Perigos geológicos nos Açores: ocorrências mais significativas nos últimos 30 anos e perspetivas futuras Article Swipe

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Ana Malheiro , Paulo Amaral , Filipe Marques , Letícia do Socorro Cunha , F. C. R. Fernandes ·

YOU? · · 2025 · Open Access · · DOI: https://doi.org/10.34037/978-989-9053-30-4_16-01

Os Açores situam-se numa região tectónica e vulcanicamente ativa. Devido a este enquadramento, as ilhas encontram-se sujeitas a muitos perigos geológicos, incluindo sismos, deslizamentos de terras e erosão costeira; alguns exemplos de eventos ocorridos são apresentados neste trabalho. Os principais danos resultantes de sismos estavam relacionados com um ou mais dos seguintes fatores: 1) localização de estruturas perto de falhas; 2) solos de fundação instáveis; 3) má qualidade dos materiais e métodos de construção; 4) desrespeito pelos códigos de construção; e 5) falta de manutenção dos edifícios. Os grandes deslizamentos de terras foram desencadeados por precipitação intensa e /ou de longa duração, induzidos por sismos, ou promovidos pela erosão costeira. A natureza friável e incoerente dos solos vulcânicos e a presença de rochas por vezes bastante fraturadas também contribuiu significativamente para esses processos, fatores por vezes agravados pela ação antrópica. A erosão costeira resulta de circunstâncias naturais e também da atividade humana. Os locais onde ela assume taxas mais elevadas podem constituir um risco para as populações e infraestruturas situadas perto das cristas das arribas. Por fim, apresentam-se algumas medidas com vista à mitigação destes perigos geológicos.

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Title: Perigos geológicos nos Açores: ocorrências mais significativas nos últimos 30 anos e perspetivas futuras

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Publication year: 2025

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Authors: Ana Malheiro, Paulo Amaral, Filipe Marques, Letícia do Socorro Cunha, F. C. R. Fernandes

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Landing page: https://doi.org/10.34037/978-989-9053-30-4_16-01

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