Abstract
The earthslide that occurred along the coastal strip near the city of Ancona is one of the largest historical events of this type; however, this hazard is common to large areas of peninsular Italy, especially on the Adriatic slope of the Apenninic Mountain Range. A programme of investigation has been undertaken after the event, aiming to both short-term and long-term objectives. The contribution of geophysical methods consisted of refraction profiles, electrical soundings and seismic measurements in boreholes. The refraction survey, in spite of the very slight contrast of physical properties in geological formations (mainly Pliocene clays) gave a first model of the earthslide, that assumed a slip mechanism at large depth and helped to plan the boreholes. The “down hole” and the sonic logging in boreholes have been very useful for the interpretation of stratigraphies, their data verifying the results of the seismic survey. As far as the long-term objectives are concerned, the experience of the survey indicates the criteria to be followed in prognostic investigation of similar areas prone to landslides.
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