Seine-Maritime (76)
Bellencombre: geology and natural hazards
What public services say about the ground beneath the commune (population 564) and the hazards it faces: natural disasters, earthquakes, radon, cavities, clays, groundwater and rocks.
Hazard names and other data are quoted as their producers publish them, in French.
Explore the commune on the map
Bellencombre at a glance
- Seismic zone
- 1 of 5 (very low)
- Radon potential
- Category 1 of 3 (low potential)
- Recognised natural disasters
- 6 since 1987
- Underground cavities recorded
- None
- Ground movements recorded
- None
- Risk prevention plans
- None
Hazards listed by the French State
Natural and technological hazards to which the commune is exposed, according to the national GASPAR database.
- Inondation: par une crue à débordement lent de cours d’eau, par ruissellement et coulée de boue, par remontées de nappes naturelles
- Mouvement de terrain: affaissements et effondrements d’origine anthropique (anciennes carrières souterraines, hors mines), affaissements et effondrements d’origine naturelle (cavités souterraines), tassements différentiels
- Transport de marchandises dangereuses
- Engins de guerre
Recognised natural disasters
6 events recognised as a natural disaster by ministerial order since 1987.
- Inondations et/ou coulées de boue: 5
- Chocs mécaniques liés à l’action des vagues: 1
- Inondations remontée nappe: 1
- Mouvement de terrain: 1
Inondations remontée nappe
Event from 23/04/2001 to 07/05/2001, order published in the Journal officiel on 26/09/2001.
Inondations et/ou coulées de boue, Mouvement de terrain, Chocs mécaniques liés à l’action des vagues
Event from 25/12/1999 to 29/12/1999, order published in the Journal officiel on 30/12/1999.
Inondations et/ou coulées de boue
Event on 06/06/1998, order published in the Journal officiel on 03/10/1998.
Inondations et/ou coulées de boue
Event from 17/01/1995 to 05/02/1995, order published in the Journal officiel on 06/05/1995.
Inondations et/ou coulées de boue
Event from 01/07/1993 to 02/07/1993, order published in the Journal officiel on 03/12/1993.
Inondations et/ou coulées de boue
Event on 01/09/1987, order published in the Journal officiel on 11/11/1987.
Earthquakes and radon
Seismic zone
Zone 1 of 5: very low. This regulatory zoning, in force since 2011, sets the rules for earthquake-resistant construction.
Radon potential
Category 1 of 3: low potential. The geological formations have the lowest uranium content. Radon is a naturally occurring radioactive gas that can build up in poorly ventilated rooms.
Beneath the town hall
What BRGM maps say at the town hall. They describe that single point: elsewhere in the commune, the ground may be quite different.
Shrink-swell clays
Rising groundwater
Underground cavities
Ground movements
Earthquakes
Nature of the ground
Cavities and ground movements
Recorded across the whole commune by BRGM, in its national databases of underground cavities and ground movements.
No underground cavity recorded (quarries, cellars, military works, natural cavities…).
No ground movement recorded (landslides, rockfalls, collapses, mudflows…).
Risk prevention plans
No risk prevention plan is listed for the commune.
Nearby communes
Sources and limitations
Listed hazards, natural disasters, seismic zoning, radon potential, cavities, ground movements and prevention plans: Géorisques, published by the French ministry for the ecological transition, under Licence Ouverte Etalab 2.0, data accessed on 02/11/2026. Summary beneath the town hall: BRGM map services, queried when the page is displayed. List of communes and populations: API Découpage administratif (geo.api.gouv.fr), d’après le code officiel géographique de l’Insee, version of 30/10/2026.
This information reflects the state of knowledge at the scale of the commune or of a single point. It replaces neither a soil survey nor the official risk statement (état des risques) required for a sale or a rental, which is drawn up on the official French government service.