Description
The seismic hazard of the national territory is described by the Reference Seismic Hazard Map (MPS04). The hazard is calculated probabilistically and expressed as acceleration on rigid soil, i.e. soil that does not consider possible amplifying effects due to stratigraphy or topography. For this map, the Trentino territory presents acceleration values within a medium-low range.
The seismic hazard map is used as a reference by technical regulations, for design and planning purposes. In particular, the current Technical Standards for Construction (approved by Ministerial Decree dated 17 January 2018) provide for the use of these ground acceleration values for the construction of works and infrastructures. It must be remembered that, by virtue of the Provincial Council Resolution no. 1351 of 30 May 2008, new designs of public works on the territory of the Autonomous Province of Trento must adopt a nominal life greater than or equal to 100 years, regardless of the class of use.
Another necessary element for design purposes is the definition of the subsoil category, i.e. the seismic class to which the subsoil of the work belongs. With the aim of presenting a working tool for the professional world and public administrations, the Geological Survey has produced a thematic map of the subsoil categories in the province. For the realisation of this project, data from the geophysical and geognostic survey databases were analysed, as well as available geological and geomorphological mapping. It must be emphasised that this cartography is inherently imprecise and inaccurate, due to the non-homogeneous distribution of the source data and the necessarily simplified creation methodology. It therefore represents an additional cognitive tool, which is not exhaustive and is constantly being modified and updated.