Publication: Determinación del campo de esfuerzo/deformación activo en una isla volcánica a partir de técnicas fractales y estructurales
(Isla Decepción, Antártida Occidental)
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2008
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Sociedad Geológica de España.
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Abstract
En este trabajo se obtiene el campo de esfuerzo y deformación activo en la isla volcánica de Decepción, en la Antártida Occidental. Para ello, se han aplicado tres técnicas estructurales diferentes: (1) medida de planos de falla con vector de deslizamiento, (2) estudio de la geometría fractal de la distribución espacial de lineamientos en la isla, interpretados a partir de imágenes satélite y MDT de alta resolución y (3) cartografía y geometría de la caldera volcánica. El campo de deformación obtenido es de tipo extensional con dos orientaciones ortogonales para el máximo acortamiento horizontal (ey), NE-SO y NO-SE. El campo de esfuerzos obtenido mediante el análisis fractal y de la geometría de la caldera volcánica se define a partir de SHMAX según NE-SO.
The tectonic field on Deception Island (South Shetlands, West Antarctica) is determined from structural and fractal analyses. Three different analyses are applied to the study of the strain and stress fields into the area: (1) field measurements of faults (strain analysis), (2) fractal geometry of the spatial distribution of lineaments and (3) the caldera plan shape (stress analysis). In this work, the identified strain field is extensional with the maximum horizontal shortening trending NE-SW and NW-SE. The fractal technique applied to the spatial distribution of lineaments indicates a stress field with SHMAX oriented NE-SW. The elliptical caldera of Deception Island, determined from field mapping, satellite imagery and vents and fissure eruptions, has an elongate shape and a stress field with SHMAX trending NE-SW as well.
The tectonic field on Deception Island (South Shetlands, West Antarctica) is determined from structural and fractal analyses. Three different analyses are applied to the study of the strain and stress fields into the area: (1) field measurements of faults (strain analysis), (2) fractal geometry of the spatial distribution of lineaments and (3) the caldera plan shape (stress analysis). In this work, the identified strain field is extensional with the maximum horizontal shortening trending NE-SW and NW-SE. The fractal technique applied to the spatial distribution of lineaments indicates a stress field with SHMAX oriented NE-SW. The elliptical caldera of Deception Island, determined from field mapping, satellite imagery and vents and fissure eruptions, has an elongate shape and a stress field with SHMAX trending NE-SW as well.