Pericolosità sismica di riferimento per il territorio nazionale MPS04

Seismic hazard values are expressed in terms of maximum horizontal component of the expected ground shaking (ag=fraction of gravity acceleration) with 10% probability of exceedance in 50 years, referred to rocky soils (Vs30>800 m/s, class A, paragraph 3.2.1 in Ministerial Decree September 14th 2005).
The ag values have been estimated according two grid points not overlapping:
a) with step 0.05 degrees, according the requirements of the Ordinance 3519 (Official Gazette n.108, May 11th 2006), with 16921 points overall;
b) with step 0.02 degrees, for a better resolution, with 104565 points overall.
For each point the standard estimate of ag (50th percentile) and the uncertainties expressed by 16th and 84th percentiles are available. Grid points are sorted from West to East and from North to South