24154 – Geological Base

One of five Substrate components. Measures earthquake hazard from Geoscience Australia’s National Seismic Hazard Assessment (NSHA23) Peak Ground Acceleration at the 2%-in-50-year exceedance level — the standard rare-event design-level hazard measure. Inverted so 100 = most resilient (lowest PGA).

Source: GA NSHA23, nearest-neighbour grid join to each locality. A single continuous physical field, not sparse count data — no population floor logic is needed for this sub-node specifically, unlike the Census-derived branches.

A close to uniform spread across all ten deciles — expected for a continuous, rank-transformed percentile score with no hazard-flag sparsity, unlike this branch’s flood or catastrophe-history components. The five offshore territories excluded from the join are the only rows this node doesn’t score.

Alignment with the pillar. Across the 6,787 localities scored on both, this component and APN Substrate™ (Climate Resilience Rating) (24150) have a correlation of 0.69, on a scale where 1 means the two scores move together exactly and 0 means they are unrelated. The two are moderately aligned: a locality that scores high on this component tends to score above average on Substrate, with many exceptions. This component is one of the pillar’s five inputs, so part of that alignment is built into the pillar itself.

Each bar is the average locality score in that jurisdiction, with every locality counted equally regardless of population; the dashed line marks the national mean of 50.07. Queensland averages highest at 82.9 (1,492 localities) and the Australian Capital Territory lowest at 3.5 (102). Tasmania averages 75.9, New South Wales 50.8, Western Australia 39.8, the Northern Territory 35.4, Victoria 29.8 and South Australia 21.9. Other Territories (1 locality) are not shown.

The other four components of APN Substrate™ (Climate Resilience Rating) (24150).