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Ardennes (08)

Semuy: geology and natural hazards

What public services say about the ground beneath the commune (population 87) 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

Semuy at a glance

Seismic zone
1 of 5 (very low)
Radon potential
Category 1 of 3 (low potential)
Recognised natural disasters
5 since 1987
Underground cavities recorded
None
Ground movements recorded
1
Risk prevention plans
1

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
  • Mouvement de terrain

Recognised natural disasters

5 events recognised as a natural disaster by ministerial order since 1987.

  • Inondations et/ou coulées de boue: 5
  • Mouvement de terrain: 1

  1. 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.

  2. Inondations et/ou coulées de boue

    Event from 17/01/1995 to 31/01/1995, order published in the Journal officiel on 08/02/1995.

  3. Inondations et/ou coulées de boue

    Event from 20/12/1993 to 02/01/1994, order published in the Journal officiel on 15/01/1994.

  4. Inondations et/ou coulées de boue

    Event from 19/12/1993 to 02/01/1994, order published in the Journal officiel on 10/06/1994.

  5. Inondations et/ou coulées de boue

    Event from 20/07/1987 to 21/07/1987, order published in the Journal officiel on 30/10/1987.

Earthquakes and radon

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.

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…).

1 ground movement recorded (landslides, rockfalls, collapses, mudflows…).

See cavities and ground movements on the map

Risk prevention plans

  • PPRi_Vallée de l’Aisne

    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.