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Seism zones in Belgium

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Seismic zoning to consider in Belgium

Seismic zoning map to consider in Belgium

Reference peak ground acceleration on type A ground in m/s², by zone according to NBN EN 1998-1 ANB:2009(F)
Zones 0 1 2 3 4
Reference peak ground acceleration agr on type A ground in m/s² No significant acceleration 0,39 0,59 0,78 0,98

Values of the periods and soil factor describing the shape of the horizontal response spectra
Ground type S TB(S) TC(S) TD(S)
A 1,0 0,05 0,25 1,2
B 1,35 0,05 0,25 1,2
C 1,5 0,10 0,25 1,2
D 1,8 0,1 0,3 1,2
E 1,6 0,05 0,25 1,2

Values of parameters describing the shape of the vertical response spectra
Spectrum avg / ag TB(S) TC(S) TD(S)
Type 2 0,45 0,05 0,15 1,0
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