National Gravity Compilation 2019: First Vertical Derivative Grid of Australia

A gravity anomaly grid for Australia and its continental margins derived from nearly 1.4 million ground and marine observations. The grid has a cell size of approximately 435 meters and shows the first vertical derivative of de-trended global isostatic residual anomalies. Data originates from the Australian National Gravity Database as of September 2019, supplemented by global marine data, with ground observations collected by various entities from the 1940s onward.

Use Cases

• Map subsurface geological structures based on gravity anomaly patterns.
• Support mineral and resource exploration by identifying density contrasts in the crust.
• Integrate with other geophysical data for regional geological modeling.
• Study isostatic compensation and crustal thickness variations across the Australian continent.

Strengths

• Derived from nearly 1.4 million gravity stations, providing dense spatial coverage.
• Grid cell size of approximately 435 meters offers high resolution for regional analysis.
• Incorporates data from multiple sources (government, industry, academia) collected over decades, from the 1940s to 2019.
• Processed using standard geophysical methods and quality-checked by geophysicists.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Ground station spacing varies from less than 1 km to 11 km, which may create uneven data density.
• Freshness should be verified; the underlying gravity database snapshot is from September 2019.

Provenance

Source

Australian Ocean Data Network, incorporating data from the Australian National Gravity Database and global marine grids.

Collection Method

Ground and marine gravity observations processed via standard geophysical methods, including isostatic correction and Fast Fourier Transform (FFT).

Time Range

Ground observations collected from the 1940s to 2019; database snapshot as of September 2019.

Freshness

Last updated 2026-06-27 15:51:45.880022; underlying data snapshot is from September 2019.

Geography

Australia and its continental margins.