National Gravity Compilation 2019: Complete Bouguer Anomalies Over Australia

A gravity anomaly image derived from the 2019 Australian National Gravity Grids A series. The grid is based on nearly 1.4 million ground gravity stations from the Australian National Gravity Database and offshore data, with station spacing ranging from less than 1 km to 11 km. Data collection spans from the 1940s to 2019, processed and quality-checked by Geoscience Australia geophysicists.

Use Cases

• Modeling subsurface geological structures based on gravity anomaly data.
• Resource exploration targeting based on density variations in the Earth's crust.
• Integrating gravity data with other geophysical surveys for comprehensive geological interpretation.
• Studying continental margin geology using combined onshore and offshore gravity observations.

Strengths

• Based on nearly 1.4 million gravity stations from a national database.
• Data collection spans a long temporal range from the 1940s to 2019.
• Grid has a fine cell size of approximately 435 meters (0.00417 degrees).
• Incorporates both onshore topography and offshore bathymetry for terrain corrections.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• Data may reflect geographic and temporal bias inherent to the aggregation of historical surveys.

Provenance

Source

Geoscience Australia, Commonwealth/State/Territory Governments, mining industry, universities, and research organizations.

Collection Method

Ground and airborne gravity surveys, processed via standard methods and quality-checked by GA geophysicists.

Time Range

1940s to 2019

Freshness

Last updated 2026-06-27 20:48:52.362192; freshness should be verified.

Geography

Australia and its continental margins