Integrated Fault Characterization Analysis in Lake Albert Area, Uganda

NE Lake Albert recent geology is characterized by tectonic influence, rift dynamics and lacustrine/riverine transition. This study focuses on integrated method to investigate fault characteristics on the field to determine whether observed faults are active, and the correct age of their activity. First, we evaluated geomorphic indicators along fault traces, such as river catchments and knickpoints developed by fault activity. Then, terraces and pediment surfaces were analysed and verified on the field to establish their correct age. As preliminary result, terraces proved to be of different ages, with older ones systematically occupying topographically higher grounds, progressively becoming younger towards lake shores. Thus, a re-evaluation of some wellbores top sediments led to the establishment of a paleo-shoreline for the Holocene Lake, undeformed, substantially different from the Pliocene ground level of several displaced terraces. Integrating the geomorphic, sedimentary and tectonic setting, it is now clear that Late Pliocene age deposits are displaced, with faults appearing to be active during much of the Pleistocene, but not during Holocene, labelling faults as inactive.