Development of River Terrace at the Releasing Bend of the Sumatran Fault Zone near Ranau Lake, Southern Sumatra

Strike-slip fault system of Sumatran Fault Zone related with the genesa of lakes which growth in some area along the fault. Ranaulake with its peculiar rectangular shape are controlled by the evolution of the ancient Ranau releasing stepover. The shape of the lake is elongated to the present trace of Sumatran Fault Zone. One of the common geomorphic markers at the strike-slip fault system is the releasing bend that indicate the thinning part of the landforms. We would like to reveal the mechanism in developing the river terraces. In this study we extracting the DEM-SRTM datasets with 30m resolution into profile that show the elevation changing of river terraces in Way Rekuk stream near the Ranau Lake. By using the profile of the landforms of the area, there are some information regarding the processes of the landforms which affected by the tectonic processes either the geomorphic erosion. The landform affected by the strike-slip fault system that initiate the vertical offset of the river terrace. Proceeding The 2nd International Conference and The 1st Joint Conference. Faculty of Geology Universitas Padjadjaran with Faculty of Science and Natural Resources University Malaysia Sabah. Hal. 81-86