Seismic microzonation studies for the city of Ragusa (Italy)
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- 作者：S. Grasso ; M. Maugeri
- 关键词：Historical seismicity ; Geotechnical characterisation ; Earthquake ; Site effects ; Geo-settled shaking maps.
- 刊名：Soil Dynamics and Earthquake Engineering
- 出版年：January, 2014
- 年：2014
- 卷：56
- 期：Complete
- 页码：86-97
- 全文大小：9825 K
文摘
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 鈥淰al di Noto鈥?/em> earthquake of January 11, 1693 (with intensity X-XI on MCS scale, magnitude MW=7.41 and epicentral distance of about 53 km); the 鈥淓tna鈥?/em> 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 鈥淢odica鈥?/em> 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 鈥淪icilian鈥?/em> 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.