6 documents found, page 1 of 1
The Portuguese National Seismic Network —Products and Services
Carrilho, F.; Custodio, S.; Bezzeghoud, M.; Oliveira, C. S.; Marreiros, C.; Vales, D.; Alves, P.; Pena, A.; Madureira, G.; Escuer, M.; Silveira, G.Portugal, located in the southwest region of the Eurasian plate, has been affected by several destructive earthquakes throughout its history, the most well-known being the 1755 Great Lisbon earthquake. The seismicity of the territory, both in the mainland and in the Azores and Madeira islands, has prompted the continuous development of seis- mic monitoring, from the first known macroseismic inquiry, following t...
Deep structure of the North Natal Valley (Mozambique) using combined wide-angle...
Lepretre, A.; Schnurle, P.; Evain, Mikael; Verrier, F.; Moorcroft, D.; Clarens, P. de; Corela, C.; Afilhado, Alexandra; Loureiro, Afonso; LEROY, SylvieThe North Natal Valley (NNV) and the Mozambique Coastal Plain (MCP) are key areas for the understanding of the SW Indian Ocean history since the Gondwana break-up. Nevertheless, the deep structures and the nature of the NNV and MCP remain discussed in the absence of deep geophysical data. In 2016, the NNV, MCP and Limpopo margin (LM) have been investigated along seven wide-angle and MCS profiles. The combined w...
Imaging exhumed lower continental crust in the distal Jequitinhonha basin, Brazil
Loureiro, Afonso; Schnürle, P.; Klingelhoefer, Frauke; Afilhado, Alexandra; Pinheiro, J.; Evain, Mikael; Gallais, F.; Dias, Nuno; Rabineau, MarinaTwelve combined wide-angle refraction and coincident multi-channel seismic profiles were acquired in the Jequitinhonha-Camamu-Almada, Jacuípe, and Sergipe-Alagoas basins, NE Brazil, during the SALSA experiment in 2014. Profiles SL11 and SL12 image the Jequitinhonha basin, perpendicularly to the coast, with 15 and 11 four-channel ocean-bottom seismometers, respectively. Profile SL10 runs parallel to the coast, c...
Deep structure of the Santos basin-São Paulo plateau system, SE Brazil
Evain, M.; Afilhado, Alexandra; Rigoti, C.; Loureiro, A.; Alves, D.; Klingelhoefer, Frauke; Schnurle, Philippe; Feld, Aurelie; Fuck, R; Soares, J.The structure and nature of the crust underlying the Santos Basin-São Paulo Plateau System (SSPS), in the SE Brazilian margin, are discussed based on five wide-angle seismic profiles acquired during the Santos Basin (SanBa) experiment in 2011. Velocity models allow us to precisely divide the SSPS in six domains from unthinned continental crust (Domain CC) to normal oceanic crust (Domain OC). A seventh domain (D...
Ambient Noise Recorded by a Dense Broadband Seismic Deployment in Western Iberia
Custodio, S.; Dias, N. A.; Caldeira, B.; Carrilho, F.; Carvalho, Sara; Corela, C.; Diaz, J.; Narciso, J.; Madureira, G.; Matias, L.; Haberland, C.The West Iberia Lithosphere and Asthenosphere Structure (WILAS) project densely covered Portugal with broadband seismic stations for 2 yrs. Here we provide an overview of the deployment, and we characterize the network ambient noise and its sources. After explaining quality control, which includes the assessment of sensor orientation, we characterize the background noise in the short‐period (SP), microseismic, ...
Seismic Tomography of the Algarve Crust: Previous studies, Campaign and first data
Caldeira, Bento; Bezzeghoud, Mourad; Borges, José F.; Matias, L.; Rocha, João P.; Madureira, G.; Araújo, A.; Corela, C.; Carrilho, F.The Local Earthquake Tomography of Algarve (Portugal), the main objective of this project, will permit produces detailed images of the Algarve crust lithosphere and the mantle in terms ofseismic body waves velocity variations (Teleseismic Tomography) or absolutes velocities (Local Earthquake Tomography, LET). Through the LET of Monchique-Portimiio and Louli-Faro we expect to obtain a more detailed understanding...