The 3D Attenuation Structure of Deception Island (Antarctica)

Janire Prudencio, Luca De Siena (Corresponding Author), Jesus Ibanez, Edoardo Del Pezzo, Araceli Garcia-Yeguas, Alejandro Diaz-Moreno

Research output: Contribution to journalArticle

27 Citations (Scopus)
5 Downloads (Pure)

Abstract

The seismic and volcanological structure of Deception Island (Antarctica) is an intense focus topic in Volcano Geophysics. The interpretations given by scientists on the origin, nature, and location of the structures buried under the island strongly diverge. We present a high-resolution 3D P-wave attenuation tomography model obtained by using the coda normalization method on 20,293 high-quality waveforms produced by active sources. The checkerboard and synthetic anomaly tests guarantee the reproduction of the input anomalies under the island down to a depth of 4 km. The results, once compared with our current knowledge on the geological, geochemical, and geophysical structure of the region, depict Deception as a piecemeal caldera structure coming out of the Bransfield Trough. High-attenuation anomalies contouring the northeastern emerged caldera rim correlate with the locations of sediments. In our interpretation, the main attenuation contrast, which appears under the collapsed southeastern caldera rim, is related to the deeper feeding systems. A unique P-wave high-attenuation spherical-like anomaly in the inner bay extends between
depths of 1 and 3 km. The northern contour of the anomaly coincides with the calderic rim both at 1 and 2 km, while smaller anomalies connect it with deeper structures below 3 km, dipping toward the Bransfield Trough. In our interpretation, the large upper anomaly is caused by a high-temperature shallow (1–3 km deep) geothermal system, located beneath the sediment-filled bay in the collapsed blocks and heated by smaller, deeper contributions of molten materials (magma) rising from southeast.
Original languageEnglish
Pages (from-to)371-390
Number of pages20
JournalSurveys in Geophysics
Volume36
Issue number3
Early online date14 Mar 2015
DOIs
Publication statusPublished - May 2015

Keywords

  • Attenuation
  • Scattering
  • tomography
  • Antarctica

ASJC Scopus subject areas

  • Geophysics
  • Geology

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    Prudencio, J., De Siena, L., Ibanez, J., Del Pezzo, E., Garcia-Yeguas, A., & Diaz-Moreno, A. (2015). The 3D Attenuation Structure of Deception Island (Antarctica). Surveys in Geophysics, 36(3), 371-390. https://doi.org/10.1007/s10712-015-9322-6