| Summary: | Progress Code: completed Statement: The quality of data registered during the seismic experiment was very good, with low noise recorded by both on-land and ocean bottom seismometers. Due to the nature of the emplacement site, cultural noise was completely absent. The record quality decreased on on-land stations during high winds, and in OBS records when the sea waves were high. Purpose In January 2005 a multi-parametric international experiment was conducted that encompassed both Deception Island and its surrounding waters. This experiment used as main platforms the Spanish Oceanographic vessel 'Hesperides', the Spanish Scientific Antarctic base 'Gabriel de Castilla' at Deception Island and four temporary camps deployed on the volcanic island. This experiment allowed us to record active seismic signals on a large network of seismic stations that were deployed both on land and on the seafloor. In addition other geophysical data were acquired, such as: bathymetric high precision multi-beam data, and gravimetric and magnetic profiles. The seismic and bathymetric data have been analyzed but the magnetic and gravimetric data have not. We provide P-wave arrival-time picks and the seismic tomography results in velocity and attenuation. The data set presented in this article has been analyzed following different approaches and techniques providing new and interesting results associated with the nature and structure of the island. Tomographic and structural images of velocity and attenuation have been used to help in the interpretation of the inner structure of the volcano, sometimes combined with bathymetric analysis. The TOMO-DEC experiment was organized in three main legs: (1) a search for sites to deploy seismic stations and for temporary camps to accommodate the researchers (austral summer 2003-2004); (2) the field phase of data collection during the austral summer 2004-2005; and finally (3) a laboratory phase of data gathering, organization and analysis, that still ongoing as papers continue to be published. ...
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