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The site effect is usually associated with local geological conditions, whichincrease or decrease the level of shaking compared with standard attenuationrelations. We made an attempt to see in the macroseismic data of Italy someother effects, namely, hot/cold spots in the terminology of Olsen (2000), whichare related to local fault geometry rather than to soil conditions. We give alist of towns and villages liable to amplify (+) or to reduce (-) the level ofshaking in comparison with the nearby settlements. Relief and soil conditionscannot always account for the anomalous sites. Further, there are sites whereboth (+) and (-) effects are observed depending on the earthquake. The oppositeeffects can be generated by events from the same seismotectonic zone and alongthe same direction to the site. Anomalous sites may group themselves intoclusters of different scales. All isolated anomalous patterns presented in thispaper can be used in hazard analysis, in particular, for the modeling andtesting of seismic effects.

Hot-Cold Spots in Italian Macroseismic Data