Fracturación cortical inferida a partir de técnicas de sismicidad activa y pasivaextensión neógena en el “forebulge” de la Cuenca del Guadalquivir

  1. Francisco Manuel Alonso-Chaves 1
  2. Albert Macau 2
  3. Sara Figueras 2
  4. Beatriz Benjumea 2
  5. Anna Gabàs 2
  6. Antoni Roca 2
  7. Encarnación García-Navarro 1
  8. Ricard Puig 2
  9. José Sedano 2
  1. 1 Departamento de Ciencias de la Tierra, Universidad de Huelva
  2. 2 Institut Cartogràfic i Geològic de Catalunya, Parc de Montjuic,
Journal:
Geogaceta

ISSN: 0213-683X

Year of publication: 2020

Issue: 67

Pages: 15-18

Type: Article

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Abstract

The application of passive and active seismicity techniques has allowed us to observe variations in the fundamental frequency of the soil in a transversal in the estuaries Odiel and Tinto (Huelva). The lowest values (0.27-0.29 Hz) are at the eastern end of the transver-sal, near Mazagón. The highest values (0.83-1.06 Hz) are located at the western end of the transversal, west of Odiel. The “rocky base-ment” (mechanical) is identified as the roof of the transgressive ba-sal complex (limestones of Neogene age). The Paleozoic basement will be located 10-20 meters below these limestones. It is interpreted that NNE-SSO extensional faults accommodate the extension of the earth’s crust during the Neogen in relation to the “forebulge” of the Guadalquivir Basin.

Data source: Dialnet