Modelação numérica dos efeitos de sítio sísmicos em Lisboa: Topografia e morfologia do subsolo
DOI:
https://doi.org/10.14195/2184-8394_167_4Palavras-chave:
Resposta sísmica local, Modelação numérica, Fatores de amplificaçãoResumo
Lisboa apresenta um risco sísmico moderado a elevado devido à sua história sísmica, importância socioeconómica e densidade populacional. Além disso, o contexto geológico da cidade caracteriza-se por uma estrutura litostratigráfica complexa, variação topográfica significativa, camadas inclinadas, camadas de rochas sedimentares intercaladas em depósitos de solo, bem como camadas de areia e argila na mesma unidade geológica que conduzem a inversões no perfil de velocidade da onda de corte e a uma grande dispersão das propriedades geotécnicas dentro de cada unidade geológica. Os efeitos de sítio foram avaliados através da análise da resposta sísmica local, ao longo de dois perfis representativos das condições geomorfológicas da cidade, considerando os dois tipos de ação sísmica definidos no Anexo Nacional do Eurocódigo 8. Os resultados são apresentados em termos de fatores de amplificação e espetros de resposta em pontos selecionados, sendo a razão espetral 2D/1D utilizada para identificar as áreas onde predominam os efeitos sísmicos bidimensionais.
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Direitos de Autor (c) 2026 Liliana Oliveira, Rui Carrilho Gomes, Paula Teves-Costa
Este trabalho encontra-se publicado com a Licença Internacional Creative Commons Atribuição 4.0.
