2D numerical simulations of earthquake ground motion: examples from the Marche Region,Italy |
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| Authors: | Giovanna Laurenzano Enrico Priolo Emanuele Tondi |
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| Institution: | (1) Dipartimento Centro di Ricerche Sismologiche (CRS), Istituto Nazionale di Oceanografia e di Geofisica Sperimentale (OGS), Borgo Grotta Gigante 42/c, 34010 Sgonico, Trieste, Italy;(2) Dipartimento di Scienze della Terra, Università di Camerino, Via Gentile III da Varano, 62032 Camerino, MC, Italy |
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| Abstract: | A detailed numerical simulation of the ground motion and a site response analysis for two towns in the Marche Region (Treia
and Cagli) is carried out on the basis of structural models deduced from available geological and geophysical data. In both
cases, the reference event is an M = 5.7 earthquake associated with a normal fault located beneath each town. The ground motion is computed using the 2D spectral
element method (SPEM 2D). The method solves the propagation of the seismic field through complex geological structures and
enables an estimate of the effects of deep crustal structure, superficial geology, and topography on ground motion. Numerical
simulations of the seismic field are performed along 2D vertical planes containing the seismic source. Strong ground motion
has not been yet recorded in the two towns; therefore, the numerical simulation of ground motion represents a way to overcome
the lack of instrumental data. The simulations carried out for Treia show that ground motion is influenced by both source
mechanism and effects due to propagation through the geological structure, while ground motion in Cagli features strong local
effects, caused by the presence of alluvial deposits under a large area of the town. |
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| Keywords: | Spectral element method Seismic microzonation Apennine Treia Cagli |
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