Australian Isostatic Gravity Residual Grids Using Elevation and Moho Models

Australia's gravity anomaly grids derived from the 2019 National Gravity Compilation. Geoscience Australia and Intrepid Geophysics produced these isostatic regional grids using the Airy compensation method with new elevation models and seismic-derived Moho grids. The project tested two flow streams, comparing results with Geoscience Australia's 2016 and 2019 models.

Use Cases

• Model crustal thickness variations based on the Airy isostatic compensation method described.
• Analyze regional gravity anomalies based on the de-trended global isostatic residual (DGIR) grid.
• Compare seismic-derived and Airy-derived Moho depth models as described in the project.
• Validate geophysical models using the benchmark isostatic residual gravity anomaly grid produced.

Strengths

• Grids are based on the 2019 GA national Complete Bouguer Anomaly (CBA) grid.
• Methodology includes both Airy-derived and seismic-derived Moho depth calculations.
• Comparisons show good similarities with GA's isostatic model, with differences typically less than a few um/s2.

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.
• Larger differences were observed for the seismic-derived Moho depth-based model, described as sub-optimal.

Provenance

Source

Geoscience Australia and Intrepid Geophysics

Collection Method

Airy isostatic compensation method applied to gravity data using digital terrain and Moho models.

Freshness

Last updated 2026-05-05 02:10:54.557969; freshness should be verified.

Geography

Australia