RESOLVING SOURCE PARAMETERS THROUGH PSEUDO POTENTIAL ANOMALIES

Ambiguity is inherent in the interpretation of all geopotential anomal ies. The ambiguity can possibly be reduced by generating pseudo potent ial anomalies and comparing them with the observed anomalies. A 0.25 d egrees digitized gravity anomaly data set of the Indian subcontinent a nd adjoining regions was used to generate a pseudo magnetic anomaly ma p at an altitude of 400 km. This map was compared with the MAGSAT scal ar anomaly map and there seems to be a good reproduction of MAGSAT map over the Himalayas. However, anomalies over east and west coasts show latitudinal shifts of about 2 degrees when compared to MAGSAT anomali es. The southern peninsular of India is characterized by strong negati ve Bouguer anomalies, possibly due to the bias of Indian ocean geoid l ow. The pattern of pseudo magnetic map as obtained from gravity data d iffers from that of MAGSAT suggesting different sources of gravity and magnetic anomalies over southern India. (C) 1998 Published by Elsevie r Science Ltd. All rights reserved.