Calvados

Recorded Natural Hazards (Géorisques)

It has 526 municipalities and 709,441 inhabitants. Under the seismic zoning in force since 2011, its highest seismicity is low (zone 2 of 5). A natural disaster has been declared 3,277 times since 1982 (one declaration per municipality and decree), mostly for floods (2,065) and ground movements (576). The most recent was signed on 18 May 2025. 63 municipalities have a high radon potential (category 3), home to 13% of inhabitants. 80 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

• 1987Storms · 15 October 1987528 municipalities
• 1999Ground Movements · 25 December 1999527 municipalities
• 1999Floods and Mudflows · 25 December 1999527 municipalities
• 1986Floods and Mudflows · 21 June 1986527 municipalities
• 1995Floods and Mudflows · 17 January 1995186 municipalities
• 1988Floods and Mudflows · 15 January 198843 municipalities

Most Frequently Affected Municipalities

• 21Mézidon Vallée d'Auge
• 19Trouville-sur-Mer
• 17Bayeux
• 17Caen
• 15Blonville-sur-Mer
• 15Ouistreham
• 15Villerville
• 14Lisieux

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