Anisotropy beneath the North Pyrenean fault

Details Anisotropy beneath the North Pyrenean fault Anisotropy beneath the North Pyrenean fault

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993pepi...78..239s&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 78, Issue 3-4, p. 239-244.

Physics

5

Scientific paper

The anisotropy beneath the North Pyrenean fault, which delineates the boundary between the Eurasian and Iberian plates, is studied from the splitting of SKS- and SKKS-waves recorded at a broad-band station of the NARS array in the western Pyrenees. Events coming from different azimuths and with different incidences reveal a complex pattern of anisotropy. It is globally characterized by a fast direction at 105° east from north, parallel to the elongation of the range. Events coming from the south give a time delay between the fast and slow directions consistent with that obtained in Iberian stations (δt = 1.0-1.5 s). Most of the events coming from the north give a very large, 2 s, time delay. It is suggested that this strong anisotropy results from the combined effects of two contributions: one related to the large scale anisotropy in southern Europe and one related to the specific tectonics of the Pyrenean range.

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