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Savoie (73)

Modane: geology and natural hazards

What public services say about the ground beneath the commune (population 2,849) 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

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 à débordement lent de cours d’eau, par une crue torrentielle ou à montée rapide de cours d’eau
  • Mouvement de terrain: affaissements et effondrements d’origine naturelle (cavités souterraines), eboulement ou chutes de pierres et de blocs, glissement de terrain
  • Séisme
  • Avalanche
  • Phénomène lié à l’atmosphère: neige et pluies verglaçantes
  • Radon
  • Rupture de barrage
  • Transport de marchandises dangereuses
  • Engins de guerre
  • Affaissement minier: effondrements généralisés

Recognised natural disasters

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

  • Inondations et/ou coulées de boue: 11
  • Mouvement de terrain: 1
  • Tempête: 1

  1. Inondations et/ou coulées de boue

    Event from 29/06/2025 to 30/06/2025, order published in the Journal officiel on 16/07/2025.

  2. Inondations et/ou coulées de boue

    Event on 01/08/2014, order published in the Journal officiel on 04/10/2014.

  3. Inondations et/ou coulées de boue

    Event from 26/05/2008 to 30/05/2008, order published in the Journal officiel on 05/07/2008.

  4. Inondations et/ou coulées de boue

    Event from 14/10/2000 to 15/10/2000, order published in the Journal officiel on 29/12/2000.

  5. Inondations et/ou coulées de boue

    Event from 25/06/1994 to 26/06/1994, order published in the Journal officiel on 31/01/1995.

  6. Inondations et/ou coulées de boue

    Event from 24/09/1993 to 25/09/1993, order published in the Journal officiel on 12/10/1993.

  7. Inondations et/ou coulées de boue

    Event from 21/12/1991 to 24/12/1991, order published in the Journal officiel on 23/08/1992.

  8. Mouvement de terrain

    Event from 24/02/1991 to 25/02/1991, order published in the Journal officiel on 15/08/1992.

  9. Inondations et/ou coulées de boue

    Event from 14/02/1990 to 20/02/1990, order published in the Journal officiel on 24/05/1990.

  10. Inondations et/ou coulées de boue

    Event on 24/08/1987, order published in the Journal officiel on 11/11/1987.

  11. Inondations et/ou coulées de boue

    Event on 01/07/1987, order published in the Journal officiel on 09/10/1987.

  12. Inondations et/ou coulées de boue, Tempête

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

Earthquakes and radon

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.

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.

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

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

See cavities and ground movements on the map

Risk prevention plans

  • PPR Multi-Modane Révisant1

    Natural risk prevention plan, under revision.

  • PPRi-Maurienne Médiane

    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 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.