NSW Geophysics Isostatic Bouger Gravity

This dataset is part of the Geological Survey NSW Geophysics dataset series.Isostatic spherical-cap Bouguer gravity data. The image is a pseudocolour layer with a histogram-equalised colour stretch. Cooler colours indicate lower values and warmer colours represent increasingly higher Bouguer gravity values. The image shows the Earth’s gravity response to variations in the crustal rock density, after removal of broad gravity highs and lows caused by changes in crustal thickness. Gravity data are presented after removal of latitude and 'free-air' corrections, Bouguer corrections (assuming a crustal density of 2.67 T/m3) and subtraction of gravity due to a model of the isostatic response to changes in elevation. The hue-saturation-intensity image was prepared by applying a 3x3 sun filter using an algorithm developed by NSW Trade & Investment. Sun illumination has been applied at 65 degrees elevation and 90 degrees azimuth.