Gray: geology and natural hazards

Natural and technological hazards to which the commune is exposed, according to the national GASPAR database.

• Inondation
• Mouvement de terrain: affaissements et effondrements d’origine anthropique (anciennes carrières souterraines, hors mines), tassements différentiels
• Séisme
• Affaissement minier

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

• Inondations et/ou coulées de boue: 9
• Sécheresse: 3
• Mouvement de terrain: 1

1. Sécheresse

   Event from 01/07/2020 to 30/09/2020, order published in the Journal officiel on 09/07/2021.

2. Sécheresse

   Event from 01/10/2018 to 31/12/2018, order published in the Journal officiel on 26/10/2019.

3. Inondations et/ou coulées de boue

   Event from 04/01/2018 to 07/01/2018, order published in the Journal officiel on 10/03/2018.

4. Sécheresse

   Event from 01/07/2003 to 30/09/2003, order published in the Journal officiel on 11/03/2006.

5. Inondations et/ou coulées de boue

   Event on 01/01/2002, order published in the Journal officiel on 28/03/2002.

6. Mouvement de terrain, Inondations et/ou coulées de boue

   Event from 25/12/1999 to 29/12/1999, order published in the Journal officiel on 30/12/1999.

7. Inondations et/ou coulées de boue

   Event from 06/08/1995 to 07/08/1995, order published in the Journal officiel on 15/10/1995.

8. Inondations et/ou coulées de boue

   Event from 05/02/1984 to 08/02/1984, order published in the Journal officiel on 24/05/1984.

9. Inondations et/ou coulées de boue

   Event from 16/05/1983 to 28/05/1983, order published in the Journal officiel on 26/07/1983.

10. Inondations et/ou coulées de boue

    Event from 08/12/1982 to 31/12/1982, order published in the Journal officiel on 13/01/1983.

11. Inondations et/ou coulées de boue

    Event on 09/11/1982, order published in the Journal officiel on 26/12/1982.

12. Inondations et/ou coulées de boue

    Event on 14/10/1982, order published in the Journal officiel on 26/12/1982.

Seismic zone

Zone 2 of 5: 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.

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

Recorded across the whole commune by BRGM, in its national databases of underground cavities and ground movements.

3 underground cavities recorded (quarries, cellars, military works, natural cavities…).

No ground movement recorded (landslides, rockfalls, collapses, mudflows…).

See cavities and ground movements on the map

• PPRN-I - Saône-partie 70

  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.

• Arc-lès-Gray (70)
• Gray-la-Ville (70)
• Velet (70)
• Ancier (70)
• Battrans (70)
• Rigny (70)
• Chargey-lès-Gray (70)
• Esmoulins (70)

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.