Interpretation of new gravity survey in the seismogenic Upper Chelif Basin, North of Algeriadeep structure and modeling

  1. Mohamed Bendali 1
  2. Abdeslam Abtout
  3. Boualem Bouyahiaoui
  4. Hassina Boukerbout
  5. Abbas Marok 2
  6. Matías Reolid 3
  1. 1 Centre Universitaire Khemis Miliana
    info

    Centre Universitaire Khemis Miliana

    Khemis Miliana, Argelia

    ROR https://ror.org/05n2gzs35

  2. 2 University of Tlemcen
  3. 3 Universidad de Jaén
    info

    Universidad de Jaén

    Jaén, España

    ROR https://ror.org/0122p5f64

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Revista:
Journal of iberian geology: an international publication of earth sciences

ISSN: 1886-7995,  1698-6180

Año de publicación: 2022

Volumen: 48

Número: 2

Páginas: 205-224

Tipo: Artículo

DOI: 10.1007/S41513-022-00190-7 DIALNET GOOGLE SCHOLAR lock_openAcceso abierto editor

Otras publicaciones en: Journal of iberian geology: an international publication of earth sciences

Resumen

La Cuenca de Chelif (Norte de Argelia) es una de las zonas sísmicamente más activas del Mediterráneo occidental. Constituye un área clave para el estudio de las estructuras neotectónicas y su contexto geodinámico. Sin embargo, el sector oriental de esta Cuenca, denominado Cuenca Superior de Chelif, es una región desconocida desde el punto de vista geofísico, estructural y de evidencias neotectónicas. El objetivo de este trabajo es realizar un estudio gravimétrico que permita determinar la arquitectura estructural de la Cuenca Superior de Chelif. Este objetivo se ha abordado con el empleo de diferentes métodos de procesado de nuevos datos gravimétricos, como puede ser el método de gradientes, el de continuación, deconvolución de Euler, y la transformada de Ridgelet. Estos métodos de procesamiento son empleados para examinar las relaciones entre las anomalías de la gravedad identifcadas y las estructuras que las originan, incluidas aquellas de carácter tectónico. El mapa de anomalías de Bouguer procesado con distintos métodos muestra por primera vez imágenes bidimensionales y tridimensionales del área de estudio. Las principales anomalías gravimétricas identifcadas muestran la presencia de cuerpos geológicos densos, profundamente enraizados. Los alineamientos gravimétricos identifcados se correlacionan bien con estructuras geológicas locales y regionales. Entre estas estructuras destaca la falla inversa de Oued El Fodda, relacionada con el terremoto de 1980 de magnitud 7.2 identifcado por un alineamiento NE-SW. Además, nuevas estructuras y contactos en superfcie y en profundidad han sido detectados, así como aquellos que limitan la cuenca. Las estructuras identifcadas en profundidad muestran que el espesor del relleno de la cuenca es variable.

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