Dataset unloading service: Soil Vibration Frequency Chart

Thematic map showing the data of the surveys of the so-called "microtremor" purchased on the regional territory as part of the studies of the National Seismic Risk Prevention Plan (ex art. 11, L.77/09) The surveys of microtremor or environmental noise, technically measures of HVSR (acronym of horizontal to vertical spectral ratio), provide an experimental curve that allows to determine the frequency of fundamental vibration (f0) or resonance of the ground below the measurement point. When the measurement is carried out on an outcropping seismic base, the curve does not show significant maximums and settles around the amplitude value 1 and therefore seismic resonance phenomena are not expected. Where, on the other hand, the measurement takes place in the presence of a rocky base dominated by loose covering deposits, the curve shows one or more peaks of lithostratigraphic origin - Year 2024 - EPSG: 3003 - Territorial coverage: the whole Ligurian territory