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Gironde (33)

Mérignac: geology and natural hazards

What public services say about the ground beneath the commune (population 78,090) 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

Mérignac at a glance

Seismic zone
2 of 5 (low)
Radon potential
Category 1 of 3 (low potential)
Recognised natural disasters
37 since 1982
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.

  • Mouvement de terrain: tassements différentiels
  • Séisme
  • Feu de forêt

Recognised natural disasters

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

  • Inondations et/ou coulées de boue: 20
  • Sécheresse: 17
  • Chocs mécaniques liés à l’action des vagues: 2
  • Tempête: 2
  • Grêle: 1
  • Mouvement de terrain: 1

  1. Inondations et/ou coulées de boue

    Event from 17/06/2024 to 18/06/2024, order published in the Journal officiel on 02/08/2024.

  2. Sécheresse

    Event from 01/07/2022 to 30/09/2022, order published in the Journal officiel on 03/05/2023.

  3. Inondations et/ou coulées de boue

    Event from 17/06/2021 to 19/06/2021, order published in the Journal officiel on 02/07/2021.

  4. Sécheresse

    Event from 01/10/2018 to 31/12/2018, order published in the Journal officiel on 09/08/2019.

  5. Sécheresse

    Event from 01/01/2017 to 30/06/2017, order published in the Journal officiel on 20/10/2018.

  6. Inondations et/ou coulées de boue

    Event from 26/07/2013 to 27/07/2013, order published in the Journal officiel on 13/09/2013.

  7. Sécheresse

    Event from 01/01/2012 to 31/03/2012, order published in the Journal officiel on 02/08/2013.

  8. Inondations et/ou coulées de boue

    Event on 02/08/2011, order published in the Journal officiel on 01/12/2011.

  9. Sécheresse

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

  10. Sécheresse

    Event from 01/07/2010 to 30/09/2010, order published in the Journal officiel on 02/02/2012.

  11. Sécheresse

    Event from 01/07/2009 to 30/09/2009, order published in the Journal officiel on 13/01/2011.

  12. Inondations et/ou coulées de boue, Chocs mécaniques liés à l’action des vagues

    Event from 24/01/2009 to 27/01/2009, order published in the Journal officiel on 29/01/2009.

  13. Inondations et/ou coulées de boue

    Event on 31/05/2008, order published in the Journal officiel on 10/12/2008.

  14. Sécheresse

    Event from 01/07/2005 to 30/09/2005, order published in the Journal officiel on 22/02/2008.

  15. Sécheresse

    Event from 01/07/2003 to 30/09/2003, order published in the Journal officiel on 01/02/2005.

  16. Sécheresse

    Event from 01/01/2002 to 30/04/2002, order published in the Journal officiel on 22/05/2003.

  17. Inondations et/ou coulées de boue, Chocs mécaniques liés à l’action des vagues, Mouvement de terrain

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

  18. Inondations et/ou coulées de boue

    Event on 27/07/1999, order published in the Journal officiel on 26/02/2000.

  19. Sécheresse

    Event from 01/01/1997 to 31/12/1998, order published in the Journal officiel on 03/04/1999.

  20. Sécheresse

    Event from 01/10/1995 to 31/12/1996, order published in the Journal officiel on 16/11/1997.

  21. Sécheresse

    Event from 01/06/1995 to 30/09/1995, order published in the Journal officiel on 17/04/1996.

  22. Inondations et/ou coulées de boue

    Event from 24/12/1993 to 10/01/1994, order published in the Journal officiel on 29/04/1994.

  23. Inondations et/ou coulées de boue

    Event from 08/08/1992 to 09/08/1992, order published in the Journal officiel on 28/03/1993.

  24. Sécheresse

    Event from 01/01/1992 to 30/06/1992, order published in the Journal officiel on 03/09/1993.

  25. Sécheresse

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

  26. Inondations et/ou coulées de boue

    Event from 11/02/1990 to 15/02/1990, order published in the Journal officiel on 24/05/1990.

  27. Sécheresse

    Event from 01/01/1990 to 31/12/1990, order published in the Journal officiel on 17/04/1991.

  28. Sécheresse

    Event from 01/06/1989 to 31/12/1989, order published in the Journal officiel on 16/09/1990.

  29. Inondations et/ou coulées de boue

    Event on 01/09/1987, order published in the Journal officiel on 11/11/1987.

  30. Inondations et/ou coulées de boue

    Event from 23/09/1986 to 24/09/1986, order published in the Journal officiel on 14/02/1987.

  31. Inondations et/ou coulées de boue

    Event from 14/09/1986 to 15/09/1986, order published in the Journal officiel on 09/01/1987.

  32. Inondations et/ou coulées de boue

    Event from 25/04/1986 to 02/05/1986, order published in the Journal officiel on 03/08/1986.

  33. Inondations et/ou coulées de boue

    Event on 09/08/1983, order published in the Journal officiel on 08/10/1983.

  34. Inondations et/ou coulées de boue, Tempête, Grêle

    Event from 16/07/1983 to 24/07/1983, order published in the Journal officiel on 11/09/1983.

  35. Inondations et/ou coulées de boue

    Event from 16/07/1983 to 24/07/1983, order published in the Journal officiel on 08/10/1983.

  36. Inondations et/ou coulées de boue

    Event on 04/07/1983, order published in the Journal officiel on 08/10/1983.

  37. Inondations et/ou coulées de boue, Tempête

    Event from 06/11/1982 to 10/11/1982, order published in the Journal officiel on 02/12/1982.

Earthquakes and radon

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.

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

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 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.