Abstract
Hypocenters of main shock and aftershocks of the March 20, 2006 Laalam earthquake are relocated using HypoDD double-difference technique. We combined accelerogram and seismogram data of the National Center of Applied Research in Earthquake Engineering (CGS). Among about 191 aftershocks, recorded at least by 4 stations, 141 aftershocks of Md 1.2–2.7 were relocated using HypoDD. The obtained swarm of epicenters occupying a crustal volume of 5 km × 3 km × 5 km and the focal mechanism corresponds to an unknown pure left lateral strike slip, trending N174°E. We were able to calculate focal mechanisms for only seven aftershocks with more than seven polarity readings, which give a P axis oriented NNW–SSE. The waveform inversion also provided values of Mw 5.1, M0 5.9 10−16 Nm and the depth 4.9 km. The dislocation and the stress drop were estimated to 90 cm and 16.5 bars, respectively.
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Abbes, K., Dorbath, L., Dorbath, C., Djeddi, M., Ousadou, F., Maouche, S., et al. (2015). The Beni Haoua, Algeria, Mw 4.9 earthquake: Source parameters, engineering, and seismotectonic implications. Journal of Seismology, 20(2), 655–667.
Abbouda, M., Bouhadad, Y., Benfedda, A., & Slimani, A. (2018). Seismotectonic and seismological aspects of the Mostaganem (Western Algeria) May 22, 2014 (Mw 4.9) seismic event. Arabian Journal of Geoscience., 11, 57. https://doi.org/10.1007/s12517-018-3404-y.
Aoudia, A., Vaccari, F., Suhadolc, P., & Meghraoui, M. (2000). Seismogenic potential and earthquake hazard assessment in the Tell Atlas of Algeria. J. of Seismology, 4, 79–98.
Argus, D. F., Gordon, R. G., De Mets, C., & Stein, S. (1989). Closure of the Africa–Eurasia–North America plate motion circuit and tectonics of the Glauria fault. Journal of Geophysical Research, 94, 5585–5602.
Ayadi, A., & Bezzeghoud, M. (2014). Seismicity of Algeria from 1365 to 2013: Maximum observed intensity map (MOI2014). Seismological Research Letters, 86(1), 236–244.
Belabbes, S. (2008). Caractérisation de la déformation active par l’interférométrie radar (InSAR): Failles sismiques aveugles et cachées de l’Atlas Tellien (Algérie) et du Rif (Maroc) le long de la limite des plaques Afrique-Eurasie. Ph.D. thesis, Strasbourg: EOST, p 200.
Belabbes, S., Meghraoui, M., Cakir, Z., & Bohadad, Y. (2009). InSAR analysis of the moderate size Ain Témouchent (Algeria) blind thrust earthquake (22/12/1999, Mw = 5.7. Journal of Seismology, 1, 1. https://doi.org/10.1007/10950-008-9135-x.
Beldjoudi, H., Delouis, B., Djellit, H., Yelles-Chaouche, A., Gharbi, S., & Abacha, I. (2016). The Beni-Ilmane (Algeria) seismic sequence of May 2010: Seismic sources and stress tensor calculations. Tectonophysics. https://doi.org/10.1016/j.tecto.2015.12.021.
Beldjoudi, H., Guemache, M. A., Kherroubi, A., Semmane, F., Yelles-Chaouche, A. K., Djellit, H., et al. (2009). The Lâalam (Béjaia, North-East Algeria) moderate earthquake (Mw 5.2) on March 20th, 2006. Pure and Applied Geophysics, 166, 623–640. https://doi.org/10.1007/s00024-009-0462-9.
Benfedda, A., Abbes, K., Bouziane, D., Bouhadad, Y., Slimani, A., Larbes, S., et al. (2017). The August 1st, 2014 (Mw 5.3) moderate earthquake: Evidence for an active thrust fault in the Bay of Algiers (Algeria). Pure and Applied Geophysics. https://doi.org/10.1007/s00024-017-1481-6.
Benhammouche, A., Nedjari, A., Bouhadad, Y., Machane, D., Oubaiche, E. H., & Sidi Said, N. (2013). Field evidence of seismites in quaternary deposits of the Jijel (Eastern Algeria) Coastal Region. Journal of Seismology. https://doi.org/10.1007/s10950-013-9384-1.
Benouar, D. (1994). Material for the investigation of the seismicity of Algeria and adjacent regions during the twentieth century. In Annali di geofisica, XXXVII, No. 4.
Bezzeghoud, M., & Buforn, E. (1999). Source parameters of the 1992 Mellila (Spain, Mw4.8); 1994 Al Hoceima (Morocco, Mw5.8) and the Mascara (Algeria, Mw 5.7) earthquakes and seismotectonic implications. Bulletin of the Seismological Society of America, 99, 359–372.
Bouhadad, Y. (2001). The Murdjadjo, western Algeria, fault-related fold: implication for seismic hazard. Journal of Seismology, 5, 541–558.
Bouhadad, Y. (2013). Occurrence and impact of characteristic earthquakes in Algeria. Natural Hazards Journal. https://doi.org/10.1007/s11069-013-0704-0.
Bouhadad, Y., Benhammouche, A., Bourenane, H., Ait Ouali, A., Chikh, M., & Guessoum, N. (2010). The Laalam (Algeria) damaging landslide triggered by a moderate earthquake (Mw = 5.2). Journal Natural Hazards, 54, 261–272.
Bouhadad, Y., Nour, A., Laouami, N., & Belhai, D. (2003). The Béni-Ouartilane-Tachaouaft fault: seismotectonic of the Babors region. Journal of Seismology, 7(1), 79–87.
Bounif, A., Haesler, H., & Meghraoui, M. (1987). The Constantine (Northeast Algeria) earthquake of October 27, 1987: surface ruptures and aftershocks study. Earth and Planetary Science Letters, 85, 451–460.
De Mets, C., Gordon, R. C., Argus, D. F., & Stein, S. (1990). Current plate Motion. Geophysical Journal International, 101, 425–478.
Deschamps, A., Bezzeghoud, M., & Bounif, A. (1991). Seismological study of the Constantine (Algeria) earthquake (27 October 1985). In J. Mezcua & A. Udias (Eds.), Seismicity, Seismotectonics and Seismic Risk of the Ibero-Maghrebian Region (Vol. 8, pp. 163–173). Madrid: Publ. Inst. Geogr. Nac.
Fréchet, J., & Thouvenot, F. (2004). Pickev 2000: Software for seismogram picking and processing, earthquake location, and mapping. http://www.orfeus-eu.org/website_until_17aug2016/software/pc_sharewarelinks.html.
Guessoum, N., Benhamouche, A., Bouhadad, Y., Bourenane, H., & Abbouda, M. (2018). Field evidence of Quaternary seismites in the Mostaganem-Relizane (western Algeria) region: Seismotectonic implication. Arabian Journal of Geosciences, 11(20), 641. https://doi.org/10.1007/s12517-018-4009-1. (1–13).
Harbi, A., Maouche, S., & Ayadi, A. (1999). Neotectonics and associated seismicity in the Eastern Tellean Atlas of Algeria. Journal of Seismology, 3, 95–104.
Kherroubi, A., Deverchère, D., Yelles, A., Mercier de Lepinay, B., Domzig, A., Cattaneo, A., et al. (2009). Recent and active deformation pattern off the eastern most Algerian margin, western Mediterranean sea: New evidence of contractional tectonic reactivation. Marine Geology, 261, 17–32.
Klein, F. (1978). User’s guide to HYPOINVERSE-2000, USGS Open- file Report 02-171, vers.1, p 123, (USGS, 2002).a Fortran program to solve for earthquake locations and magnitudes.
Meghraoui, M. (1988). Géologie des zones sismiques du Nord de l’Algérie. Paléosismologie, tectonique active et synthèse sismotectonique. Thèse doct. Univ. Paris VI, p. 356.
Meghraoui, M., Maouche, S., Chemaa, B., Cakir, Z., Aoudia, A., Harbi, A., et al. (2004). Coastal uplift and thrust faulting associated with the (Mw6.8) ZEMMOURI (Algeria) earthquake of 21 May, 2003. Geophysical Research Letters, 31, L19605.
Mokrane, A., Ait Messaoud, A., Sebai, A., Menia, N., Ayadi, A.; Bezzeghoud, M., & Benhallou, H. (1994). Les séismes en Algérie de 1365 à 1992, publication du CRAAG, Alger.
Nocquet, J. M., & Calais, E. (2004). Geodetic measurements of crustal deformation in the western Mediterranean and Europe. Pure and Applied Geopys., 161, 661–681.
Paul, W., & Smith, W. H. F. (1998) New, improved version of generic mapping tools released. Eos, Transactions American Geophysical Union, 79(47), 579.
Rothé, J. P. (1950). Les séismes de Kerrata et la séismicité de l’Algérie. Bull. Ser. de la carte géologique de l’Algérie 1950, 16–17.
Vila, J. M. (1980). La chaîne alpine d’Algérie orientale et des confins algéro-tunisiens. Thèse ès Sci. Paris VI, 2 t.
Waldhauser, F., & Ellsworth, W. L. (2000). A double-difference earthquake location algorithm: Method and application to the Hayward fault. Bulletin of the Seismological Society of America, 90, 1353–1368.
Yagi, Y., & Nishimura, N. (2011). Moment tensor inversion of near source seismograms. Bulletin of the International Institute of Seismology and Earthquake Engineering, 45, 133–138.
Acknowledgements
We would like to thank the editor and the anonymous reviewer for their thoughtful and constructive comments which helped to improve the manuscript. The authors are very grateful to Prof. Y. Yagi who provided us the moment tensor package. The figures were generated by Generic Mapping Tool (GMT) code developed by Paul and Smith (1998).
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Abbes, K., Dorbath, C., Dorbath, L. et al. Revisiting the Laalam (Eastern Algeria) March 20, 2006 (Mw 5.1) Earthquake and its Seismotectonic Implication. Pure Appl. Geophys. 176, 4213–4222 (2019). https://doi.org/10.1007/s00024-019-02206-3
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DOI: https://doi.org/10.1007/s00024-019-02206-3