A seafloor experiment to monitor vertical deformation at the Lucky Strike volcano, Mid-Atlantic Ridge |
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| Authors: | Valérie Ballu Jérome Ammann Olivier Pot Olivier de Viron Glenn S Sasagawa Gilles Reverdin Marie-Noelle Bouin Mathilde Cannat Christine Deplus Sébastien Deroussi Marcia Maia Michel Diament |
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| Institution: | (1) CNRS/Institut de Physique du Globe de Paris, Paris, France;(2) IRD/Géoazur, PO Box 336, Port-Vila, Vanuatu;(3) Paris 7/Institut de Physique du Globe de Paris, Paris, France;(4) IGPP/Scripps Institution of Oceanography, San Diego, CA, USA;(5) CNRS/LOCEAN, Paris, France;(6) IGN/LAREG, Marne-la-Vallée, France;(7) Present address: Meteo-France, Brest, France;(8) Institut de Physique du Globe de Paris, Paris, France;(9) CNRS/Université de Bretagne Occidentale, Brest, France |
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| Abstract: | Decades of cruise-based exploration have provided excellent snapshots of the structure of mid-ocean ridges and have revealed
that accretion is a mixture of steady-state and quantum events. Observatory-type studies are now needed to quantify the temporal
evolution of these systems. A multi-disciplinary seafloor observatory site is currently being set up at the Lucky Strike volcano,
in the axial valley of the slow spreading Mid-Atlantic ridge as a part of the MoMAR (monitoring of the Mid-Atlantic Ridge)
initiative. The aim of this observatory is to better understand the dynamics of the volcano and the hydrothermal vents hosted
at its summit as well as their plumbing systems. In August 2006, the GRAVILUCK cruise initiated an experiment to monitor the
deformation of Lucky Strike volcano. A geodetic network was installed, and seafloor pressure, gravity and magnetic data were
collected. In this paper, we present the method used to monitor volcanic deformation, which involves measuring relative depth
difference between points within a seafloor geodesy network. We show that, taking into account oceanographic variability and
measurement noise, the network should be able to detect vertical deformations of the order of 1 cm. |
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| Keywords: | Seafloor Geodesy Deformation MoMAR Volcano Pressure |
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