Olivet: geology and natural hazards

Seismic zone

1 of 5 (very low)

Radon potential

Category 1 of 3 (low potential)

Recognised natural disasters

20 since 1985

Underground cavities recorded

14

Ground movements recorded

14

Risk prevention plans

1

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
• Mouvement de terrain: affaissements et effondrements d’origine anthropique (anciennes carrières souterraines, hors mines), tassements différentiels
• Transport de marchandises dangereuses

20 events recognised as a natural disaster by ministerial order since 1985.

• Sécheresse: 10
• Mouvement de terrain: 6
• Inondations et/ou coulées de boue: 5

1. Mouvement de terrain

   Event on 12/09/2023, order published in the Journal officiel on 10/12/2023.

2. Mouvement de terrain

   Event on 19/12/2022, order published in the Journal officiel on 15/03/2023.

3. Mouvement de terrain

   Event on 03/08/2021, order published in the Journal officiel on 29/10/2022.

4. Mouvement de terrain

   Event on 31/03/2021, order published in the Journal officiel on 09/07/2021.

5. Mouvement de terrain

   Event on 17/11/2019, order published in the Journal officiel on 03/09/2020.

6. Sécheresse

   Event from 01/07/2019 to 30/09/2019, order published in the Journal officiel on 12/06/2020.

7. Sécheresse

   Event from 01/07/2018 to 31/12/2018, order published in the Journal officiel on 09/08/2019.

8. Inondations et/ou coulées de boue

   Event from 28/05/2016 to 05/06/2016, order published in the Journal officiel on 09/06/2016.

9. Inondations et/ou coulées de boue

   Event on 28/09/2013, order published in the Journal officiel on 02/02/2014.

10. Sécheresse

    Event from 01/04/2011 to 30/06/2011, order published in the Journal officiel on 17/07/2012.

11. Sécheresse

    Event from 01/01/2006 to 31/03/2006, order published in the Journal officiel on 04/04/2008.

12. 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.

13. Sécheresse

    Event from 01/01/1996 to 31/12/1997, order published in the Journal officiel on 29/07/1998.

14. Sécheresse

    Event from 01/10/1993 to 31/12/1995, order published in the Journal officiel on 17/10/1996.

15. Sécheresse

    Event from 01/01/1993 to 30/09/1993, order published in the Journal officiel on 09/07/1994.

16. Sécheresse

    Event from 01/01/1992 to 31/12/1992, order published in the Journal officiel on 07/02/1993.

17. Sécheresse

    Event from 01/01/1991 to 31/12/1991, order published in the Journal officiel on 17/10/1992.

18. Inondations et/ou coulées de boue

    Event on 30/09/1990, order published in the Journal officiel on 17/04/1991.

19. Sécheresse

    Event from 01/05/1989 to 31/12/1990, order published in the Journal officiel on 27/12/1991.

20. Inondations et/ou coulées de boue

    Event from 28/05/1985 to 29/05/1985, order published in the Journal officiel on 18/10/1985.

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.

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.

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

14 ground movements recorded (landslides, rockfalls, collapses, mudflows…).

See cavities and ground movements on the map

• Révision PPRi Val d’Orléans AO

  Natural risk prevention plan, under revision.

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

• Saint-Pryvé-Saint-Mesmin (45)
• Saint-Jean-le-Blanc (45)
• Orléans (45)
• Saint-Hilaire-Saint-Mesmin (45)
• Saint-Denis-en-Val (45)
• La Chapelle-Saint-Mesmin (45)
• Saint-Jean-de-la-Ruelle (45)
• Saint-Cyr-en-Val (45)

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.