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Title: Seismicity of Azores and Geodynamic implications
Authors: Borges, J.F.
Bezzeghoud, M.
Caldeira, B.
Editors: Silva, A.M.
Araújo, A.A.
Reis, A.H.
Morais, M.
Bezzeghoud, M.
Keywords: Seismicity
Focal Mechanisms
Seismic strain rates
Seismic moment tensor
Issue Date: 23-Nov-2012
Publisher: Universidade de Évora
Citation: Borges J. F., M. Bezzeghoud, B. Caldeira, 2012. Seismicity of Azores and Geodynamic implications. In “Two decades of earth science research”, A. M. Silva, A. A. Araújo, A. H. Reis, M. Morais, M. Bezzeghoud (eds), Universidade de Évora, Nov. 2012, iISBN: 78-989-95091-4-6, p. 79-92.
Abstract: 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 strain rates. In zone I, which is located between 30º W and 27º W, faulting motion corresponds to a left-lateral strike slip with horizontal E-W compression and N-S extension and a strain rate of 6.7 mm/yr. In zone II, which is located between 27º W and 23º W, the seismic moment tensor indicates normal faulting with horizontal NE-SW extension and a strain rate of 3.1 mm/yr..
ISBN: 78-989-95091-4-6
Type: bookPart
Appears in Collections:FIS - Publicações - Capítulos de Livros
CGE - Publicações - Capítulos de Livros

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