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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Earth structure and instrumental seismicity of Madagascar: Implications on the seismotectonics
Tectonophysics, Volume 594, Year 2013
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Description
The aim of this study is to improve the knowledge of the seismotectonics of Madagascar. We first investigate the structure of the Earth beneath Madagascar through the joint inversion of receiver functions and Rayleigh wave group velocities. Then we use the obtained velocity models to relocate local earthquakes in order to analyse the distribution of seismicity. Finally, we use structural models and earthquake coordinates to compute focal mechanisms. Our retrieved Earth structure models confirm a thin lithosphere beneath Madagascar when compared to the nearby East African Rift. The High Plateau in the Central region coincides with the thinnest lithosphere over the slowest asthenosphere. Our results are in good agreement with the gravity anomalies and likely confirm a localised asthenospheric upwelling beneath the central part of Madagascar. The surface expression of the asthenospheric upwelling consists in a horst-graben structure. The moderate seismicity is localised along pre-existing structures reflecting an E-W extension that is mostly accommodated in the lower crust. © 2013 Elsevier B.V.
Authors & Co-Authors
Rindraharisaona, Elisa Josiane
Italy, Trieste
Abdus Salam International Centre for Theoretical Physics
Madagascar, Antananarivo
Institute and Observatory of Geophysics Antananarivo
Guidarelli, Mariangela
Italy, Trieste
Abdus Salam International Centre for Theoretical Physics
Aoudia, Abdelkrim
Italy, Trieste
Abdus Salam International Centre for Theoretical Physics
Rambolamanana, Gérard
Madagascar, Antananarivo
Institute and Observatory of Geophysics Antananarivo
Statistics
Citations: 26
Authors: 4
Affiliations: 2
Identifiers
Doi:
10.1016/j.tecto.2013.03.033
ISSN:
00401951
Study Locations
Madagascar