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

ISSN: 1886-7995,  1698-6180

Datum der Publikation: 2022

Ausgabe: 48

Nummer: 2

Seiten: 205-224

Art: Artikel

DOI: 10.1007/S41513-022-00190-7 DIALNET GOOGLE SCHOLAR lock_openOpen Access editor

Andere Publikationen in: Journal of iberian geology: an international publication of earth sciences

Zusammenfassung

The Chelif Basin (North Algeria) is one of the most seismically active zones of the western Mediterranean Sea. It constitutes a key area to study neotectonic structures and their geodynamical context. However, its eastern part of this basin, called Upper Chelif Basin, is an unknown region from geophysical, structural and neotectonic evidences. The aim of this work is to perform a new gravity survey to determine the structural architecture and lithological information of the Upper Chelif Basin. This goal can be achieved by applying to the gravity data diferent processing methods such as gradients, upward continuation, Euler deconvolution, wavelet and ridgelet transforms and modeling. These processing methods are used to examine the relationship between identifed gravity anomalies and the causative structures, included tectonic features. The Bouguer anomaly map processed with diferent methods, shows for the frst time a 2-D and 3-D images of the studied area. The strong gravimetric anomalies noticed, attests the presence of dense geological bodies, maybe deeply rooted. The identifed structures and gravimetric lineaments are well correlated with local and regional geological structures. Among these structures, the Oued El Fodda reverse fault stands out, related to the 1980 earthquake with magnitude Ms=7.2 identifed by an NE-SW lineament. In addition, many new structures and contacts both at surface and depth are sketched out, such as those limiting the basin. The identifed structures at depth show that the thickness is not constant along the whole basin.

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