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

Geoscience Australia's 2019 National Gravity Compilation project produced isostatic residual gravity anomaly grids for Australia. The grids were generated by Intrepid Geophysics using the Airy isostatic compensation method, incorporating new elevation models and both Airy-derived and seismic-derived Moho depth grids. The project aimed to create a benchmark isostatic residual grid and supplementary products, with results tested against Geoscience Australia's 2016 and 2019 models.

Use Cases

• Modeling crustal thickness and density variations based on the isostatic residual gravity anomaly grids.
• Comparing different isostatic compensation methods using the Airy-derived and seismic-derived Moho depth products.
• Calibrating regional gravity surveys against the national benchmark grid mentioned in the description.
• Investigating geological structures by analyzing the de-trended global isostatic residual (DGIR) grid.

Strengths

• Produced by Geoscience Australia, a national geological survey.
• Includes grids derived from both Airy and seismic Moho models for comparison.
• Benchmark grid created as part of the 2019 National Gravity Compilation.
• Differences from previous GA models are typically less than a few um/s².

Limitations

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

Provenance

Source

Geoscience Australia, with processing by Intrepid Geophysics.

Collection Method

Generated using the Airy isostatic compensation method applied to the 2019 national Complete Bouguer Anomaly grid, with new elevation and Moho depth grids.

Time Range

Primary data from the 2019 National Gravity Compilation project.

Freshness

Last updated 2026-04-20 02:46:51.134184; freshness should be verified.

Geography

Australia