Active tectonics, fault patterns, and stress field of Deception Island: A response to oblique convergence between the Pacific and Antarctic plates

Maestro, Adolfo; Somoza, Luı́s; Rey, J.; Martínez‐Frías, Jesús; López-Martı́nez, Jerónimo

doi:10.1016/j.jsames.2006.09.023

Cited by 51 publications

(74 citation statements)

References 43 publications

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“…From this analysis, we have established two strain fields at Deception Island ( González-Casado et al, Maestro et al, 2007). 2-Secondary uniaxial extension, probably related to the caldera collapse.…”

Section: Strain Analysismentioning

confidence: 98%

“…(e.g., Rey et al, 1995;Smellie, 2002;González-Casado et al, 1999Fernández-Ibáñez et al, 2005;Maestro et al, 2007;amongst others), propose two tectonic models: (1) A complex Riedel model under strike-slip stress regime (Maestro et al, 2007), (2) lithospheric thinning within an extensional strain regime with left-lateral component (ey NE-SW) and uniaxial extension probably related with the caldera collapse (ey NW-SE trending) .…”

Section: Introductionmentioning

confidence: 99%

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Active tectonics on Deception Island (West-Antarctica): A new approach by using the fractal anisotropy of lineaments, fault slip measurements and the caldera collapse shape

et al. 2007

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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 in the area: (1) field measurements of faults (strain analysis), (2) fractal geometry of the spatial distribution of lineaments and (3) the caldera shape (stress analyses). 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 S HMAX oriented NE-SW. The elliptical caldera of Deception Island, determined from field mapping, satellite imagery, vents and fissure eruptions, has an elongate shape and a stress field with S HMAX trending NE-SW.

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Section: Strain Analysismentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Active tectonics on Deception Island (West-Antarctica): A new approach by using the fractal anisotropy of lineaments, fault slip measurements and the caldera collapse shape

et al. 2007

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“…Las últimas erupciones en la isla tuvieron lugar entre 1967 y 1970, y aún hoy en día persiste una importante actividad geotermal, fumarólica y sísmi-ca (Ibañez et al, 2003;Almendros et al, 2004). Su origen está relacionado con un sistema de fracturas en el fondo oceánico, a más de 850 m bajo la superficie, de dirección SW-NE en el llamado Arco de Scotia (Hawkes, 1962;Baker et al, 1975;Grad et al, 1992;Rey y Somoza, 1992;Rey et al, 1995;González-Casado et al, 2000;Somoza et al, 2004;Maestro et al, 2007). Todos los materiales presentes en la isla tienen un origen volcánico, hidrotermal o volcanoclástico por la modificación de los dos primeros (Smellie, 2001.…”

Section: Geología Y Geomorfologíaunclassified

Study of the active layer at the Spanish Antarctic station “Gabriel de Castilla”, Deception Island, Antarctica

Pablo¹,

Molina²,

Récio³

et al. 2017

Bol. geol. min.

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“…Subaerial fumaroles and underwater degassing sites are common in several areas on and offshore at Deception Island (Grad et al, 1992;Acosta and Uchupi, 1996;Smellie and López-Martínez, 2000). A regional tectonic extension is traditionally suggested to explain these sequences of volcanic and hydrothermal events (Rey et al, 1995) and the structural lineament directions inside the island control the eruption's places and the main geomorphological features (Maestro et al, 2007). Besides, these structural patterns also restrict present fumaroles and anomalous ground temperature locations.…”

Section: Regional Settingmentioning

confidence: 99%

Local influences of geothermal anomalies on permafrost distribution in an active volcanic island (Deception Island, Antarctica)

et al. 2014

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This study aims at understanding the spatial distribution and characteristics of the frozen and unfrozen terrain in an alluvial fan on Deception Island, which is an active strato-volcano located in the Bransfield Strait (South Shetland Islands) with recent eruptions in 1967, 1969 and 1970. The alluvial fan is dominated by debris-flow, run-off and rock fall processes and permafrost occurs in several parts in the vicinity of anomalous geothermal heat flux. The aim is to assess the ways volcanic activity controls permafrost development and associated geomorphic dynamics using shallow subsurface, surface and air temperature measurements as well as thaw depth and electrical resistivity tomography (ERT) surveys. Results show a temperature increase with depth in the lower part of the fan reaching 13°C at 0.80 m depth, without the presence of permafrost. The shallow borehole located at this site showed a stable thermal stratification all year-round, with only the upper 0.20 m reacting to meteorological forcing. In the upper part of the alluvial fan and debris cones, c. 100 m from the coast, frozen ground is present at c. 0.70 m depth. There, the shallow borehole shows a good coupling with air temperatures and the thermal regime favours the presence of permafrost. ERT shows the lowest resistivity values in the lower part of the alluvial fan and a highly resistivity zone in the upper sector of the fan and in the debris cones. These large variations in resistivity mark the presence of a saline water wedge from the sea into the fan, reaching frozen ground conditions about 100 m inland. It can be shown that the volcano-hydrothermal activity only inhibits frost development very locally, with frozen ground conditions occurring about 100 m away.

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Active tectonics, fault patterns, and stress field of Deception Island: A response to oblique convergence between the Pacific and Antarctic plates

Cited by 51 publications

References 43 publications

Active tectonics on Deception Island (West-Antarctica): A new approach by using the fractal anisotropy of lineaments, fault slip measurements and the caldera collapse shape

Active tectonics on Deception Island (West-Antarctica): A new approach by using the fractal anisotropy of lineaments, fault slip measurements and the caldera collapse shape

Study of the active layer at the Spanish Antarctic station “Gabriel de Castilla”, Deception Island, Antarctica

Local influences of geothermal anomalies on permafrost distribution in an active volcanic island (Deception Island, Antarctica)

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