Annex B to Ministerial Decree 14/1/2008 sets out the geographical coordinates and the related parameters defining the seismic action of 10751 nodes (reference network) according to 9 values of the return period. The seismic action results from a weighted average of the seismic actions calculated in the 4 nodes closest to the site of interest. The spectral parameters, calculated on the horizontal rigid reference site, are the maximum horizontal ground acceleration, and, in relation to the horizontal acceleration spectrum, the maximum value of the amplification factor and the start period of the constant speed section
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