The basic seismic acceleration, ab is a characteristic value of the horizontal acceleration of the land surface, attributed to each municipality.
In the list in Annex 1 to NCSE-02 (seismic-resistant construction rule: general part and building), the values of the basic seismic acceleration equal to or greater than 0.04 g, together with those of the contribution coefficient K, detailed by municipality, can be consulted.
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