Seismic microzonation studies for the city of Ragusa (Italy) |
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| Institution: | 1. Institute of Crustal Dynamics, China Earthquake Administration, Beijing 100085, China;2. Kentucky Geological Survey, University of Kentucky, Lexington, KY 40506, USA;3. Department of Earth and Environmental Sciences, University of Kentucky, Lexington, KY 40506, USA;4. Institute of Geophysics, China Earthquake Administration, Beijing 100081, China;5. Institute of Engineering Mechanics, China Earthquake Administration, Harbin 150080, China;1. Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Via di Vigna Murata 605, 00143 Roma, Italy;2. Istituto Nazionale di Geofisica e Vulcanologia, L''Aquila, Italy;3. Department of Geosciences, University of Malta, Msida MSD 2080, Malta;1. Department of Sciences and Technologies, University of Sannio, Benevento, Italy;2. Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Napoli “Osservatorio Vesuviano”, Napoli, Italy;3. Institute of Archaeological and Monumental Heritage, National Research Council (IBAM-CNR), Potenza, Italy |
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| Abstract: | The seismic history of the city of Ragusa (Italy), the geotechnical characterisation of the subsoil and the site response analysis should be correctly evaluated for the definition of the Seismic Geotechnical Hazard of the city of Ragusa, through geo-settled seismic microzoning maps. Basing on the seismic history of the city of Ragusa, the following earthquake scenarios have been considered: the “Val di Noto” earthquake of January 11, 1693 (with intensity X–XI on MCS scale, magnitude MW=7.41 and epicentral distance of about 53 km); the “Etna” earthquake of February 20, 1818 (with intensity IX on MCS scale, magnitude MW=6.23 and epicentral distance of about 64 km); the Vizzini earthquake of April 13, 1895 (with intensity I=VII–VIII on MCS scale, magnitude MW=5.86 and epicentral distance of about 26 km); the “Modica” earthquake of January 23, 1980 (with intensity I=V–VI on MCS scale, magnitude MW=4.58 and epicentral distance of about 10 km); the “Sicilian” earthquake of December 13, 1990 (with intensity I=VII on MCS scale, magnitude MW=5.64 and epicentral distance of about 50 km). Geotechnical characterisation has been performed by in situ and laboratory tests, with the definition of shear wave velocity profiles in the upper 30 m of soil. Soil response analyses have been evaluated for about 120 borings location by some non-linear 1-D models. Finally the seismic microzonation of the city of Ragusa has been obtained in terms of maps with different peak ground acceleration at the surface; shaking maps for the central area of the city of Ragusa were generated via GIS for the earthquake scenarios. |
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| Keywords: | Historical seismicity Geotechnical characterisation Earthquake Site effects Geo-settled shaking maps |
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