Web-based macroseismic survey in Italy: method validation and results |
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Authors: | Sbarra Paola Tosi Patrizia De Rubeis Valerio |
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Institution: | (1) Istituto Nazionale di Geofisica e Vulcanologia, Roma, Via di Vigna Murata, 605, 00143 Rome, Italy |
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Abstract: | A new method of macroseismic surveys, based on voluntary collaboration through the Internet, has been running at the Istituto
Nazionale di Geofisica e Vulcanologia (INGV) since July 2007. The macroseismic questionnaire is addressed to a single non-specialist;
reported effects are statistically analysed to extrapolate a probabilistic estimate of Mercalli Cancani Sieberg and European
Macroseismic Scale intensities for that observer. Maps of macroseismic intensity are displayed online in almost real time
and are continuously updated when new data are made available. For densely inhabited zones, we have received reports of felt
effects for even very small events (M = 2). Six earthquakes are presented here, showing the ability of the method to give fast and interesting results. The effects
reported in questionnaires coming from three towns are carefully analysed and assigned intensities are compared with those
derived from traditional macroseismic surveys, showing the reliability of our web-based method. |
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