Landslide

Landslide

On steep, unstable ground, heavy rain can trigger a slide that hits the site. A slide on the site's own ground damages the asset. A slide on a road, rail line or pipe nearby can cut the site off. Landslide prices both Property damage (% of asset value) and Business interruption (% of annual revenue).

What the map shows

• Today: the NASA landslide susceptibility class (0 none to 5 very high), carried onto a 90 m grid and set to 0 where the terrain is too flat for a slide to start (sheet).
• Projected: the map does not move. The susceptibility is fixed; the climate signal enters the loss through its rainfall trigger, which reads the extreme-precipitation data.

How the loss is computed

The engine reads the susceptibility class at the site's point. A class-to-loss table, scaled by the ground vulnerability of the site type and by a rainfall trigger, gives the damage state, and an activation rate turns it into an annual loss. Property damage prices a slide on the site's own ground. Business interruption prices a slide anywhere within 500 m of the site, with its own rate. The landslide tag is Proposal: the shape of the class-to-loss table is measured on the NASA Global Landslide Catalog, but its absolute level, the vulnerability tiers and the activation rate are Darwin's. See Damage functions: The geotechnical trio and Climate risks.

Sources

• NASA Global Landslide Susceptibility Map (Stanley & Kirschbaum 2017). Public domain (US Government work).
• Maximum terrain slope: GIRI / UNEP-GRID / CIMA / NGI. Licence not confirmed.
• Class-to-loss shape: NASA Global Landslide Catalog, in the Uzielli et al. (2008) V = I × S decomposition (Engineering Geology 102:251-256). NASA Global Landslide Catalog: Licence not confirmed.

Limits

• A screening layer, not a siting or engineering tool. It models where a slide can start, not how far it runs.
• Only rainfall triggers a slide here. Earthquake-triggered slides are not priced.
• The absolute loss level, the ground-vulnerability tiers and the activation frequency are posed, not measured.