Fracturación cortical inferida a partir de técnicas de sismicidad activa y pasivaextensión neógena en el “forebulge” de la Cuenca del Guadalquivir
- Francisco Manuel Alonso-Chaves 1
- Albert Macau 2
- Sara Figueras 2
- Beatriz Benjumea 2
- Anna Gabàs 2
- Antoni Roca 2
- Encarnación García-Navarro 1
- Ricard Puig 2
- José Sedano 2
- 1 Departamento de Ciencias de la Tierra, Universidad de Huelva
- 2 Institut Cartogràfic i Geològic de Catalunya, Parc de Montjuic,
ISSN: 0213-683X
Year of publication: 2020
Issue: 67
Pages: 15-18
Type: Article
More publications in: Geogaceta
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.