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Seismic ground motion scenarios in Lower Tagus Valley Basin
Borges, J. F.; Torres, Ricardo; Furtado, Augusto; Silva, Hugo; Bezzeghoud, Mourad; Caldeira, Bento; Pinto, CarlosThroughout its history the Lower Tagus Valley (LTV) has been struck by several earthquakes which produced important material damage and loss of lives: The 1st of November 1755 Lisbon earthquake and the 1969 earthquake (Mw=7.3), located in the SW Iberia Margin and the 1344, 1531 and 1909 (M= 6 to 7) with epicenter located inside the LTV basin. Since this region is the most highly populated region in Portugal, it...
Site-condition map for Portugal based on Vs30 values and evaluation of the appl...
Narciso, João; Vilanova, Susana; Carvalho, João; Pinto, Carlos; Lopes, Isabel; Nemser, Eliza; Oliveira, Carlos Sousa; Borges, J. F.Maps providing information on site conditions are essential tools to accurately represent the spatial distribution of ground motions, both in seismic hazard maps and in instrumental intensity maps (ShakeMaps). Project SCENE, funded by the Portuguese Foundation for Science and Technology, aims at characterizing the site conditions for Portugal and to outline a first-order site effects map to be used in seismic h...
Earthquake Mitigation in the Lisbon and Lower Tagus Valley area, Portugal
Carvalho, J. F.; Dias, J.; Pinto, Carlos; Cunha, T; Leote, J.; Vilanova, S.; Borges, J. F.; Ghose, R.; Narciso, J.The capital city of Lisbon and the Lower Tagus Valley region of central Portugal mainland are located in the Eurasian plate about 350 Km from the approximately E-W oriented Eurasia-Africa plate boundary. It is characterized by low slip-rates (<0.4 mm/year) and a moderate seismicity, occasionally shaken by some important historical earthquakes causing significant damages and economical losses. The most well know...
Optimal representation of our knowledge about seismic sources for PSHA in low d...
Le Goff, Boris; Bezzeghoud, Mourad; Borges, J F.; Fitzenz, D.characterization of the seismic sources, the definition of the attenuation law and the computation of the probabilistic seismic hazard. Our work is focus on the first two steps. Given that most active faults are not characterized well enough, in low deformation areas, seismic sources are generally defined as areal zones, delimited with finite boundary polygons, within which the geological features of active tec...
Estudo da fonte do sismo do Haiti de 12 de janeiro de 2010 a partir de combinaç...
Santos, R.J.G.; Borges, J. F.; Caldeira, Bento; Bezzeghoud, MouradNeste trabalho é apresentada uma metodologia baseada no cruzamento de técnicas e dados sísmicos (ondas de volume com registo telessísmico por estações de banda larga) e geodésicos (SAR - Radar de Abertura Sintética) com o intuito de estudar o complexo processo de ruptura do sismo do Haiti de 12 de Janeiro de 2010. Esta metodologia baseia-se: 1) na análise da diretividade para estimar a direção e a velocidade mé...
Earthquake Mitigation in the Lisbon and Lower Tagus Valley area, Portugal
Carvalho, J.; Dias, R.; Pinto, C.; Cunha, T.; Leote, J.; Vilanova, S.; Narciso, J.; Borges, J. F.; Ghose, R.J.G.The capital city of Lisbon and the Lower Tagus Valley region of central Portugal mainland are located in the Eurasian plate about 350 Km from the approximately E-W oriented Eurasia-Africa plate boundary. It is characterized by low slip-rates (<0.4 mm/year) and a moderate seismicity, occasionally shaken by some important historical earthquakes causing significant damages and economical losses. The most well know...
Intensity-distance attenuation law in the continental Portugal using intensity ...
Le Goff, Boris; Bezzegohoud, Mourad; Borges, J. F.Several attempts have been done to evaluate the intensity attenuation with the epicentral distance in the Iberian Peninsula [1, 2]. So far, the results are not satisfying or not using the intensity data points of the available events. We developed a new intensity law for the continental Portugal, using the macroseismic reports that provide in- tensity data points, instrumental magnitudes and instrumental locati...
Vs30 estimation using ambient vibrations and seismic refraction experiments - A...
Teves-Costa, P; Rodrigues, I.; Torres, R.J.G.; Carvalho, J.; Almeida, I.M.; Borges, J. F.The town of Lisbon has been affected by several strong earthquakes in the past originated either offshore or inland. The main inland seismogenic zone is the Lower Tagus Valley (LTV) region oriented NNE-SSW and reaching the northern part of Lisbon at its southern end. It is composed by a system of faults mainly oriented according to the valley trend, but the identification of the particular seismogenic structure...
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 ...
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...
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