Hautes-Alpes

Recorded Natural Hazards (Géorisques)

It has 162 municipalities and 143,467 inhabitants. Under the seismic zoning in force since 2011, 68 municipalities are in a medium or high seismicity zone (42% of inhabitants). A natural disaster has been declared 310 times since 1982 (one declaration per municipality and decree), mostly for floods (216) and ground movements (56). The most recent was signed on 22 June 2025. 28 municipalities have a high radon potential (category 3), home to 20% of inhabitants. 55 municipalities are covered by an approved natural hazard prevention plan.

Seismicity Zones

Number of municipalities in each zone of the regulatory seismic zoning (from 1, very low, to 5, high).

Natural Disasters Declared Since 1982

Declarations per five-year period.

Most Widespread Events

• 2023Floods and Mudflows · 1 December 202337 municipalities
• 1994Ground Movements · 6 January 199420 municipalities
• 1994Floods and Mudflows · 6 January 199420 municipalities
• 2008Floods and Mudflows · 29 May 200816 municipalities
• 2023Floods and Mudflows · 19 October 202310 municipalities

Most Frequently Affected Municipalities

• 12La Grave
• 10Gap
• 8L'Argentière-la-Bessée
• 7Névache
• 7Rosans
• 6Abriès-Ristolas
• 6Briançon
• 6Val-des-Prés

Hazards Listed by Municipality

Number of municipalities exposed to each natural hazard according to the departmental major risks file.

Hazards at a specific address on Géorisques