Crustal Structure of the Gulf of Aden Continental Margins, from Afar to Oman, by Ambient Noise Seismic Tomography

Félicie Korostelev, Sorbonne Université, ISTeP Institut des Sciences de la Terre de Paris, Paris Cedex 05, France, Cornelis Weemstra, ETH Zurich, Zurich, Switzerland, Lapo Boschi, CNRS, Institut des Sciences de la Terre Paris (iSTeP), Paris, France; Sorbonne Universités, ISTeP Institut des sciences de la Terre de Paris, Paris, France, Sylvie D Leroy, University Pierre and Marie Curie Paris VI, Paris, France, Yong Ren, University of Leeds, Leeds, United Kingdom, Graham William Stuart, University of Leeds, School of Earth and Environment, Leeds, United Kingdom, Derek Keir, University of Southampton, Ocean and Earth Sciences, Southampton, United Kingdom, Frederique Rolandone, Sorbonne Université, CNRS-INSU, Institut des Sciences de la Terre de Paris, Paris, France, Abdulhakim Ahmed, ISTeP Institut des Sciences de la Terre de Paris, Paris Cedex 05, France, Ismail Al Ganad, Yemen Geological Survey and mineral Resources Board, Sana'a, Yemen, Khaled Mohamed Khanbari, Sana'a University, Sana'a, Yemen, Cecile Doubre, Université de Strasbourg, IPGS, École et Observatoire des Sciences de la Terre, Strasbourg, France, James O S Hammond, Imperial College London, London, United Kingdom and J Michael Kendall, University of Oxford, Department of Earth Sciences, Oxford, United Kingdom
Abstract:
Continental rupture processes under mantle plume influence are still poorly known although extensively studied. The Gulf of Aden presents volcanic margins to the west, where they are influenced by the Afar hotspot, and non volcanic margins east of longitude 46° E. We imaged the crustal structure of the Gulf of Aden continental margins from Afar to Oman to evaluate the role of the Afar plume on the evolution of the passive margin and its extent towards the East. We use Ambient Noise Seismic Tomography to better understand the architecture and processes along the Gulf of Aden. This recent method, developed in the last decade, allows us to study the seismic signal propagating between two seismic stations. Ambient Noise Seismic Tomography is thus free from artifacts related to the distribution of earthquakes. We collected continuous records from about 200 permanent or temporary stations since 1999 to compute Rayleigh phase velocity maps over the Gulf of Aden.
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