National Gravity Compilation 2019 DGIR 1VD Image

A processed gravity image grid representing the first vertical derivative of de-trended global isostatic residual anomalies over Australia and its continental margins. The grid has a cell size of 0.00417 degrees (approximately 435m) and is derived from nearly 1.4 million gravity stations from the Australian National Gravity Database and marine data. It was produced by Geoscience Australia from data acquired by government, industry, and research organizations from the 1940s to 2019.

Use Cases

• Interpret subsurface geological structure based on gravity anomalies.
• Analyze continental margin geology using processed marine gravity data.
• Support mineral exploration by mapping density variations in the Earth's crust.
• Validate geological models using a national-scale gravity compilation.

Strengths

• Grid derived from nearly 1.4 million gravity observations, providing high data density.
• Station spacing varies from 11 km to less than 1 km, with major parts of the continent between 2.5 and 7 km.
• Data quality checked by GA geophysicists to ensure fitness-for-purpose.
• Incorporates offshore data from a global gravity grid developed by Scripps, NOAA, and NGA.

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 / Geoscience Australia

Collection Method

Processed from ground observations in the Australian National Gravity Database and supplemented by offshore data.

Time Range

Data acquired from the 1940s to September 2019.

Freshness

Last updated 2026-04-16 15:50:54.211472; freshness should be verified.

Geography

Australia and its continental margins.