Joining kernel-dependent seismic coda-attenuation imaging with geology and geomorphology of Deception Island, Antarctica: a unique interpretational framework using GIS

GUARDO R.; - CASELLI, A.T.

Concepción

Congreso; . XV Congreso Geológico Chileno; 2018

Universidad Concepción

Deception Island is the most active and documented volcano in the Bransfield Strait (Antarctica). It is located between theAntarctic Peninsula and the South Shetland Islands, in a region that span from -62.889 to -63.025 degree latitude South andfrom -60.754 to -60.490 degree longitude West, in an area of about 202 km2. The subareal portion of the volcano, shaped like asmall horseshoe, surround an inner bay (Port Foster) with a diameter of about 15 km. Since its last eruption (dated back 1970)several experiments, spanning from the geochemicals ones to the satellite analysis, have targeted an improved reconstruction ofits magmatic systems. Among all these experiments, the geophysical imaging has provided new insight into Deception´s interior,particularly when using space-weighted seismic attenuation tomography for coda waves. In this study, we apply sensitivitykernels and a novel inversion strategy to obtain a frequency-dependent model of the magmatic systems at Deception Island. Theapplication of this techinique, using active data (from the TOMODEC experiment conducted in 2005), where particular care hasbeen put on data selection and model optimisation, in the framework of a Geographic Information System offer results that havebeen framed in the extensive knowledge of the geology and the geomorphology of the volcano. This inter- and multi-disciplinaryanalysis will become a tool to imporve the interpretation of the dynamics of Deception Island and sit related hazards.