Drainage network and seismological analysis of active tectonics in Nanga Parbat Haramosh Massif, Pakistan

The Nanga Parbat Haramosh Massif (NPHM) is an active tectonic feature of the north-western Himalayas. The recent seismic activity lies on an active seismic zone between Sassi and Raikot, from north to south, and is called Raikot-Sassi fault zone. The drainage pattern of NPHM is disconnected at different location especially along the active Raikot-Sassi fault zone. The stream profile analysis of Indus River in the massif revealed four different locations of the active faults. The spatial distribution of geomorphic indices suggests that the western portion of the massif is more deformed compared to any other location. We observed variable relative uplift rates ranging from 7-13 mm yr^-1 in different locations with higher rates in the area along Raikot fault. The focal mechanism solutions (FMS) of recent events suggests that these active faults are strike slip with major thrust components. The correlation dimension values suggests that the events have failed to fill up the plane in the source zone. The heterogeneous drainage pattern, stream profile analysis and seismological characteristics suggest that the Raikot Fault zone is highly deformed and relates to strike slip dominated thrusting.