55 resultados para Faial


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Este volume da História da Ilha do Faial dá continuidade ao projecto de cooperação estabelecido com a Universidade dos Açores, através do Centro de Estudos Gaspar Frutuoso e o seu lançamento insere-se no 180º aniversário da cidade da Horta, assinalado a 4 de Julho.

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Copyright © 2014 Société Française d’Ichtyologie.

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Dissertação de Mestrado em Engenharia do Ambiente.

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With very few exceptions, M > 4 tectonic earthquakes in the Azores show normal fault solution and occur away from the islands. Exceptionally, the 1998 shock was pure strike-slip and occurred within the northern edge of the Pico-Faial Ridge. Fault plane solutions show two possible planes of rupture striking ENE-WSW (dextral) and NNW-SSE (sinistral). The former has not been recognised in the Azores, but is parallel to the transform direction related to the relative motion between the Eurasia and Nubia plates. Therefore, the main question we address in the present study is: do transform faults related to the Eurasia/Nubia plate boundary exist in the Azores? Knowing that the main source of strain is related to plate kinematics, we conclude that the sinistral strike-slip NNW-SSE fault plane solution is not consistent with either the fault dip (ca. 65, which is typical of a normal fault) or the ca. ENE-WSW direction of maximum extension; both are consistent with a normal fault, as observed in most major earthquakes on faults striking around NNW-SSE in the Azores. In contrast, the dextral strike-slip ENE-WSW fault plane solution is consistent with the transform direction related to the anticlockwise rotation of Nubia relative to Eurasia. Altogether, tectonic data, measured ground motion, observed destruction, and modelling are consistent with a dextral strike-slip source fault striking ENE-WSW. Furthermore, the bulk clockwise rotation measured by GPS is typical of bookshelf block rotations observed at the termination of such master strike-slip faults. Therefore, we suggest that the 1998 earthquake can be related to the WSW termination of a transform (ENE-WSW fault plane solution) associated with the Nubia-Eurasia diffuse plate boundary. (C) 2014 Elsevier B.V. All rights reserved.

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The morpho-structural evolution of oceanic islands results from competition between volcano growth and partial destruction by mass-wasting processes. We present here a multi-disciplinary study of the successive stages of development of Faial (Azores) during the last 1 Myr. Using high-resolution digital elevation model (DEM), and new K/Ar, tectonic, and magnetic data, we reconstruct the rapidly evolving topography at successive stages, in response to complex interactions between volcanic construction and mass wasting, including the development of a graben. We show that: (1) sub-aerial evolution of the island first involved the rapid growth of a large elongated volcano at ca. 0.85 Ma, followed by its partial destruction over half a million years; (2) beginning about 360 ka a new small edifice grew on the NE of the island, and was subsequently cut by normal faults responsible for initiation of the graben; (3) after an apparent pause of ca. 250 kyr, the large Central Volcano (CV) developed on the western side of the island at ca 120 ka, accumulating a thick pile of lava flows in less than 20 kyr, which were partly channelized within the graben; (4) the period between 120 ka and 40 ka is marked by widespread deformation at the island scale, including westward propagation of faulting and associated erosion of the graben walls, which produced sedimentary deposits; subsequent growth of the CV at 40 ka was then constrained within the graben, with lava flowing onto the sediments up to the eastern shore; (5) the island evolution during the Holocene involves basaltic volcanic activity along the main southern faults and pyroclastic eruptions associated with the formation of a caldera volcano-tectonic depression. We conclude that the whole evolution of Faial Island has been characterized by successive short volcanic pulses probably controlled by brief episodes of regional deformation. Each pulse has been separated by considerable periods of volcanic inactivity during which the Faial graben gradually developed. We propose that the volume loss associated with sudden magma extraction from a shallow reservoir in different episodes triggered incremental downward graben movement, as observed historically, when immediate vertical collapse of up to 2 m was observed along the western segments of the graben at the end of the Capelinhos eruptive crises (1957-58).

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Shelves surrounding reefless volcanic ocean islands are formed by surf erosion of their slopes during changing sea levels. Posterosional lava flows, if abundant, can cross the coastal cliffs and fill partially or completely the accommodation space left by erosion. In this study, multibeam bathymetry, high-resolution seismic reflection profiles, and sediment samples are used to characterize the morphology of the insular shelves adjacent to Pico Island. The data show offshore fresh lava flow morphologies, as well as an irregular basement beneath shelf sedimentary bodies and reduced shelf width adjacent to older volcanic edifices in Pico. These observations suggest that these shelves have been significantly filled by volcanic progradation and can thus be classified as rejuvenated. Despite the general volcanic infilling of the shelves around Pico, most of their edges are below the depth of the Last Glacial Maximum, revealing that at least parts of the island have subsided after the shelves formed by surf erosion. Prograding lava deltas reached the shelf edge in some areas triggering small slope failures, locally decreasing the shelf width and depth of their edges. These areas can represent a significant risk for the local population; hence, their identification can be useful for hazard assessment and contribute to wiser land use planning. Shelf and subaerial geomorphology, magnetic anomalies and crustal structure data of the two islands were also interpreted to reconstruct the long-term combined onshore and offshore evolution of the Faial-Pico ridge. The subaerial emergence of this ridge is apparently older than previously thought, i.e., before approximate to 850 ka.

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Trabalho de Projecto apresentado para cumprimento dos requisitos necessários à obtenção do grau de Mestre em Património Artístico

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O presente Relatório de Estágio enquadra-se numa abordagem descritiva e reflexiva da ação educativa de um percurso experienciado em dois contextos escolares diferentes, o 1.º Ciclo do Ensino Básico, com crianças com idades compreendidas entre os sete e os oito anos, e a Educação Pré-Escolar, com idades entre os três e os seis anos, inserido no 2.º ano de Mestrado em Educação Pré-Escolar e Ensino do 1.º Ciclo do Ensino Básico. Para a realização deste, procedeu-se à consulta de pressupostos teóricos que sustentaram as estratégias adotadas e à caracterização dos contextos em que se inseriram os estágios. O estágio foi sustentado numa metodologia de observação participante, com características de uma investigação-ação, adotando uma natureza qualitativa, que contribuíram para a construção de conhecimentos e pesquisa de respostas que se colocaram durante a ação. Para tal, recorreu-se a estratégias de ensino-aprendizagem, suportadas por planificações e reflexões críticas semanais, baseando-se nos instrumentos de recolha de dados (registos fotográficos, notas de campo reflexivas e descritivas, produções orais e escritas das crianças/alunos, conversas informais e análise de documentos), que sustentaram as opções pedagógicas utilizadas durante a intervenção, onde pôde-se verificar algumas inferências relativamente às características das crianças/alunos, assim como aos seus ritmos de aprendizagem. Após o termo da intervenção educativa, fez-se a avaliação geral do grupo/turma e, no caso da Educação Pré-Escolar, também de uma criança em particular, em que pôde-se constatar que a utilização de diferentes metodologias que considerem as crianças e atendem à sua participação, tiveram efeitos positivos no seu desenvolvimento e no sucesso das suas aprendizagens.

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Polissema: Revista de Letras do ISCAP 2002/N.º 2 Linguagens

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Dissertação de Mestrado, Estudos Integrados dos Oceanos, 3 de Maio 2012, Universidade dos Açores.

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Tese de Doutoramento, Geologia (Hidrogeologia), 17 de Dezembro de 2013, Universidade dos Açores.

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III Fórum Açoriano Franklin D. Roosevelt, "O Mar na Perspectiva da História, da Estratégia e da Ciência", Horta, Ilha do Faial de 27 a 29 de Abril de 2012.

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Conhecer o Mar dos Açores. Fórum Científico de Apoio à Decisão, Horta, 19 de Janeiro de 2011.

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"Conhecer o Mar dos Açores III - Fórum científico de apoio à decisão". Biblioteca Pública e Arquivo Regional João José da Graça, Horta, Faial, Açores, 19-20 de setembro de 2013.