Esfuerzos actuales en la región del Arco de Scotia.

Galindo-Zaldívar, J. ^[1] ; Jabaloy, A. ^[1] ; Maldonado, A. ^[2] ; Sanz de Galdeano, C. ^[2]
1. [1] Universidad de Granada
  
  Universidad de Granada
  
  Granada, España
2. [2] Instituto Andaluz de Ciencias de la Tierra
  
  Instituto Andaluz de Ciencias de la Tierra
  
  Granada, España
Localización: Geogaceta, ISSN 0213-683X, Nº. 20, 4, 1996 (Ejemplar dedicado a: Comunicaciones presentadas en el IV Congreso Nacional de Geología, Alcalá de Henares, 1996), págs. 817-819
Idioma: español
Títulos paralelos:
- Present-day stresses in the Scotia Arc region
Enlaces
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Resumen
- The study of the stresses in the Scotia Arc, determined by right dihedra diagrams of earthquake focal mechanisms, illustrates the present-day tectonics of the region. The Scotia Arc is a large sinistral fault zone, with NE-SW subhorizontal (δ1, where the relative motion between the Antarctic and South America plates is distributed. While the North Scotia Ridge is deformed by sinistral transpressive faults, related to the general stress field, the transpressive sinistral deformations in the Shackleton Fracture Zone are related to a stress field δ1 of WNW-ESE trend and subhorizontal. In the Bransfield Strait and in the South Scotia Ridge, stresses are extensional, with δ1 subvertical and δ3 trending NW-SE, and produce respectively in each region, normal and transtensive sinistral faults.