Le Tech: geology and natural hazards

Seismic zone

4 of 5 (medium)

Radon potential

Category 3 of 3 (significant potential)

Recognised natural disasters

8 since 1982

Underground cavities recorded

2

Ground movements recorded

45

Risk prevention plans

1

Natural and technological hazards to which the commune is exposed, according to the national GASPAR database.

• Inondation: 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
• Feu de forêt
• Radon

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

• Inondations et/ou coulées de boue: 8
• Chocs mécaniques liés à l’action des vagues: 1
• Poids de la neige: 1
• Tempête: 1

1. Inondations et/ou coulées de boue

   Event from 21/01/2020 to 23/01/2020, order published in the Journal officiel on 13/03/2020.

2. Inondations et/ou coulées de boue

   Event from 29/11/2014 to 01/12/2014, order published in the Journal officiel on 11/12/2014.

3. Inondations et/ou coulées de boue

   Event from 05/03/2013 to 06/03/2013, order published in the Journal officiel on 25/05/2013.

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

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

5. Inondations et/ou coulées de boue

   Event from 15/12/1995 to 16/12/1995, order published in the Journal officiel on 17/04/1996.

6. Inondations et/ou coulées de boue

   Event from 26/09/1992 to 27/09/1992, order published in the Journal officiel on 13/10/1992.

7. Inondations et/ou coulées de boue, Poids de la neige

   Event from 22/01/1992 to 25/01/1992, order published in the Journal officiel on 24/09/1992.

8. 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 4 of 5: medium. 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…).

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

See cavities and ground movements on the map

• PER - Le Tech

  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.

• Serralongue (66)
• Montferrer (66)
• Prats-de-Mollo-la-Preste (66)
• Lamanère (66)
• Saint-Laurent-de-Cerdans (66)
• Corsavy (66)
• Arles-sur-Tech (66)
• Coustouges (66)

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.