A method for the analysis of macroseismic questionnaires

We attempt to put right an algorithm for the objective evaluation of seismic intensities by questionnaires. For its investigation, the National Institute of Geophysics in Rome uses, a macroseismic questionnaire composed of 79 quesitons, distributed into 10 degrees of the Mercalli-Cancani-Sieberg (MCS) scale. This algorithm makes use of the weighted mean of the number of given answers concerning each degree. This kind of weighted mean seems to be suitable for avoiding the phenomena of the effects of superimposition.