Aula38,39,40 bio10
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Transcript of Aula38,39,40 bio10
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Biologia/Geologia IBiologia/Geologia I Tema III
Vulcanologia
Colégio da Lapa 2010/2011 Biologia/Geologia
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Colégio da Lapa 2010/2011 Biologia/Geologia 2
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Classificação dos sismos
Classificação dos sismos de acordo com a profundidade do foco:
Superficiais – Inferior a 70 KmIntermédios – Entre 70 e 300 KmProfundos – Inferior a 300 Km
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Frentes de Onda
A energia emitida a partir do foco propaga-se segundo superfícies esféricas, com centro no próprio hipocentro, transmitindo-se a perturbação em todas as direcções
As superfícies esféricas definidas pelo conjunto de pontos que se encontram na mesma fase do movimento, são designadas por frentes de onda
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Raios sísmicos
As linhas radiais perpendiculares à frente de onda, no caso da onda esférica
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Teoria do Ressalto Elástico
Proposta pelo geólogo Henry Fielding ReidAs forças tectónicas criam estados de
tensão que vão deformando lentamente as rochas
A deformação acentua-se durante décadas, séculos ou até mesmo milénios
As rochas atingem o limite máximo de acumulação de energia
Num dado ponto ocorre uma falha
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Tipos de Ondas
Ondas de Volume: No interior da Terra. Ondas P e Ondas S
Ondas Superficiais: As ondas internas podem, eventualmente, atingir a superfície. Ondas de Love e Ondas de Rayleigh
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