormous diversity reflecting complex tectonic processes. Clastic layers within a basin are an excellent recorder of long-term environmental changes and the mass balance on arc-trench systems. This book is aiming to elucidate the intriguing tectonics of an active margin based on authentic field geology. Recent quantum leaps in geophysical technique have provided us with three-dimensional views of the deep interior of sedimentary basins. To comprehensively understand the geodynamics, however, describing surface processes by...