Terrain correction correction Tasmania – results and implications

The terrain correction is a critical component of the complete Bouguer anomaly in Tasmania. New terrain correction values for the entire Tasmanian onshore gravity database have been recalculated using automatic methods. An improved Statewide digital elevation model was produced for this purpose. The magnitude of the terrain correction adjustment ranges as high as 23 mGal, with the average approximately 2 mGal. The size of this change is such that significant alterations to extant gravity models are indicated.