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 models and both Airy-derived and seismic-derived Moho depth grids. Comparisons show differences between the new models and Geoscience Australia's 2016 and 2019 isostatic models are typically less than a few um/s².

Use Cases

• Modeling crustal thickness and isostatic compensation based on the Airy isostatic method described.
• Comparing gravity anomaly results from seismic-derived versus Airy-derived Moho depth models.
• Benchmarking new isostatic correction methodologies against Geoscience Australia's 2016 and 2019 models.

Strengths

• Derived from the authoritative 2019 Geoscience Australia national Complete Bouguer Anomaly grid.
• Includes two distinct model streams using Airy-derived and seismic-derived Moho depth calculations.
• Results were tested against Geoscience Australia's 2016 and 2019 isostatic models.

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 seismic-derived Moho depth-based model showed larger differences and is described as sub-optimal.

Provenance

Source

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

Collection Method

Processed from the 2019 national gravity grid using Intrepid's Isostatic Correction Tool and the Airy compensation method.

Time Range

2019

Freshness

Last updated 2026-06-05 07:21:12.559252; freshness should be verified.

Geography

Australia