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

Friday, 19 December 2014
Félicie Korostelev1, Cornelis Weemstra2, Lapo Boschi3,4, Sylvie D Leroy5, Yong Ren6, Graham William Stuart6, Derek Keir7, Frederique Rolandone5, Abdulhakim Ahmed1, Ismail Al Ganad8, Khaled Khanbari9, Cecile Doubre10, James O S Hammond11 and J Michael Kendall12, (1)ISTeP Institut des Sciences de la Terre de Paris, Paris Cedex 05, France, (2)ETH Zurich, Zurich, Switzerland, (3)CNRS, Institut des Sciences de la Terre Paris (iSTeP), Paris, France, (4)Sorbonne Universités, UPMC Université Paris 6, Paris, France, (5)University Pierre and Marie Curie Paris VI, Paris, France, (6)University of Leeds, Leeds, United Kingdom, (7)University of Southampton, Southampton, United Kingdom, (8)Yemen Geological Survey and mineral Resources Board, Sana'a, Yemen, (9)Sana'a University, Sana'a, Yemen, (10)University of Strasbourg, Strasbourg Cedex, France, (11)Imperial College London, London, SW7, United Kingdom, (12)University of Bristol, Bristol, BS8, United Kingdom
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.