Australian Isostatic Residual Gravity Grids Using 2019 Elevation and Seismic Moho Models

Geoscience Australia and Intrepid Geophysics produced isostatic residual gravity anomaly grids for Australia in 2019. The project used the 2019 national Complete Bouguer Anomaly grid and applied the Airy isostatic compensation method with new elevation and seismic-derived Moho grids. Comparisons show good similarity with Geoscience Australia's 2016 and 2019 models, with differences typically less than a few um/s2.

Use Cases

• Modeling crustal thickness and isostatic compensation based on the Airy method described.
• Comparing seismic-derived versus Airy-derived Moho depth models for regional analysis.
• Analyzing regional gravity anomalies for mineral or hydrocarbon exploration.
• Benchmarking new isostatic correction methodologies against established national grids.

Strengths

• Derived from the authoritative 2019 Geoscience Australia national Complete Bouguer Anomaly grid.
• Includes two distinct flow streams using Airy-derived and seismic-derived Moho depths.
• Tested and compared against Geoscience Australia's 2016 and 2019 isostatic models.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• The seismic-derived Moho depth-based model is described as sub-optimal, requiring further analysis.

Provenance

Source

Geoscience Australia and Intrepid Geophysics, via the Australian Ocean Data Network.

Collection Method

Modeling using the Airy isostatic compensation method applied to gravity and elevation data.

Time Range

2019

Freshness

Last updated 2026-04-10 17:26:04.631395; freshness should be verified.

Geography

Australia