Encontrados 49 documentos, a visualizar página 1 de 5
Seismic rupture process of the 2010 Haiti Earthquake (Mw7.0) inferred from seis...
Santos, R.; Caldeira, B.; Borges, J.F.; Bezzeghoud, M.On January 12th 2010 at 21:53, the Port-au-Prince – Haiti region was struck by an Mw7 earthquake, the second most deadly of the history. The last seismic significant events in the region occurred in November 1751 and June 1770 [1]. Geodetic and geological studies, previous to the 2010 earthquake [2] have warned to the potential of the destructive seismic events in that region and this event has confirmed those ...
Observações de planetas extrasolares no Observatório Astronómico da Ribeira Gra...
Pereira Santos, N.P.; Bezzeghoud, M.; Caldeira, B.; Santos, N.C.; Santana, M.O estudo dos planetas extra-solares tem sido uma das áreas em maior actividade na Astronomia e inclusivamente tem impulsionado estudos em áreas como a Geofísica, para uma melhor compreensão da origem e evolução dos planetas. O projecto TRANSIT, do Centro de Geofísica de Évora, desenvolve uma campanha de acompanhamento de trânsitos de planetas extra-solares, utilizando o Observatório Astronómico da Ribeira Grand...
Aplicação do Radar de Penetração no Solo (GPR) na detecção de estruturas no âmb...
Lourenço, V.; Caldeira, B.; Rocha, J.; Bezzeghoud, M.; Borges, J.F.Na base do fulgurante desenvolvimento da ciência forense está a incorporação do conhecimento e técnicas de várias especialidades científicas, onde a física ocupa lugar de relevo. Um exemplo desta articulação é o GPR (Ground Penetrating Radar, Radar de Penetração no Solo), que assume hoje grande importância na detecção de objectos e cadáveres enterrados. Este trabalho descreve um estudo sobre os limites de aplic...
Seismicity of Azores and Geodynamic implications
Borges, J.F.; Bezzeghoud, M.; Caldeira, B.Over the past thirty years, several seismological studies have been carried out in the Azores region in order to characterize the geodynamic complexity of this region. In this work, we summarize these studies and highlight their main conclusions. The analysis of the focal mechanisms of large earthquakes reveals that there are two zones in the Azores, namely, zones I and II, with different stress pattern and str...
Extended Seismic Source Characterisation using Linear Programming Inversion in ...
Caldeira, B.; Borges, J.F.; Bezzeghoud, M.; Bushenkov, V.; Smirnov, G.A linear programming (LP) inversion method in a dual formulation was applied to reconstruct the kinematics of finite seismic ruptures. In a general setting, this approach can yield results from several data sets: strong ground motion, teleseismic waveforms or/and geodesic data (static deformation). The dual formulation involves the transformation of a normal solution space into an equivalent but reduced space: ...
Validation of the Lower Tagus Valley velocity and structural model using ambien...
Torres, R.J.G.; Furtado, J.A.; Borges, J.F.; Caldeira, B.; Bezzeghoud, M.; Pinto, C.C.; Carvalho, J.Along his history the Lower Tagus Valley (LTV) region was shaken by several earthquakes, some of them were produced in large ruptures of offshore structures located southwest of the Portuguese coastline, among these we the Lisbon earthquake of 1 November 1755; other moderates earthquakes were produced by local sources such as the 1344, 1531 and the 1909 Benavente earthquake. In order to promote an improved asse...
Seismicity along the western part of the Eurasia-Nubian plate boundary
Bezzeghoud, M.; Adam, C.; Buforn, E.; Borges, J.F.; Caldeira, B.The seismicity along the western part of the Eurasia-Nubian plate boundary is characterized by a very complex pattern. In average, the motion is transtensional in the Azores, dextral along the Gloria transform zone and convergent between the SW Portuguese Atlantic margin and the Ibero-Maghrebian zone. To constraint the factors controlling the seismicity, we provide a new seismotectonic synthesis using several s...
Improving the Knowledge on Seismogenic Sources in the Lower Tagus Valley for Se...
Carvalho, J.; Pinto, C. C.; Rabeh, T; Borges, J. F.; Dias, R.; Costa, M.; Duarte, H.; Terrinha, P.; Caldeira, B.The Lower Tagus Valley, that includes the metropolitan area of Lisbon, has been struck by several earthquakes which produced significant material damage and loss of lives. Their exact location remains unknown. Our goal is to shed some light into the seismogenic sources in the area using seismic reflection and geological data. In areas with no seismic coverage, potential-field data interpretation was carried out...
On the determination of the earthquake slip distribution via linear programming...
Bushenkov, V.; Caldeira, B.; Smirnov, G.The description that one can have of the seismic source is the mani- festation of an imagined model, obviously outlined from Physic Theories and supported by mathematical methods. In that context, the modelling of earthquake rupture consists in finding values of the parameters of the selected physics-mathematical model, through which it becomes possible to reproduce numerically the records of earthquake effects...
CGE: da divulgação à investigação
Dias, R; Caldeira, B.; Machado, I.A divulgação da ciência e da tecnologia aparece como uma área fundamental na sociedade actual. Isto não será de estranhar pois os tremendos desafios que se colocam ao futuro de um planeta que a cada 12 a 13 anos tem mais mil milhões de habitantes e onde o consumo aumenta de uma forma exponencial, levanta problemas que eventualmente só o conhecimento científico poderá resolver; é importante que as opções que ven...
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