Free-air and Bouguer Gravity Anomaly Maps of Australia at 1:25 Million Scale

Australia is covered by two geophysical maps at a 1:25,000,000 scale. The maps show free-air gravity anomalies and Bouguer anomalies on land with free-air anomalies at sea. They were prepared by Geoscience Australia from a data bank used for the 1976 Gravity Map of Australia, with additional marine observations filling a gap near the Great Barrier Reef.

Use Cases

• Analyze regional geological structures based on free-air gravity anomalies.
• Model subsurface density variations based on Bouguer gravity anomalies on land.
• Integrate marine gravity data based on observations from the 'Gulf Rex' vessel.
• Compare gravity data with geological features based on the map's overlay design for the 1976 Geological Map of Australia.

Strengths

• Maps are derived from the same data bank as the authoritative 1:5 million 1976 Gravity Map of Australia.
• Includes supplemental marine observations that fill a large data gap at the southern end of the Great Barrier Reef.
• Projection and preparation details are documented in a referenced scientific publication (Anfiloff et al.).

Limitations

• Description metadata is limited; actual data quality requires manual inspection after download.
• Column-level documentation is absent; field semantics must be inferred after download.
• The underlying data and map production date from 1976, which may limit relevance for contemporary high-resolution studies.

Provenance

Source

Geoscience Australia Data

Collection Method

Prepared from a gravity data bank with additional marine observations.

Freshness

Last updated 2026-05-14 04:24:10.443255; freshness should be verified.

Geography

Australia and surrounding marine areas