In France, the division is specified in the law (not in the national annex). The French metropolitan area is divided into four seismic zones identified from 1 to 4 (The map below was created from this data).
Zone | 1 | 2 | 3 | 4 |
---|---|---|---|---|
Seismicity | Very low | Low | Moderate | Medium |
Seismicityagr | 0.4 m/s2 | 0.7 m/s2 | 1.1 m/s2 | 1.6 m/s2 |
Seismic zoning of France (2015-2024)
The French overseas departments, overseas territories and overseas collectivities each have a specific seismicity.
Zone | French Guiana | Reunion Island | Mayotte Island | Martinique Island | Guadeloupe Island |
---|---|---|---|---|---|
Seismicity | Very low | Low | Moderate | Strong | Strong |
Reference peak ground acceleration on rock >agr | 0.4 m/s2 | 0.7 m/s2 | 1.1 m/s2 | 3.0 m/s2 | 3.0 m/s2 |
Zone | Saint Pierre and Miquelon | New Caledonia | Wallis and Futuna | Saint Martin | Saint Barths |
---|---|---|---|---|---|
Seismicity | Very low | Moderate | Strong | Strong | Strong |
Reference peak ground acceleration on rock >agr | 0.4m/s2 | 1.1m/s2 | 3.0m/s2 | 3.0m/s2 | 3.0m/s2 |
You can check if your building is concerned on the french regulations on LEGIFRANCE Here is the summary:
Zone/Importance class | Normal risk | Special risk | |||
---|---|---|---|---|---|
I | II | III | IV | ||
Zone 1 | No | Yes | |||
Zone 2 | No | Yes | |||
Zone 3 | No | Yes | |||
Zone 4 | No | Yes | |||
Zone 5 | No | Yes |
See the features of Eurocodes Zoning for snow analysis in France
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Distances / Direction | At the place of construction | 500m | 1000m |
---|---|---|---|
North | 436 m | 360m | 407m |
Northeast | 405m | 465m | |
East | 456m | 473m | |
Southeast | 419m | 446m | |
South | 449m | 476m | |
Southwest | 432m | 411m | |
West | 360m | 468m | |
Northwest | 403m | 452m |
Sectors | 1 | 2 | 3 | 4 |
---|---|---|---|---|
Categories | IIIa | IV | IV | IV |
NF EN 1991-1-3/NA (may 2007) + A1 (july 2011)
NF EN 1991-1-4/NA (march 2008) + A1 (july 2011) + A2 (september 2012) + A3 (april 2019)
Sectors | 1 | 2 | 3 | 4 |
---|---|---|---|---|
Sector definition | from 35 ° to 125 ° | from 125 ° to 215 ° | from 215 ° to 305 ° | from 305 ° to 35 ° |
Fundamental value of the basic wind velocity vb,0 | 24.0m/s | |||
Shape parameter K | 0.2 | |||
Exponent n | 0.5 | |||
Annual probability of exceedence p | 0.01 | |||
Probability factor cprob | 1.038 | |||
Directional factor cdir | 0.7 | 1.0 | 1.0 | 1.0 |
Basic wind velocity vb | 17.4m/s | 24.9m/s | 24.9m/s | 24.9m/s |
Reference roughness length z0,II | 0.05m | |||
Roughness length z0 | 0.2m | 1.0m | 1.0m | 1.0m |
Terrain factor kr | 0.209 | 0.234 | 0.234 | 0.234 |
Height above ground z | 15.0m | |||
Minimum height zmin | 5.0m | 15.0m | 15.0m | 15.0m |
Roughness factor cr(z) | 0.904 | 0.635 | 0.635 | 0.635 |
Orography factor * co(z) | 1.0 | 1.0 | 1.0 | 1.0 |
Mean wind velocity vm(z) | 15.8m/s | 15.8m/s | 15.8m/s | 15.8m/s |
Turbulence factor kl | 0.97 | 0.854 | 0.854 | 0.854 |
Standard deviation of the turbulence σv | 3.544m/s | 4.989m/s | 4.989m/s | 4.989m/s |
Turbulence intensity Iv(z) | 0.225 | 0.315 | 0.315 | 0.315 |
Air density ρ | 1.225kg/m3 | |||
Exposure factor ce(z) | 2.102 | 1.292 | 1.292 | 1.292 |
Peak velocity pressure qp(z) | 392.0N/m2 | 491.5N/m2 | 491.5N/m2 | 491.5N/m2 |
Peak wind velocity for Serviceability Limit States vp(z),SLS | 91.1km/h | 102.0km/h | 102.0km/h | 102.0km/h |
Peak wind velocity for Ultimate Limit States vp(z),ULS | 111.5km/h | 124.9km/h | 124.9km/h | 124.9km/h |
Code of the Environment - Article D563-8-1 (09/01/2015) JORF n°0248 of 24/10/2010 text N°5