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Journal of Seismology

, Volume 19, Issue 1, pp 253–264 | Cite as

P and S waves tomographic analysis of the area of El Asnam’s 1980 ms 7.3 earthquake (Algeria) from its aftershock sequence

  • F. Bellalem
  • M. A. Bounif
  • I. Koulakov
Original Article

Abstract

We present the 3D seismic model of crustal structure and the distribution of seismicity in the El Asnam region (Algeria) where a strong earthquake (M7.3) occurred in 1980. We apply the local earthquake tomography inversion for the data of temporary networks which recorded the aftershocks of the 1980 event. The results of the tomography inversion have been rigorously tested using a number of different tests. The velocity anomalies from the inversion show pronounced low-velocity anomalies in the surface rupture zone associated with El Asnam fault, which are consistent with the finding of the previous studies (Philip and Meghraoui Tectonics 2:17–49, 1983), Ouyed et al. (Nature 292:26–31, 1981). Moreover, we have also reported the high velocities that exist at shallow crustal depths in the El Asnam zone. We have associated this feature to tectonic, geomorphological, and structural settings in the study area. Finally, we hope that the main features of the interpretation summarized in this article will be the basis for further integrated geophysical and tectonic analyses.

Keywords

El Asnam 1980 earthquake Cheliff basin Seismic tomography Seismic velocity structure 

Notes

Acknowledgments

We are grateful to the anonymous reviewers and to the associate editor who made constructive and friendly comments which helped us to improve considerably the content of the paper. We thank Mustapha Meghraoui from University of Strasbourg for his advises and comments on an earlier version of this manuscript. Ivan Koulakov is supported by the RSCF grant No. 14-17-00430.

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Copyright information

© Springer Science+Business Media Dordrecht 2014

Authors and Affiliations

  1. 1.Centre de Recherche en Astronomie, Astrophysique et Géophysique, CRAAGAlgiersAlgeria
  2. 2.Faculty of earth sciencesFSTGAT, USTHBAlgiersAlgeria
  3. 3.Trofimuk Institute of Petroleum Geology and GeophysicsNovosibirskRussia
  4. 4.Novosibirsk State UniversityNovosibirskRussia

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