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Seismotectonics zoning of Morocco and adjacent region
Chourak, M.; Ait Brahim, L.; Bezzeghoud, M.; Tadili, B.A.; Pelaez, J.A.; Hamdache, M.; Casado, C.L.; Martínez Solares, J.M.In the present work, a new seismotectonics zoning of the Morocco and adjacent region is proposed. It is supported on a new database including recent geological (active faults, slip rates, geometrical characteristics, chronology of some recent tectonic phases) and geophysical (both instrumental and historical seismicity, focal mechanisms, nature of the crust) studies. In addition, the geodynamic context of the c...
The European VLF/LF Radio Network: Advances and Recent Results. Geophysical
Biagi, P.F.; Maggipinto, T.; Schiavulli, L.; Ligonzo, T.; Ermini, A.; Martinelli, G.; Moldovan, I.; Silva, H.; Bezzeghoud, M.; Contadakis, M.Since 2009 a network of VLF (20-60 kHz) and LF (150-300 kHz) radio receivers has been put into operation in Europe in order to study earthquakes precursors. At the moment the network consists of ten receivers three of which are located in Italy, two in Greece and one in Portugal, Romania, Malta, Cyprus and Turkey. The data (sampling rate of 1min) are downloaded automatically at the end of each day and are colle...
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 ...
Influence of seismic activity on the atmospheric electric field in Lisbon (Port...
Silva, H.G.; Oliveira, M.M.; Serrano, C.; Bezzeghoud, M.; Reis, A.H.; Rosa, R.N.; Biagi, F.In the present study, we considered the influence of seismic activity on the atmospheric electric field recorded at Portela meteorological station (Lisbon, Portugal) for the period from 1955 to 1991. To this end, an exploratory method was developed, which involved the selection of events for which the distance from the atmospheric electrical field sensor to the earthquake epicenter is smaller than the preparati...
Wavelet analysis of the LF radio signals collected by the European VLF/LF netwo...
Righetti, F.; Biagi, F.; Maggipinto, T.; Schiavulli, L.; Ligonzo, T.; Ermini, A.; Moldovan, I.A.; Moldovan, A.S.; Buyuksarac, A.; Silva, H.G.In 2008, a radio receiver that works in very low frequency (VLF; 20-60 kHz) and LF (150-300 kHz) bands was developed by an Italian factory. The receiver can monitor 10 frequencies distributed in these bands, with the measurement for each of them of the electric field intensity. Since 2009, to date, six of these radio receivers have been installed throughout Europe to establish a ‘European VLF/LF Network’. At pr...
Damage-based fracture with electro-magnetic coupling
Areias, P.; Silva, H.G.; Van Goethem, N.; Bezzeghoud, M.Acoupled elastic and electro-magnetic analysis is proposed including finite displacements and damage-based fracture. Piezo-electric terms are considered and resulting partial differential equations include a non-classical wave equation due to the specific constitutive law. The resulting wave equation is constrained and, in contrast with the traditional solutions of the decoupled classical electromagnetic wave e...
Anomalies Observed in VLF and LF Radio Signals on the Occasion of the Western T...
Biagi, F.; Righetti, F.; Maggipinto, T.; Schiavulli, L.; Ligonzo, T.; Ermini, A.; Moldovan, I.A.; Moldovan, A.S.; Silva, H.G.; Bezzeghoud, M.VLF radio signals lie in the 10 - 60 kHz frequency band. These radio signals are used for worldwide navigation support, time signals and for military purposes. They are propagated in the earth-ionosphere wave-guide mode along great circle propagation paths. So, their propaga-tion is strongly affected by the ionosphere conditions. LF signals lie in 150 - 300 kHz frequency band. They are used for long way broadca...
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...
VIAGEM AO INTERIOR DA TERRA
Bezzeghoud, M.Mais de 200.000 terramotos são registados e localizados à escala mundial cada ano. A monitorização sísmica à escala global, regional e local fornece informação que permite compreender a ocorrência dos sismos e, portanto, permite cartografar as regiões de alto e baixo risco sísmico. Densificação de redes sísmicas e técnicas avançadas da análise sísmica facilitaram a descoberta do até então desconhecidos fenómeno...
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