Anisotropy of Magnetic Susceptibility (AMS) analysis for sedimentation tracing of Selorejo reservoir

Abstract

We use the Anisotropy of Magnetic Susceptibility (AMS) method to describe the source and mechanism of sedimentation process at the Selorejo reservoir. Six cores of sediment were collected by conventional coring process and sliced into sub samples in order to trace the pattern of sedimentation in the horizontal section. Based on the average of magnetic susceptibility of each core we are able to distinguish the origin of sediment from the water input into the reservoir. Our result agrees with the SEM images of the magnetic mineral grains, extracted from the inputs. However, the data shows the size difference from those two inputs about one order of magnitude. The average layer-by-layer Eigen-values of the susceptibility in horizontal section are consistent, which also shows consistency of the sedimentation process along the vertical direction.