Journal of Seismology

, Volume 15, Issue 2, pp 173–189 | Cite as

Attempt to identify seismic sources in the eastern Mitidja basin using gravity data and aftershock sequence of the Boumerdes (May 21, 2003; Algeria) earthquake

  • Merzouk Ouyed
  • Mouloud Idres
  • Amar Bourmatte
  • Mohamed Salah Boughacha
  • Sadek Samai
  • Abdelkrim Yelles
  • Abderrahmene Haned
  • Chafik Aidi
Article

Abstract

In order to try to identify the seismogenic sources in the epicentral area, we interpreted data collected from gravity and aftershocks in the eastern part of the Mitidja basin after the occurrence of the 21 May 2003 Boumerdes earthquake (Mw = 6.8). The residual gravity anomaly and the horizontal gradient maps revealed the basement shape and density discontinuities. A seismotectonic model obtained from the aftershocks distribution and gravity data is proposed. This model highlights three active faults: one offshore and two onshore. The offshore reverse fault striking NE-SW, parallel to the coast, is consistent with the USGS focal mechanism of the main event, which is assumed to have the most moment release. The two onshore dipping blind active faults are postulated at crossing angles near the SW tip of the main fault. The interpretation is based mainly on the re-location and distribution of aftershocks, and their focal solutions. It is also supported by the basin structures obtained from the inversion and interpretation of residual gravity anomalies, as well as by additional compiled information such as the pattern of coastal co-seismic uplift. This configuration puts forward the failure mode complexity during the main shock. The topography of the basement obtained from 3D gravity inversion shows that all the onshore located aftershocks occurred in the basement, and the area between the two onshore faults rose as a consequence of their sliding.

Keywords

Aftershock sequence Algeria Basement Boumerdes earthquake Gravity 

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References

  1. Ayadi A, Maouche S, Harbi A, Meghraoui M (2003) Strong Algerian earthquake strikes near capital city. Eos Trans AGU 84:561–568CrossRefGoogle Scholar
  2. Ayadi A, Dorbath C, Ousadou F, Maouche S, Chikh M, Bounif MA, Meghraoui M (2008) Zemmouri earthquake rupture zone (Mw 6.8, Algeria): Aftershocks sequence relocation and 3D velocity model. J Geophys Res 113:B09301. doi:10.1029/2007JB005257 CrossRefGoogle Scholar
  3. Bezzeghoud M, Ayadi A, Sebaï A, Benhallou H (1994) Seismogenic zones survey by Algerian Telemetred Seismological Network, Case study of Rouina earthquake of January 19th, 1992. Phys Earth Planet Inter 84:235–246CrossRefGoogle Scholar
  4. Boudiaf A (1996) Etude sismotectonique de la région d’Alger et de la Kabylie (Algérie): Utilisation des Modèles Numériques de Terrain (MNT) et de télédétection pour la reconnaissance des structures tectoniques actives. PhD thesis, University of MontpellierGoogle Scholar
  5. Boudiaf A, Ritz JF, Philip H (1998) Drainage diversions as evidence of propagating active faults: example of the El Asnam and Thenia faults, Algeria. Terra Nova 10:236–244CrossRefGoogle Scholar
  6. Boughacha MS, Ouyed M, Benhallou H, Djeddi M, Hatzfeld D (2003) Sismicité en Algérie de 1790 à 2000. Mécanismes aux foyers et vitesse de rapprochement inter-plaques. Bull Serv Géol de l’Algérie 14:65–77Google Scholar
  7. Boughacha MS, Ouyed M, Ayadi A, Benhallou H (2004) Seismicity and seismic hazard mapping of Northern Algeria: map of maximum calculated intensities (MCI). J Seismol 8:1–10CrossRefGoogle Scholar
  8. Bounif A, Bezzeghoud M, Dorbath L, Legrand D, Deschamps A, Rivera L, Benhallou H (2003) Seismic source study of the 1989, October 29, Chenoua (Algeria) earthquake from aftershocks, broad-band and strong ground motion records. Ann Geophys 46:625–646Google Scholar
  9. Bounif A, Dorbath C, Ayadi A, Meghraoui M, Beldjoudi H, Laouami N, Frogneux M, Slimani A, Alasset PJ, Kharroubi A, Ousadou F, Chikh M, Harbi A, Larbes S, Maouche S (2004) The 21 May 2003 Zemmouri (Algeria) earthquake Mw = 6.8: relocation and aftershocks sequence analysis. Geophys Res Lett 31:L19606. doi:10.1029/2004GL020586 CrossRefGoogle Scholar
  10. Braunmiller J, Bernardi F (2005) The 2003 Boumerdes, Algeria earthquake: regional moment tensor analysis. Geophys Res Lett 32:L06305. doi:10.1029/2004GL022038 CrossRefGoogle Scholar
  11. Das S, Henry C (2003) Spatial relation between main earthquake slip and its aftershock distribution. Rev Geophys 41:1013. doi:10.1029/2002RG000119 CrossRefGoogle Scholar
  12. Delouis B, Vallée M, Meghraoui M, Calais E, Maouche S, Lammali K, Mahsas A, Briole P, Benhamouda F, Yelles K (2004) Slip distribution of the 2003 Boumerdes-Zemmouri earthquake, Algeria, from teleseismic, GPS, and coastal uplift data. Geophys Res Lett 31:L18607. doi:10.1029/2004GL020687 CrossRefGoogle Scholar
  13. De Mets C, Gordon RG, Argus DF, Stein S (1990) Current plate motions. Geophys J Int 101:425–478CrossRefGoogle Scholar
  14. Déverchère J, Yelles K, Domzig A, Mercier de Lépinay B, Bouillin JP, Gaullier V, Bracène R, Calais E, Savoye B, Kherroubi A, Le Roy P, Pauc H, Dan G (2005) Active thrust faulting offshore Boumerdes, Algeria, and its relations to the 2003 Mw 6.9 earthquake. Geophys Res Lett 32:L04311. doi:10.1029/2004GL021646 CrossRefGoogle Scholar
  15. Glangeaud L (1952) Histoire géologique de la province d’Alger. XIXe International Geological Congress, AlgiersGoogle Scholar
  16. Gomez-Ortiz D, Agarwal BNP (2005) 3DINVER.M: a MATLAB program to invert the gravity anomaly over a 3D horizontal density interface by Parker–Oldenburg’s algorithm. Comput Geosci 31:513–520CrossRefGoogle Scholar
  17. Hernandez J, Lepvrier C (1979) Le volcanisme calco-alcalin miocène de la région d’Alger (Algérie): pétrologie et signification géodynamique. Bull Soc Géol France 7:73–86Google Scholar
  18. Idres M, Bourmatte A, Aïfa T (1993) Nouveau réseau de bases de référence pour le Nord de l’Algérie. Bull Inf BGI 73:25–34Google Scholar
  19. Klein FW (2002) Hypoinverse-2000, a Fortran program to solve for earthquake locations and magnitudes, 4/2002 version. Open File Report 02-171 (US Geological Survey, Boulder, CO, USA)Google Scholar
  20. Meghraoui M (1982) Etude néotectonique de la région nord-est d’El-Asnam : relation avec le séisme du 10 Octobre 1980. PhD thesis, University of ParisGoogle Scholar
  21. Meghraoui M (1988) Géologie des zones sismiques du nord de l’Algérie: tectonique active, paléoséismologie et synthèse sismotectonique. PhD thesis, University of Paris-OrsayGoogle Scholar
  22. Meghraoui M, Maouche S, Chemaa B, Cakir Z, Aoudia A, Harbi A, Alasset PJ, Ayadi A, Bouhadad Y, Benhamouda F (2004) Coastal uplift and thrust faulting associated with the Mw = 6.8 Zemmouri (Algeria) earthquake of 21 May, 2003. Geophys Res Lett 31:L19605. doi:10.1029/2004GL020466 CrossRefGoogle Scholar
  23. Ouyed M, Yielding G, Hatzfeld D, King GCP (1983) An aftershock study of the El Asnam (Algeria) earthquake of 1980 October 10. Geophys J R Astr Soc 73:605–639Google Scholar
  24. Semmane F, Campillo M, Cotton F (2005) Fault location and source process of the Boumerdes, Algeria, earthquake inferred from geodetic and strong motion data. Geophys Res Lett 32:L01305. doi:10.1029/2004GL021268 CrossRefGoogle Scholar
  25. Stevenson DA, Talwani P (2004) 2001–2002 upper three runs sequence of earthquakes at the Savannah river site, South Carolina. Seismo Res Lett 75:107–116. doi:10.1785/gssrl.75.1.107 CrossRefGoogle Scholar
  26. Yamamoto A (2005) Gravity-based fault mapping: the Ishikari lowland, Hokkaido, Japan. International Association of Geodesy Symposia, vol 128. Symposium G03:242–247. doi:10.1007/3-540-27432-4_41 Google Scholar
  27. Zhang J, Gao R, Zeng L, Li Q, Guan Y, He R, Wang H, Lu Z (2010) Relationship between characteristics of gravity and magnetic anomalies and the earthquakes in the Longmenshan range and adjacent areas. Tectonophysics 491:218–229CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media B.V. 2010

Authors and Affiliations

  • Merzouk Ouyed
    • 1
  • Mouloud Idres
    • 1
  • Amar Bourmatte
    • 1
  • Mohamed Salah Boughacha
    • 1
  • Sadek Samai
    • 1
  • Abdelkrim Yelles
    • 2
  • Abderrahmene Haned
    • 2
  • Chafik Aidi
    • 2
  1. 1.Faculty of Earth Sciences, Geophysics LaboratoryUniversité des Sciences et de la Technologie Houari Boumediene (USTHB)AlgiersAlgeria
  2. 2.Centre de Recherche en Astronomie, Astrophysique et GéophysiqueAlgiersAlgeria

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