Angola seismicity

Francisco António Pereira Neto, George Sand França, Cristobal Condori Quispe, Giuliano Sant’Anna Marotta, Cristiano Naibert Chimpliganond

Research output: Contribution to journalArticlepeer-review

Abstract

This work describes the development of the Angolan earthquake catalog and seismicity distribution in the Southwestern African Plate, in Angola. This region is one of the least seismically active, even for stable continental regions (SCRs) in the world. The maximum known earthquake had a magnitude of 6.0 Ms, while events with magnitudes of 4.5 have return period of about 10 years. Events with magnitude 5 and above occur with return period of about 20 years. Five seismic zones can be confirmed in Angola, within and along craton edges and in the sedimentary basins including offshore. Overall, the exposed cratonic regions tend to have more earthquakes compared to other regions such as sedimentary basins. Earthquakes tend to occur in Archaic rocks, especially inside preexisting weakness zones and in tectonic-magmatic reactivation zones of Mesozoic and Meso-Cenozoic, associated with the installation of a wide variety of intrusive rocks, strongly marked by intense tectonism. This fact can be explained by the models of preexisting weakness zones and stress concentration near intersecting structures. The Angolan passive margin is also a new region where seismic activity occurs. Although clear differences are found between different areas along the passive margin, in the middle near Porto Amboim city, seismic activity is more frequent compared with northwestern and southwestern regions.

Original languageEnglish
Pages (from-to)1113-1126
Number of pages14
JournalJournal of Seismology
Volume22
Issue number5
DOIs
StatePublished - 1 Sep 2018
Externally publishedYes

Bibliographical note

Funding Information:
We thank anonymous referee for careful revision and positive criticism, which greatly improved our work. We also thank INAMET and GAMEL. GSF thanks CNPq for PQ grant 307255/2013-1. We would like to thank the reviewers and Chris Fianco to their insightful comments. Gabriel Brito de Fran?a for helping us translate this paper.

Funding Information:
Acknowledgements We thank anonymous referee for careful revision and positive criticism, which greatly improved our work. We also thank INAMET and GAMEL. GSF thanks CNPq for PQ grant 307255/2013-1. We would like to thank the reviewers and Chris Fianco to their insightful comments. Gabriel Brito de França for helping us translate this paper.

Publisher Copyright:
© 2018, Springer Science+Business Media B.V., part of Springer Nature.

Keywords

  • Angola earthquakes
  • Intraplate
  • Sedimentary basin
  • Stable continental regions

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