pure and applied geophysics

, Volume 132, Issue 1–2, pp 311–329 | Cite as

Seismicity and codaQ values in the eastern Pyrenees: First results from the La Cerdanya seismic network

  • Antoni M. Correig
  • Brian J. Mitchell
  • Ramon Ortiz


Seismicity in the La Cerdanya region of the eastern Pyrenees has been accurately mapped for the first time using data from a local seismic network. The majority of earthquakes lies on or near the La Cerdanya fault or secondary faults to the south. Coda magnitudes determined for these earthquakes, using magnitude relations from other regions, range between −0.5 and 2.2. These are, however, presumed to be underdetermined values sinceQ values appear to be very low in the La Cerdanya region. CodaQ values at a frequency of 1.5 Hz range between 17 and 120, the lowest values being obtained for the most seismically active regions. CodaQ values also increase with increasing distance, a result which indicates decreasing seismic attenuation with increasing depth in the crust.

Key words

Seismicity codaQ Q variations 


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Copyright information

© Birkhäuser Verlag 1990

Authors and Affiliations

  • Antoni M. Correig
    • 1
    • 3
  • Brian J. Mitchell
    • 2
  • Ramon Ortiz
    • 1
    • 4
  1. 1.Laboratori d'Estudis Geofisics “Eduard Fontseré,” Institut d'Estudis CatalansFacultat de FisicaBarcelonaSpain
  2. 2.Department of Earth and Atmospheric SciencesSaint Louis UniversitySaint LouisUSA
  3. 3.Department de Geologia Dinamica, Geofisica i Paleontologia, Facultat de FisicaUniversitat de BarcelonaBarcelonaSpain
  4. 4.Museo Nacional de Ciencias NaturalesCSIC, Departamento de GeologiaMadridSpain

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