Publication Date:
2023-06-20
Description:
The seismic shaking of an area is strongly affected by the local geological stratigraphy (e.g., the presence of soft soils overlaying a rocky bedrock). The so-called local site effects are deeply investigated in literature and must be considered for the estimation of seismic effects on structures and urban planning. Thus, the Seismic Microzonation (SM), is the process aimed at identifying and mapping, usually at urban/municipality scale and in terms of ground shaking parameters and susceptibility to ground instabilities, the subsoil local response in a given area. The Italian Guidelines for Seismic Microzoning have been in used in Italy since 2008. According to these guidelines a modular approach that identify three levels of details is proposed. The aim of the level is to identify areas characterized by the same seismic response. These areas are called homogenous micro-zones in the seismic perspective and are defined on the basis of available data, new geological/geomorphological surveys, and low-cost geophysical measurements. These homogenous micro-zones in the seismic perspective are expected to have the same resonance frequency and to amplify the seismic input more or less in the same way. In this work the results of a single station seismic noise campaign carried out in the city of Trieste (Italy) are presented. Thirty three measurements, analysed according to the horizontal to vertical spectral ratio (H/V) techniques, were carried out over four different homogenous micro-zones in the seismic perspective. Results show that the hypothesis of homogenous micro-zone in the seismic perspective is not always verified.
Language:
English
Type:
info:eu-repo/semantics/conferenceObject
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