La falla del norte de la Maladeta, ¿fuente sísmica del terremoto de Vielha (11 de Noviembre de 1923)?

María Ortuño Candela ^[1] ; Hector Perea ^[1] ; Eulalia Masana ^[1] ; Pere Santanach ^[1]
1. [1] Universitat de Barcelona
  
  Universitat de Barcelona
  
  Barcelona, España
Localización: Geotemas (Madrid), ISSN 1576-5172, Nº. 6, 3, 2004 (Ejemplar dedicado a: IV Congreso Geológico de España (Zaragoza, 12-15 julio, 2004)), págs. 171-174
Idioma: español
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Resumen
- Instrumental and macroseismlc data were computed using the Casperini et al. (1999) method in order to define the seimogenic source of the 19 November 1923 earthquake in the Aran Valley (Central Pyrenees). The resulting data consist of a theoretical rupture area with an azimuth of N88E, an epicentre located at 42Q42'N, 0Q47'E, and an associated magnitude of Mw=5.8. These data are in agreement with previous studies by Susagna et a i (1994) and suggest that the Maladeta North Fault is the structure responsible for the seismic event. Morphological analysis in the area leads to recognise the displacement of planation surfaces along this fault with an easternward increasing offset and to estimate a maximum slip for the fault of 625 m in the Muntanheta area. Taking into account the presumed age of the deposits lying on the downthrown wall of the fault, the slip rate for the fault can be constrained between 0.04 mm/a and 0.07 mm/a for the last 10 Ma.