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We present results from a comparative analysis of empirical and syntheticshapes for isoseismals of low intensity (I = IV-VI on the MCS scale) for sixItalian earthquakes of ML = 4.5-6. Our modelling of isoseismals is based on aplane stratified earth model and on the dou-ble-couple point sourceapproximation to calculate seismograms in the frequency range f =< 1 Hz. With aminimum of parameter variation we demonstrate that the low intensityisoseismals provide information on source geometry. We strive to avoidsubjectivity in isoseismal construc-tions by using the new Diffuse Boundarymethod, which visualizes isoseismals with their uncer-tainty. Similar resultsin this direction are known for large earthquakes (ML ~ 6 or greater) withextended sources and for the higher isoseismals (I >= VI on the MM scale). Thelatter studies disregard the earth structure, use a greater number ofparameters, and therefore have greater possibilities for fitting the data thanour approach.

Shape of Empirical and Synthetic Isoseismals: Comparison for Italian M \le 6 Earthquakes