Distribución espacial y zonificación tectónica de los morfolineamientos en la Isla Decepción (Shetland del Sur, Antártida)

• Main Authors: Paredes, C., Pérez López, Rafael, Giner Robles, J. L., García García, Alicia, Vega, Rogelio de la, Gumiel Garrido, P.
• Format: Article in Journal/Newspaper
• Language: Spanish
• Published: Sociedad Geológica de España 2005
• Subjects: Fault map; Fractal; Tectonic zoning; Volcano; Deception Island; Antarctica; isla Decepción; Levy; Shetland del Sur; South Shetland Islands; Antarc*; Antártida
• Online Access: http://hdl.handle.net/10272/8655

Deception Island (South Shetland Islands, Antarctica) is one of the most active volcanoes in Antarctica, having recently erupted in 1967,1969 and 1970. It is also seismically very active, as 1992 seismic crisis was noted. The island has attracted the attention of many geoscientists to study seismo-volcanic events and how they are related with the regional and local tectonic regimes. If so, fractures and faults are involved in most of the geologic and geomorphologic dynamical processes over the island. There is no any unified quality fracture map to study such a surface and subsurface media. Therefore, this work presents a fault traces map interpreted from satellite and aerial photographs, digital elevation model, and bibliographic data. The distribution of trace lengths and orientation takes in account the whole field geological and geophysical observations. The final map has been used to define a tectonic zoning in the Deception Island based on trace scaling properties. Fractal characteristic, as a probabilistic fractal dimension D, has been computed by means of a Levy-Lee flight model. Three different behaviours (D<1.5, D»1.5 and D>1.5), which mean six different areas over the island, have been detected and associated with the fracture pattern and volcanic processes