Análise da resposta sísmica em áreas sedimentárias extra-carpatias romenas
DOI:
https://doi.org/10.14195/1647-7723_28-2_7Palavras-chave:
Resposta sísmica, registos de movimentos do soloResumo
O movimento do solo é analisado, em termos de resposta sísmica, usando gravações processadas e características espectrais relacionadas. A análise é realizada para alguns locais representativos, com diferentes condições geológicas locais. Os dados usados consistem em registros dos últimos eventos sísmicos mais fortes (30 de agosto de 1986,
Mw = 7.1, 30 de maio de 1990, Mw = 6.9 e 31 de maio de 1990, Mw = 6.4). A abordagem usada para avaliar as características particulares dos efeitos sísmicos pode abrir uma nova perspectiva no microzoneamento e estudo do risco. No contexto da sismicidade de profundidade intermédia de Vrancea, a escolha destes locais é perfeitamente justificada, dado que os seus efeitos podem ser encontrados até longas distâncias epicentrais. Deste modo, o estudo pretende destacar as particularidades que ocorrem devido à oscilação dos depósitos sedimentares, devido ao forte movimento sísmico do solo em diferentes áreas. Foram introduzidos fatores de amplificação espectral para se ter uma representação quantitativa, da variabilidade resultante dos efeitos locais.
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