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Authors: Beranzoli, L.*
De Santis, A.*
Calcara, M.*
Ciafardini, A.*
De Caro, M.*
Favali, P.*
Frugoni, F.*
Iafolla, V.*
Lo Bue, N.*
Marinaro, G.*
Monna, S.*
Montuori, C.*
Qamili, E.*
Sgroi, T.*
Vitale, S.*
Title: Multiparametric seafloor exploration: the Marsili Basin and Volcanic Seamount case (Tyrrhenian Sea, Italy)
Editors: Trilling, L.; Massachussets Institute of Technology (MIT), USA
Perkins, D.; Harvard University, USA
Dionysiou, D. D.; University of Cincinnati, USA
Perlovsky, L.; Harvard University, USA
Davey, K.; IEEE Fellow, Editor IEEE Trans. on Magnetics, Austin, TX, USA
Landgrebe, D.; Purdue University, USA
Marino, M. A.; Civil & Environmental Eng., and Biological & Agricultural Engineering, University of California, CA, USA
Russell, D. L.; Virginia Tech., USA
Collicott, S. H.; School of Aeronautics and Astronautics, Univ. West Lafayette, USA
Ceccarelli, M.; University of Cassino, IT
Lund, J. W.; Oregon Institute of Technology, USA
Issue Date: 24-Feb-2009
Keywords: Marsili Basin and Volcanic Seamount
Exploration with seafloor observatories
Abstract: Exploration of ocean seafloor is of paramount importance for a better understanding of the geodynamic evolution of our Planet. The pilot experiment of ORION-GEOSTAR 3 EC project was the first long-term continuous geophysical and oceanographic experiment of an important seafloor area of Southern Tyrrhenian Sea, the Marsili abyssal plain. The latter hosts the Marsili Seamount which is Europe’s one of the largest underwater volcano of Plio-Pleistocenic age. In spite of its dimensions, it is rather unknown about the present characteristics and activity. For this reason, we deployed a deep-sea observatory network, composed by two bottom observatories, on the seafloor at the base of the seamount at 3320 m b.s.l., in the period December 2003-May 2005. Some of the instruments on board the observatory were: broad-band seismometers, hydrophones, gravity meter, two magnetometers (scalar and vectorial), 3D single-point current meter, ADCP, CTD, automatic pH analyser and off-line water sampler for laboratory analyses. The first successful scientific objective was to obtain long-term continuous recordings under a unique time reference. The data analysis shows that they are generally of good quality and really continuous (only a few gaps). As a first step we performed a classification of seismic waveforms, a first inversion of magnetic variational data, and a first analysis of gravity meter, chemical and oceanographic data. Analysis of individual time series has shown interesting results, i.e. depth of the magnetic Moho under the Marsili, attenuation of recorded seismic body waves and clues of hydrothermal circulation. We show examples of the preliminary data analysis together with first results and comparisons among data coming from different sensors.
Appears in Collections:03.01.01. Analytical and numerical modeling
Conference materials
04.02.07. Instruments and techniques

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