Linha de Pesquisa: Sismologia

Descrição: Sismologia, monitora e estuda a sismicidade regional e local do Nordeste mediante instalação de redes sismográficas locais em áreas afetadas por tremores e regionais para identificação de fontes sísmicas; registros de telessismos são utilizados para determinação de estrutura da crosta e manto. Seismology, monitoring and research of local and regional seismic events with seismographic networks, crustal structure using receiver function of teleseismic events, crust and mantle tomography.
Área: Sismicidade
Instituição: UnB
Departamento: Observatório Sismológico SIS/UnB
Palavras-Chave:

Publicações relacionadas

Imagem de capa do card

Autores:

Tipo: article

Linha de Pesquisa: Sismologia

DOI:

Descrição:

PDF
Imagem de capa do card
Lithospheric structure of the southern Amazonian Craton from multiple-frequency seismic tomography: Preliminary insights on tectonic and metallogenic implications

Autores: Costa, Iago Sousa Lima Rocha, Marcelo Peres Klein, Evandro Luiz Vasquez, Marcelo Lacerda

Tipo: article

Linha de Pesquisa: Sismologia

DOI: 10.1016/j.jsames.2020.102608

Descrição: We present a P-wave structure for the sub-continental lithospheric mantle (SCLM) beneath the southern segment of the Amazonian Craton (Central Brazil Shield – CBS) using multiple-frequency tomography. Our model includes 469 seismic events recorded between 2009 and 2017 through 314 seismic stations distributed over South America. From these events, we obtained 20507 P and 12329 PKIKP cross-correlation delays in six frequency bands centered at 0.03, 0.06, 0.13, 0.25, 0.5 and 1 Hz. Despite the limited and heterogeneous resolution throughout the CBS, because of the difficulty in the installation of seismographic stations in areas of dense coverage of tropical forest, our tests show reasonable resolution for lithospheric domains with dimensions greater than 390 × 390 km in most of the study area. We recognized a good correlation between the P-wave anomalies and the tectonic domains defined previously based on geochronology and geological data. The surface projection of these anomalies and their margins are associated with clusters of important Au, Cu–Au and IOCG deposits, as well as diamond-bearing kimberlite intrusions, allowing relating deep structures with shallow features and showing a province-scale control in the distribution of mineral deposits and occurrences in the southern Amazonian craton.

PDF

Usuários vinculados à linha de pesquisa


Imagem de capa do card
Susanne Maciel

Professor(a) e Pesquisador(a)

Ver Perfil

Imagem de capa do card
Susanne Maciel

Professor(a) e Pesquisador(a)

Ver Perfil

Imagem de capa do card
Marcelo Peres Rocha

Professor(a) e Pesquisador(a)

Ver Perfil

Observatório Sismológico da Universidade de Brasília - SIS/UnB © Todos os direitos reservados - 2022