Publication Date:
2020-05-29
Description:
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.
Description:
Published
Description:
Cambridge, UK, February 24-26, 2009
Description:
1.8. Osservazioni di geofisica ambientale
Description:
3.8. Geofisica per l'ambiente
Description:
open
Keywords:
Marsili Basin and Volcanic Seamount
;
Exploration with seafloor observatories
;
ORION-GEOSTAR 3 EC project
;
03. Hydrosphere::03.01. General::03.01.01. Analytical and numerical modeling
;
04. Solid Earth::04.02. Exploration geophysics::04.02.07. Instruments and techniques
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
Conference paper
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