Journal of the Korean Society of Mineral and Energy Resources Engineers ISSN:2288-0291(Print) 2288-2790(Online) 한국자원공학회지

A study was made on the gravity anomaly data over the Gyeongsang basin area to provide information on near surface features. The methods for analysis include the bouguer anomaly and its upward continuation, first-vertical derivatives and gradients of horizontal amplitude. The general characteristics of bouguer anomaly over the Gyeongsang basin is that the east and south-east coastal area emerged higher anomaly, while the Youngnam massive area appear to be lower anomaly. This may be related to structural movements that the east block of Yangsan fault was lifted relative to the west or by the east sea spreeding, the block changes its facies sudden to mafic toward the east. The higher density of sediments relative to granite in the study area enabled us to discriminate density variations due to granite by the methods, particularly of the vertical derivatives and horizontal amplitude gradients. The granite of the study area shows mainly of density variations of NNW trending.