Map of local soil condition
The geophysical MASW survey is used for the estimation of local shear wave velocity profiles. Within the Component 2 of the CRONOS project, we plan to assess local soil conditions using the MASW survey on each instrument location (accelerograph, seismograph) to cover local and regional changes of site characteristics. This will allow us to derive local and regional maps of Vs30 characterization based on Eurocode 8 site classification around each instrument location and for specific target seismic prone zones. Furthermore, these will provide information about potential local site amplification and earthquake ground motion attenuation with distance and can be used for nonlinear site amplification models based on empirical and stochastic modelling.
HVSR survey is used for the estimation of fundamental site resonance frequency and bedrock depth. In addition, they can be used in seismic monitoring of risky buildings in seismic-prone areas. Measurements will be performed at the same locations as the MASW profiles, however, they can be performed on a denser grid of measurement. Based on the results, several outcomes are expected:
• local site Vs30 preliminary estimation based on the Eurocode 8 site classification,
• information about fundamental site frequencies from HVSR-spectra peaks and bedrock depths,
• definition of potentially seismic danger zones in terms of the site-specific soil-structure (building) resonance at a fundamental frequency that can be implemented into earthquake-resistant planning for given historical sites and structures,
• indication of areas prone to high site amplification that needs to be further investigated in more detail using numerical site response analysis modelling,
• engineering-geological mapping and detection/indication of potentially active faults in the close area.
Maps will be available on this website…