Tsunami Hazard Assessments with Spatially Varying Tidal Planes

A study from the 2025 Australasian Coasts & Ports Conference presents a technique for modeling tsunamis with spatially varying Highest Astronomical Tide levels. The method is demonstrated using a case study of the Gladstone region in Australia, comparing probabilistic tsunami hazard assessments at three sites with different HAT levels. It uses nested grids with resolution down to 10 meters to resolve inundation.

Use Cases

• Compare tsunami inundation scenarios at different Highest Astronomical Tide levels for sites like Lady Elliot Island and Rosslyn Bay.
• Conduct probabilistic tsunami hazard assessments using four major earthquake source zones and importance sampling.
• Model tsunami propagation from earthquake sources to coastal regions using nested grids with 10-meter resolution.

Strengths

• Demonstrates method accuracy using a real-world case study in the Gladstone region of Australia.
• Compares probabilistic hazard assessments at three distinct sites with HAT levels ranging from 1.4 m to over 5.4 m.
• Uses nested computational grids with resolution as fine as 10 meters to resolve coastal inundation details.

Limitations

• Data is presented in a PDF format, not a structured, machine-readable dataset for direct analysis.
• The scope is a specific case study focused on northern Australia, limiting immediate geographic generalizability.
• Sample data and underlying simulation outputs are unavailable, restricting reproducibility and secondary use.

Provenance

Source

Geoscience Australia Data

Collection Method

Hydrodynamic tsunami modeling using nested grids and a proposed tidal adjustment technique.

Time Range

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Freshness

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Geography

Gladstone region and specific sites (Lady Elliot Island, South Trees, Rosslyn Bay) in Queensland, Australia.