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Alpes-Maritimes (06)

Bonson: geology and natural hazards

What public services say about the ground beneath the commune (population 740) 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

Bonson at a glance

Seismic zone
4 of 5 (medium)
Radon potential
Category 1 of 3 (low potential)
Recognised natural disasters
12 since 1982
Underground cavities recorded
None
Ground movements recorded
None
Risk prevention plans
4

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 torrentielle ou à montée rapide de cours d’eau
  • Mouvement de terrain: eboulement ou chutes de pierres et de blocs, glissement de terrain
  • Séisme
  • Feu de forêt

Recognised natural disasters

12 events recognised as a natural disaster by ministerial order since 1982.

  • Inondations et/ou coulées de boue: 7
  • Glissement de terrain: 2
  • Sécheresse: 2
  • Tempête: 1

  1. Inondations et/ou coulées de boue

    Event from 15/10/2024 to 19/10/2024, order published in the Journal officiel on 04/11/2024.

  2. Inondations et/ou coulées de boue

    Event from 19/10/2023 to 20/10/2023, order published in the Journal officiel on 03/11/2023.

  3. Sécheresse

    Event from 31/03/2023 to 29/06/2023, order published in the Journal officiel on 18/10/2024.

  4. Sécheresse

    Event from 01/01/2022 to 30/09/2022, order published in the Journal officiel on 04/10/2023.

  5. Inondations et/ou coulées de boue

    Event from 02/10/2020 to 03/10/2020, order published in the Journal officiel on 08/10/2020.

  6. Inondations et/ou coulées de boue

    Event from 05/11/2000 to 06/11/2000, order published in the Journal officiel on 29/12/2000.

  7. Inondations et/ou coulées de boue

    Event from 04/11/1994 to 06/11/1994, order published in the Journal officiel on 25/11/1994.

  8. Inondations et/ou coulées de boue

    Event from 06/01/1994 to 13/01/1994, order published in the Journal officiel on 29/04/1994.

  9. Glissement de terrain

    Event from 06/01/1994 to 11/01/1994, order published in the Journal officiel on 29/04/1994.

  10. Inondations et/ou coulées de boue

    Event from 05/10/1993 to 10/10/1993, order published in the Journal officiel on 24/10/1993.

  11. Glissement de terrain

    Event from 01/10/1993 to 31/10/1993, order published in the Journal officiel on 18/02/1994.

  12. Tempête

    Event from 06/11/1982 to 10/11/1982, order published in the Journal officiel on 22/12/1982.

Earthquakes and radon

Seismic zone

Zone 4 of 5: medium. 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…).

See cavities and ground movements on the map

Risk prevention plans

  • PPRN-I - basse vallée du Var 2011

    Natural risk prevention plan.

  • PPRN-IF - Bonson 2021

    Natural risk prevention plan.

  • PPRN-Mvt - Bonson 2010

    Natural risk prevention plan.

  • PPRN-IF - Bonson

    Natural risk prevention plan.

The zoning and regulations of each plan, which may prohibit or restrict building, can be consulted at the town hall and on Géorisques.

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 03/11/2026. 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.