Issoire: geology and natural hazards

Seismic zone

3 of 5 (moderate)

Radon potential

Category 3 of 3 (significant potential)

Recognised natural disasters

13 since 1982

Underground cavities recorded

2

Ground movements recorded

None

Risk prevention plans

2

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 une crue torrentielle ou à montée rapide de cours d’eau, par ruissellement et coulée de boue
• Mouvement de terrain: tassements différentiels
• Séisme
• Feu de forêt
• Phénomène lié à l’atmosphère: tempête et grains (vent)
• Radon
• Risque industriel: effet thermique, effet de surpression, effet toxique
• Rupture de barrage
• Transport de marchandises dangereuses

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

• Inondations et/ou coulées de boue: 7
• Sécheresse: 6
• Mouvement de terrain: 1
• Tempête: 1

1. Sécheresse

   Event from 01/01/2023 to 31/12/2023, order published in the Journal officiel on 02/07/2024.

2. Sécheresse

   Event from 01/10/2022 to 31/12/2022, order published in the Journal officiel on 10/06/2023.

3. Sécheresse

   Event from 01/04/2022 to 30/06/2022, order published in the Journal officiel on 10/06/2023.

4. Sécheresse

   Event from 01/04/2020 to 30/06/2020, order published in the Journal officiel on 06/06/2021.

5. Sécheresse

   Event from 01/01/2019 to 31/12/2019, order published in the Journal officiel on 12/06/2020.

6. Sécheresse

   Event from 01/07/2018 to 30/09/2018, order published in the Journal officiel on 09/08/2019.

7. Inondations et/ou coulées de boue

   Event on 03/11/2008, order published in the Journal officiel on 13/02/2009.

8. Inondations et/ou coulées de boue

   Event from 01/12/2003 to 05/12/2003, order published in the Journal officiel on 13/12/2003.

9. 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.

10. Inondations et/ou coulées de boue

    Event on 02/07/1999, order published in the Journal officiel on 04/12/1999.

11. 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.

12. Inondations et/ou coulées de boue

    Event from 09/06/1992 to 12/06/1992, order published in the Journal officiel on 27/02/1993.

13. Tempête, Inondations et/ou coulées de boue

    Event from 06/11/1982 to 10/11/1982, order published in the Journal officiel on 19/11/1982.

Seismic zone

Zone 3 of 5: moderate. This regulatory zoning, in force since 2011, sets the rules for earthquake-resistant construction.

Radon potential

Category 3 of 3: significant potential. At least part of the commune has higher-than-average 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.

2 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

• rev PPRi Val d’Allier Issoirien

  Natural risk prevention plan, under revision.

• PPRN-I Couze Pavin et ses affluents

  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.

• Orbeil (63)
• Parentignat (63)
• Perrier (63)
• Brenat (63)
• Varennes-sur-Usson (63)
• Saint-Yvoine (63)
• Aulhat-Flat (63)
• Bergonne (63)

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.