3D Victoria Report 3 - Isostatic and decompensative correction of Victorian gravity data
 |
| |||||
Product description:Introduction Isostatic and decompensative corrections have been applied to the complete Bouguer Anomaly over Victoria and bordering regions in south-eastern Australia. The isostatic correction was carried out by Intrepid Geophysics on publicly available gravity data. The decompensative correction was carried out by GeoScience Victoria to further refine the isostatically corrected data, providing a better representation of the shallow crust. Standard gravity data reduction techniques were used to produce a complete Bouguer Anomaly, using a reduction density of 2.67 T/m3. The complete Bouguer Anomaly map images the gravity response from the whole crustal section, including variations in the Moho surface and lateral density variations in the upper mantle. The isostatic correction accounts for the assumed variations in the depth of the Moho, removing long-wavelength anomalies in the gravity field inversely related to topography. The decompensative correction accounts for the long-wavelength anomalies remaining in the Isostatic Residual Anomaly associated with lateral density variations within the lithosphere. The resulting Decompensative Anomaly is an enhanced representation of density inhomogenaities within the upper 15-20 km of the crust (Cordell et al., 1991). Download The downloadable version of this report is supplied in PDF format (3.1MB). ER Mapper grids of the gravity data are also available (ZIP 9.4MB, 32.8MB, 33.1MB and 31.5MB). Bibliographic reference FitzGerald, D., Paterson, R., & Skladzien, P.B., 2009. Isostatic and decompensative correction of Victorian gravity data. GeoScience Victoria 3D Victoria Report 3. Department of Primary Industries. | ||||||
