Aisne

Recorded Natural Hazards (Géorisques)

It has 797 municipalities and 523,342 inhabitants. Under the seismic zoning in force since 2011, its highest seismicity is low (zone 2 of 5). A natural disaster has been declared 3,706 times since 1982 (one declaration per municipality and decree), mostly for floods (2,720) and ground movements (875). The most recent was signed on 8 July 2025. 356 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

• 1999Ground Movements · 25 December 1999800 municipalities
• 1999Floods and Mudflows · 25 December 1999800 municipalities
• 1993Floods and Mudflows · 17 December 1993213 municipalities
• 1995Floods and Mudflows · 17 January 1995149 municipalities
• 1983Floods and Mudflows · 23 June 198364 municipalities
• 1984Ground Movements · 22 November 198451 municipalities

Most Frequently Affected Municipalities

• 18Essômes-sur-Marne
• 17Château-Thierry
• 17Laon
• 15Origny-Sainte-Benoite
• 15Étréaupont
• 14Tergnier
• 13Saint-Michel
• 13Guise

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