The Al Hoceima Mw 6.4 earthquake of 24 February 2004 and its aftershocks sequence

Woerd, J. van der; Dorbath, Catherine; Ousadou, Farida; Dorbath, L.; Delouis, Bertrand; Jacques, Éric; Tapponnier, Paul; Hahou, Youssef; Menzhi, Mohammed; Frogneux, M.; Haessler, H.

doi:10.1016/j.jog.2013.12.004

Cited by 36 publications

(52 citation statements)

References 53 publications

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“…The 1993–1994 seismic sequence affected the coastal region nearby Al Hoceima, with a main earthquake of M w = 5.6 (26 May 1994), after an earlier earthquake in the Campo de Dalías area, of M w = 5.3 (23 December 1993). In 2004, another seismic sequence with a devastating earthquake event of M w = 6.4 (24 February) occurred onshore in the Al Hoceima region causing nearly 600 deaths and with aftershocks reaching the Alboran Sea (Van der Woerd et al, ). Earthquake focal mechanisms were very similar in all cases, pointing mainly to sinistral strike slip along the NNE‐SSW oriented deformation zone (El Alami et al, ; Stich et al, , ), although also possible is the activity of WNW‐ESE dextral faults in the 2004 sequence that affect Al Hoceima onshore areas (Akoglu et al, ; Van der Woerd et al, ).…”

Section: Resultsmentioning

confidence: 99%

“…The seismicity database of the Spanish National Geographic Institute (IGN) (http://www.ign.es) registered the 2016–2017 seismic sequence and the two previous main seismic series, in 1993–1994 and 2004. The 2004 seismic sequence was carefully relocated by Van der Woerd et al (). As the precise location of seismicity is sensitive to velocity models and to the distance of the seismic stations (Michelini & Lomax, ), literature (Buforn et al, ; Kariche et al, ; Medina & Cherkaoui, ) shows a noncoincident location for the 2016–2017 seismic sequence' epicenters.…”

Section: Methodology and Datamentioning

confidence: 99%

“…Seismicity distribution during the 2016–2017 seismic sequence and other recent seismicity (including 1993–1994 and 2004 series; (2004 seismic sequence from Van der Woerd et al, ; other seismicity from www.ign.es database). (a) Epicenters considering a standard velocity model.…”

Section: Introductionmentioning

confidence: 99%

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Imaging the Growth of Recent Faults: The Case of 2016–2017 Seismic Sequence Sea Bottom Deformation in the Alboran Sea (Western Mediterranean)

et al. 2018

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The Eurasian-African NW-SE oblique plate convergence produces shortening and orthogonal extension in the Alboran Sea Basin (westernmost Mediterranean), located between the Betic and Rif Cordilleras. A NNE-SSW broadband of deformation and seismicity affects the Alboran central part. After the 1993-1994 and 2004 seismic series, an earthquake sequence struck mainly its southern sector in 2016-2017 (main event M w = 6.3, 25 January 2016). The near-surface deformation is investigated using seismic profiles, multibeam bathymetry, gravity and seismicity data. Epicenters can be grouped into two main alignments. The northern WSW-ENE alignment has reverse earthquake focal mechanisms, and in its epicentral region recent mass transport deposits occur. The southern alignment consists of a NNE-SSW vertical sinistral deformation zone, with early epicenters of higher-magnitude earthquakes located along a narrow band 5 to 10-km offset westward of the Al Idrisi Fault. Here near-surface deformation includes active NW-SE vertical and normal faults, unmapped until now. Later, epicenters spread eastward, reaching the Al Idrisi Fault, characterized by discontinuous active NNE-SSW vertical fractures. Seismicity and tectonic structures suggest a westward propagation of deformation and the growth at depth of incipient faults, comprising a NNE-SSW sinistral fault zone in depth that is connected upward with NW-SE vertical and normal faults. This recent fault zone is segmented and responsible for the seismicity in 1993-1994 in the coastal area, in 2004 onshore, and in 2016-2017 offshore. Insights for seismic hazard assessment point to the growth of recent faults that could produce potentially higher magnitude earthquakes than the already formed faults.

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Section: Resultsmentioning

confidence: 99%

Section: Methodology and Datamentioning

confidence: 99%

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Imaging the Growth of Recent Faults: The Case of 2016–2017 Seismic Sequence Sea Bottom Deformation in the Alboran Sea (Western Mediterranean)

et al. 2018

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“…Cette direction est en accord avec la direction de la faille de Boussekour Aghbar (figure 9) responsable de l'événement sismique de 1994, ainsi que les fracturations de surface causées par le séisme du 2004 (figure 11). L'analyse des mécanismes au foyer des séismes majeurs (figure 10), a permis de mettre en évidence deux directions de failles en profondeur, NE-SW et NW-SE [24]. On note que les données issues de la méthode de sismique réflexion haute résolution ont permis de mettre en évidence l'existence des failles dans le large de la mer d'Al Hoceima de directions NE-SW [26].…”

Section: Résultats Et Discussionunclassified

“…Leurs mécanismes au foyer indiquent un jeu décrochant senetre pour les NE-SW et dextre pour les NW-SE [23]. Cette solution des deux failles a été reprise et retenue par [24] avec distance entre les deux failles estimée à 1,5 km. La direction déduite par les données InSAR (interférogrammes) réalisées par [21], proposent un plan de faille de direction N23E avec un pendage de 77° vers le SE.…”

Section: Ruptures De Surface Développées Lors Des Séismes De 1994 Et unclassified

Analysis of the recent Plio-Quaternary deformation and the correlation with the focal mechanisms of the significant earthquakes in the Bokoya, Ras Tarf (Eastern Rif)

Mahsani

Brahim

2018

MATEC Web Conf.

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Abstract. Relative movements of microplates developed between the African and Eurasian plate characterize the continuity of the tectonic movements in Westerner of the Mediterranean Sea. The convergence movements between these plates, at the origin of the current structuring in oriental Rif. The recent tectonics in the south ripple of Alboran Sea, translated by an important seismic activity, In the North of Morocco, exactly in the Al Hoceima region, considered as zone of plates border with important seismicity. The structural analysis made in this paper and the interpretation of focals mechanisms earthquakes characteristics in the Al Hoceima region, has allows to deduct the main directions of faults, which we compared with the results of the satellite images. This study we has provides to demonstrate the directions of faults which are able to generate earthquakes in the future. The direction NE-SW represents the overall faults dominant in oriental Rif, this major direction coincides with the breaks of surface. A reduced number of faults shows a generall direction NNE-SSO to N-S through the Quaternary formations in the NO of Al Hoceima city, the direction NO does not show a good correlation with the directions of surface rupture, as well as with the deducted directions from focals mechanisms. This study drives us to propose that faults of direction NNE-SSO to NE-SO, represent the major directions of the faults in the Al Hoceima region, which represents the main cause of the seismic activity in the region.

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The Use of an ELMI for Measuring the Movement of the Trougout and the Ajdir-Imzouren Faults—(North East of the RIF) MOROCCO—Between 2017 and 2019

Taher

Mourabit

2022

Advances in Geophysics, Tectonics and Petroleum Geosciences

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The Al Hoceima Mw 6.4 earthquake of 24 February 2004 and its aftershocks sequence

Cited by 36 publications

References 53 publications

Imaging the Growth of Recent Faults: The Case of 2016–2017 Seismic Sequence Sea Bottom Deformation in the Alboran Sea (Western Mediterranean)

Imaging the Growth of Recent Faults: The Case of 2016–2017 Seismic Sequence Sea Bottom Deformation in the Alboran Sea (Western Mediterranean)

Analysis of the recent Plio-Quaternary deformation and the correlation with the focal mechanisms of the significant earthquakes in the Bokoya, Ras Tarf (Eastern Rif)

The Use of an ELMI for Measuring the Movement of the Trougout and the Ajdir-Imzouren Faults—(North East of the RIF) MOROCCO—Between 2017 and 2019

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