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Caracterización de la cuenca neógena de la Cerdanya mediante la combinación de métodos geofísicos: sísmica pasiva, magnetotelúrica y gravimetría.

Other TitlesCharacterization of the Cerdanya Neogene Basin by combining geophysical methods: passive seismic, magnetotelluric and gravimetry.
AuthorsMacau, Albert; Rey Moral, María del Carmen; Rubio Sánchez-Aguililla, Félix Manuel; Gabàs, Anna; Bellmunt, Fabián; Andrés, Juvenal CSIC ORCID; Soto, Ruth CSIC ORCID ; Clariana, Pilar; González Durán, Agustín; García García, Arturo; Benjumea, Beatriz; Ayala, C. CSIC ORCID
KeywordsSísmica pasiva
Cociente espectral H/V
Cuenca Neógena
Exploración geofísica
Issue Date2023
PublisherCentro Nacional de Información Geográfica (España)
Citation10.ª Asamblea Hispano-Portuguesa de Geodesia y Geofísica - Artículos: 1021-1031 (2023)
Abstract[EN] The Cerdanya Neogene basin, located in the eastern sector of the Central Pyrenees, has been studied to characterize its structure in depth. The thickness of the Neogene filling of the basin (detrital materials with some levels of lignite) has been inferred by combining different geophysical exploration methods in a NW-SE trending profile that crosses, perpendicularly, the basin in its central part: passive seismic (H/V spectral ratio method and array technique), electromagnetic methods (MT and AMT) and gravimetry. Applying the array technique, the shear wave velocity (Vs) of the basin materials has been calculated, both for the Neogene deposits and the bedrock. These data combined with the results obtained from the H/V spectral ratio method allow deriving the bedrock geometry. The electromagnetic method provides the 2D electrical resistivity model, characterizing the geoelectric properties of the basin and depicting the presence of the d'Alp-la Tet fault, an important structural element of the basin. The electrical model inversion uses as an initial model the bedrock depth obtained from the passive seismic. In the residual Bouguer anomaly modelling, a satisfactory gravimetric model is obtained when the thickness of the Neogene deposits varies between 0 and 650 meters and assigned density of 2.2 g/cm3 , supported by the low Vs obtained. The thickness of the Neogene filling presents variations that are related to the presence of normal fault with small vertical offset. The application of this methodology, based on the combination of different geophysical exploration methods, has reduced the different uncertainties inherent in each geophysical method, and aim to characterize the Cerdanya Neogene basin geometry.
DescriptionCongreso realizado en Toledo del 28 de noviembre al 1 de diciembre de 2022.
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