LOCAL GRAVITY-ANOMALY AND GEOTECTONICS IN THE DHARAMSALA-PALAMPUR AREA, NORTHWEST HIMALAYA

Gravity survey in the station spacing of about 2 km was carried out in Dharamsala-Palampur area (36 x 20 km) of the northwest Himalaya to st udy the seismotectonics of the region. The regional trend of Bouguer a nomaly shows general decrease from -230 mGal to -250 mGal from south t o north. The present gravity survey in Dharamsala-Palampur area has br ought out some gravity highs trending transverse to the Himalayan tren d. The presence of gravity high zone in the central portion of the stu dy area near Yol may indicate either an anticlinal structure or emplac ement of denser material, from below, probably along the southeast dip ping transverse feature noticed in the area. Another gravity high is n oticed southwest of Palampur, also named as Paror anticline. The Bougu er anomaly map has helped to detect some transverse faults trending no rtheast-southwest and north-south i.e. oblique to the major thrust in the Dharamsala-Palampur region.