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Seismic zones map - France

What are the French seismic zones ?

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
Seismicity agr 0.4m/s2 0.7m/s2 1.1m/s2 1.6m/s2
Eurocodes - Seismic zones map - France (2015-2021) Seismic zoning of France (2015-2021)
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 0.4m/s2 0.7m/s2 1.1m/s2 3.0m/s2 3.0m/s2
Seismicity of overseas departments
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
Seismicity of overseas territories and overseas collectivities

Is my new building concerned ?

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

Buildings at normal risk are classified into four categories of increasing importance, from category I with low stake in category IV which gathers the strategic and essential structures crisis management.

Importance class Description
I
  • Buildings in which there is no human activity requiring a long-term stay.
II
  • Individual dwellings.
  • Establishments open to the public (ERP) of categories 4 and 5.
  • Collective dwellings less than 28m high.
  • Offices or non-ERP commercial establishments, h≤28m, max. 300 pers.
  • Industrial buildings that can accommodate up to 300 people.
  • Parking lots open to the public.
III
  • Category 1, 2 and 3 ERP.
  • Collective dwellings and offices, h>28m.
  • Buildings that can accommodate more than 300 people.
  • Health and social establishments.
  • Collective energy production centers.
  • Schools.
IV
  • Buildings essential to civil security, national defense and maintaining public order.
  • Buildings ensuring the maintenance of communications, production and drinking water storage, public energy distribution.
  • Buildings ensuring aviation safety control.
  • Health facilities necessary for crisis management.
  • Weather centers.

Example of results given by the software

See the features of Eurocodes Zoning for seismic analysis in France
Available in English/French, otherwise «Google Translate»!

B1 - Localization

French flag
6.9511° , 43.4979°
1019565m , 6274536m
Large map
Simple map
06590 Théoule-sur-Mer, Provence-Alpes-Côte d'Azur

B2 - Elevations

Elevation map to calculate orography factor
Coordinates 6.9536°, 43.4972° 6.9455°, 43.4994° 6.9455°, 43.4994° 6.9368°, 43.5019°
Elevations 9m 244m 244m 54m
Obstacle effective height H 235m 190m
Slope actual length Lu / Ld 698.4m 754.4m
Slope angle Φ 33.7% 25.2%
Horizontal distance site/top x 483.1m
Elevation at the place of construction 58m

B3 - Building

common structure
50years
8.0m
15°

B4 - Terrain categories

Terrain map
Sectors 1 2 3 4
Categories IIIb 0 0 IIIb
Radius R of the angular sector : 300m

C1 - Snow NF EN 1991-1-3/NA (may 2007) + A1 (july 2011)

A2 (sk,0 = 0.45kN/m2)
MANDELIEU-LA-NAPOULE,ALPES-MARITIMES (06)
sk,58m = 0.45 kN/m2

s50ans = 0.45 kN/m2

sad = 1.0kN/m2

C2 - Wind NF EN 1991-1-4/NA (march 2008) + A1 (july 2011) + A2 (september 2012) + A3 (april 2019)

2 (vb,0 = 24.0m/s)
THEOULE-SUR-MER, ALPES-MARITIMES (06)
3
Sectors 1 2 3 4
Sector definition from 330° to 60° from 60° to 150° from 150° to 240° from 240° to 330°
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 0.02
Probability factor cprob 1.0
Directional factor cdir 1.0 0.85 0.85 1.0
Basic wind velocity vb 24.0m/s 20.4m/s 20.4m/s 24.0m/s
Reference roughness length z0,II 0.05m
Roughness length z0 0.5m 0.005m 0.005m 0.5m
Terrain factor kr 0.223 0.162 0.162 0.223
Height above ground z 8.0m
Minimum height zmin 9.0m 1.0m 1.0m 9.0m
Roughness factor cr(z) 0.645 1.193 1.193 0.645
Obstacle type isolated hills
Exposure type - upwind - downwind
Factor depending on the type and dimensions of the obstacle s max 0.0 0.8 0.0 0.8
Orography factor* co(z) 1.0 1.235 1.0 1.112
Mean wind velocity vm(z) 15.5m/s 30.1m/s 24.3m/s 17.2m/s
Turbulence factor kl 0.923 1.0 1.0 0.923
Standard deviation of the turbulence σv 4.943m/s 3.299m/s 3.299m/s 4.943m/s
Turbulence intensity Iv(z) 0.319 0.11 0.136 0.287
Air density ρ 1.225kg/m3
Exposure factor ce(z) 1.347 3.84 2.774 1.55
Peak velocity pressure qp(z) 475.1N/m2 978.9N/m2 707.1N/m2 546.7N/m2
Peak wind velocity for Serviceability Limit States vp(z),SLS 100.3km/h 143.9km/h 122.3km/h 107.6km/h
Peak wind velocity for Ultimate Limit States vp(z),ULS 122.8km/h 176.3km/h 149.8km/h 131.7km/h
* The orography factor is calculated for a well individualized obstacle (an emergent zone compared to a general ground without marked relief)

C3 - Seism Code of the Environment - Article D563-8-1 (09/01/2015) + JORF n°0248 of 24/10/2010 text N°5

2 (0.7m/s2)
Theoule-sur-Mer, Alpes-Maritimes (06)
A seismic analysis may be required for this building. You can check if your building is concerned on LEGIFRANCE.