National Gravity Compilation 2019: First Vertical Derivative Image of Australia

A 2019 compilation integrates nearly 1.4 million ground gravity stations from the Australian National Gravity Database and offshore data. The image shows the first vertical derivative of complete spherical cap Bouguer anomalies over Australia and its continental margins, derived from a grid with a cell size of approximately 435 meters. The underlying ground data was acquired by government, industry, and research organizations from the 1940s to the present day.

Use Cases

• Modeling subsurface geological structures based on gravity anomaly data.
• Mapping continental margin features based on the first vertical derivative of Bouguer anomalies.
• Supporting mineral and resource exploration based on interpreted density variations in the sub-surface.

Strengths

• Integrates nearly 1.4 million gravity stations from a national database.
• Grid cell size is 0.00417 degrees (approximately 435m), suggesting a detailed spatial resolution.
• Data collection spans from the 1940s to the present, providing a long temporal baseline.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.

Provenance

Source

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

Collection Method

Ground and marine gravity observations processed via standard methods, with terrain corrections applied using bathymetry and topography data.

Time Range

1940s to 2019 (for ground data compilation).

Freshness

Last updated 2026-06-23 03:33:27.262834; freshness should be verified.

Geography

Australia and its continental margins.