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area affected by offshore seismicity. This city was almost completely destroyed by an earthquake of IX degree
intensity on the Mercalli-Cancani-Sieberg scale (MCS) on October 30, 1930. This quake is the most recent and
the best documented. In particular, this shock was characterized by strong differences in the damage levels at a
scale of hundreds and tens of metres. The geographic position of Senigallia at the mouth of a river and its soil
conditions, similar to many other coastal historical and tourist centres in the region, make this earthquake an
important case history, useful for a better understanding of the seismic risk of the entire coastal area. This note
reports the first results of a study on the possible causes of the different damage levels. The research started
with the history and town-planning evolution of Senigallia, then. the regional or local geological characteristics
were considered by geological, geotechnical and geophysical investigations.
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