Magnetic Anomaly Grid of the Australian Region

3,022,656 data points form the January 2002 edition of the first integrated onshore/offshore magnetic anomaly grid for the complete Australian margin. The grid covers 8°S to 52°S and 106°E to 172°E with a cell size of 0.01 degree, approximately 1 km, and values are in nanoTesla (nT). It was created by combining levelled and unlevelled marine data sectors with an earlier onshore grid, though mismatches exist at some onshore/offshore joins.

Use Cases

• Mapping subsurface geological structures based on magnetic anomaly variations.
• Mineral and petroleum exploration targeting using regional magnetic signatures.
• Integrating magnetic data with other geophysical datasets for continental-scale studies.
• Assessing crustal architecture and tectonic history of the Australian margin.

Strengths

• Represents the first integrated onshore/offshore magnetic grid for the complete Australian margin.
• Based on a substantial foundation of 3,022,656 individual marine data points.
• Provides specific geographic coordinates for both levelled and unlevelled data sectors.

Limitations

• Contains known mismatches at the joins between the onshore and offshore grids due to earlier development and merging processes.
• Metadata for columns, row count, size, license, and author is consistently listed as unknown or None across all platform entries.
• The core data is from 2002, with a stated 'last updated' metadata date in 2026, suggesting the underlying data may not be recent.

Provenance

Source

Geoscience Australia Data, with collaboration from Intrepid Geophysics (Melbourne, Australia) for the eastern sector levelling in 2000.

Collection Method

Marine data were levelled independently in three sectors and combined with an onshore grid; appropriate International Geomagnetic Reference Field (IGRF) models have been removed.

Time Range

Data represents the January 2002 edition.

Freshness

Last updated metadata: 2026-04-30 (data represents January 2002 edition).

Geography

Australian region from 8°S to 52°S and 106°E to 172°E, covering the complete Australian margin.