The shakemap procedure has been developed by the US Geological Survey (Wald et al., 1999b) and full information on the methodology and the latest version of the software are described in Worden et al. (2020) . The shakemaps shown in this site web portal have been generated using the new configuration of the ShakeMap procedure for Italy and fully described by Michelini et al. (2020).


More info about maps, can be found in the INGVterremoti post here (in Italian).


The Vs30 grid is available for download as a zip file here.


Bibliography:
Michelini, A., Faenza, L., Lauciani, V., & Malagnini, L. (2008). ShakeMap implementation in Italy. Seismological Research Letters, 79(5), 688–697.

Michelini, A., Faenza, L., Lanzano, G., Lauciani, V., Jozinović, D., Puglia, R., & Luzi, L. (2020). The New ShakeMap in Italy: Progress and Advances in the Last 10 Yr. Seismological Research Letters, 91(1), 317–333. http://doi.org/10.1785/0220190130

Oliveti, I., Faenza, L., & Michelini, A. (2022). New reversible relationships between ground motion parameters and macroseismic intensity for Italy and their application in ShakeMap. Geophysical Journal International, 231(2), 1117–1137, https://doi.org/10.1093/gji/ggac245

Wald, D. J., Quitoriano, V., Heaton, T. H., & Kanamori, H. (1999a). Relationships between Peak Ground Acceleration, Peak Ground Velopcity and Modified Mercalli Intensity in California. Earthquake Spectra, 15(3), 557–564.

Wald, D. J., Quitoriano, V., Heaton, T. H., Kanamori, H., Scrivner, C. W., & Worden, C. B. (1999b). TriNet “ShakeMaps”: Rapid Generation of Peak Ground Motion and Intensity Maps for Earthquakes in Southern Califiornia. Earthquake Spectra, 15(3), 537–555.