Somme

Recorded Natural Hazards (Géorisques)

It has 771 municipalities and 565,413 inhabitants. Under the seismic zoning in force since 2011, its highest seismicity is low (zone 2 of 5). A natural disaster has been declared 2,709 times since 1982 (one declaration per municipality and decree), mostly for floods (1,816) and ground movements (860). The most recent was signed on 18 January 2026. 181 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 1999772 municipalities
• 1999Floods and Mudflows · 25 December 1999772 municipalities
• 2001Floods and Mudflows · 7 July 200162 municipalities
• 1992Floods and Mudflows · 28 May 199244 municipalities
• 1988Floods and Mudflows · 1 January 198842 municipalities
• 1993Floods and Mudflows · 15 December 199329 municipalities

Most Frequently Affected Municipalities

• 13Abbeville
• 13Amiens
• 11Épagne-Épagnette
• 11Fontaine-sur-Somme
• 11Picquigny
• 10Bray-sur-Somme
• 10Nampont
• 9Ault

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