Realistic modeling of seismic input for megacities and large urban areas (the UNESCO/IUGS/IGCP project 414)

摘要: The project addressed the problem of pre-disaster orientation: hazard prediction, risk assessment, and mapping, in connection with seismic activity maninduced vibrations. definition realistic input has been obtained from computation a wide set time histories spectral information, corresponding to possible seismotectonic scenarios for different source structural models. innovative modeling technique, that constitutes common tool entire project, takes into account source, propagation local site effects. This is done using first principles physics about wave generation complex media, does not require resort convolutive approaches, have proven be quite unreliable, mainly when dealing geological structures, most interesting practical point view. In fact, several techniques proposed empirically estimate effects observations convolved theoretically computed signals simplified models, supply reliable information response non-interfering phases. They are adequate real cases, sequel formed by interfering waves. availability numerical simulations enables us reliably amplification even exploiting available geotechnical, lithological, geophysical parameters, topography medium, tectonic, historical, palaeoseismological data, ground motion very important base knowledge preparation groundshaking represent valid economic microzonation. can fruitfully used civil engineers design new seismoresistant constructions reinforcement existing built environment, and, therefore, particularly powerful prevention aspects Civil Defense. We present selection main results cities Algiers, Beijing, Bucharest, Cairo, Debrecen, Delhi, Naples, Rome, Russe, Santiago de Cuba, Sofia, Thessaloniki Zagreb.