cf647cf5-9337-4bc8-bf5e-f3e8429f1b1d MinView Information Geological Survey of NSW minview.info@geoscience.nsw.gov.au 2026-05-18T13:58:42 ISO 19115:2003/19139 1.0 EPSG: 3308 Geothermal gradient 2024-07-25 1 Geothermal gradient model (2023) created by Geognostics with support from government and industry. The geothermal gradient describes how temperature increases with depth inside the Earth. It is expressed in degrees Celsius per kilometre (°C/km). The linear geothermal gradients are from the top of SEEBASE to the surface. These were calculated using the combined heat-flow contribution of multiple crustal heat sources including upper mantle, radiogenic upper crust, and sediment thickness. The highest calculated geothermal gradients are generally related to areas interpreted to be underlain by granitic intrusions in the basement. The composition and heat production characteristics of the granites are largely unconstrained by analyses Define a robust geological model and foundational dataset to improve understanding and management of NSW’s minerals, energy and groundwater resources. Email MinView Information Geological Survey of NSW minview.info@geoscience.nsw.gov.au https://geonetwork.geoscience.nsw.gov.au:/geonetwork/srv/api/records/cf647cf5-9337-4bc8-bf5e-f3e8429f1b1d/attachments/geothermal-geothermal-gradient.png 3D model NSW Geology NSW basement topography Geothermal gradient Temperature CC-BY-4.0 25000 geoscientificInformation 2024-08-13 2024-08-13 141.00 154.00 -37.60 -28.00 https://geophys-data.geoscience.nsw.gov.au/geothermal/images/nsw_geothermal_gradient.EPSG3857.tif WWW:DOWNLOAD-1.0-http--download Download GeoTIFF