M. Benmakhlouf

Abdelmalek Essaâdi University

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Ahmed Chaloüan

Mohammed V University

Jesús Galindo‐Zaldívar

Instituto Andaluz de Ciencias de la Tierra

M. Ahmamou

Mohammed V University

Patricia Ruano

Instituto Andaluz de Ciencias de la Tierra

Carlos Sanz de Galdeano

ExxonMobil (United States)

Antonio Pedrera

Instituto Geológico y Minero de España

A. C. López-Garrido

Instituto Andaluz de Ciencias de la Tierra

Ana Ruiz‐Constán

Instituto Geológico y Minero de España

Omar Azzouz

Mohamed I University

Farida Anahnah

Universidad de Granada

Cooperative Institutions

Universidad de Granada

Instituto Geológico y Minero de España

Consejo Superior de Investigaciones Científicas

Instituto Andaluz de Ciencias de la Tierra

Abdelmalek Essaâdi University

Mohammed V University

Sidi Mohamed Ben Abdellah University

University of California, Santa Barbara

Instituto Español de Oceanografía

Institut de Ciències del Mar

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Magnetotelluric study in the western transect of the Rif Cordillera

EGUGA (2009)

F. Anahnah Jesús Galindo‐Zaldívar J. Pous Ahmed Chaloüan M. Benmakhlouf

Magnetotellurics

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Recent Tectonic Deformations and Stresses in the Frontal Part of the Rif Cordillera and the Saïss Basin (Fes and Rabat Regions, Morocco)

Birkhäuser Basel eBooks (2004)

Kaoutar Bargach Patricia Ruano A. Chabli Jesús Galindo‐Zaldívar Ahmed Chaloüan

Prerif Ridges are located at the frontal part of the Rif Cordillera, which develops at the Eurasian-African plate boundary. The ridges are formed by recent tectonic structures that also deform foreland basins (Saïss and Gharb basins) and the foreland (Moroccan Meseta). The position of the ridges is the consequence of inversion tectonics undergone in the area. The ENE-WSW trend of the northern edge of the Neogene Saïss basin is determined by the location of Mesozoic basins. Although Prerif ridges probably started to develop since the Early Miocene, the most active deformation phase affecting Pliocene rocks consisted of N-S to NW-SE oriented compression. Striated pebbles show that this compression has prolate stress ellipsoids. The deformation produces southwards vergent folds and NNW-SSE striae on reverse faults at the base of the ridges. The flexure of the Paleozoic basement by the emplacement of the Ridges produced extensional deformation and the development of the Saïss foreland basin. The extension in this basin is oblate and features a well determined NNE-SSW trend near the Ridges, whereas it becomes prolate and pluridirectional near the foreland edge represented by the Rabat region. This part of the Moroccan Meseta, commonly considered to be stable, is deformed by sets of orthogonal joints and faults with short slip that affect up to Quaternary sediments. Southwestward, the Meseta rocks are also deformed by transcurrent faults, which indicate NW-SE and N-S trends of compression. The NW-SE approximation of Eurasia and Africa determines a regional stress field with the same trend of compression. Regional stresses are notably disturbed by the development of the active structures in the Rif, which exhibit alternating trends of compression and extension. The clearest evidence of the relationship between the local deformation and the general plate motion is found at the deformation front of the Cordillera, that is, the Prerif Ridges.

Neogene

Tectonic phase

Transtension

Basement

Transpression

10.1007/978-3-0348-7899-9_4

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Citations (1)

Inversion of transfer faults: The Jebha–Chrafate fault (Rif, Morocco)

Journal of African Earth Sciences (2012)

M. Benmakhlouf Jesús Galindo‐Zaldívar Ahmed Chaloüan Carlos Sanz de Galdeano M. Ahmamou

Echelon formation

Normal fault

Transform fault

10.1016/j.jafrearsci.2012.07.003

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Citations (22)

Very recent seabottom deformation in the area affected by the 2016-2017 seismic crisis in the Alboran sea (Western Mediterranean)

Jesús Galindo‐Zaldívar Gemma Ercilla Ferrán Estrada Manuel Catalán-Morollón Elia d’Acremont

2nd General Assembly for the African Seismological Commission, 23-27 April 2018, Al-Hoceima, Morocco.-- 1 page

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A Geological History for the Alboran Sea Region

Springer eBooks (2021)

J.T. Vázquez Gemma Ercilla Manuel Catalán Damien Do Couto Ferrán Estrada

Extensional tectonics

Neogene

Tethys Ocean

10.1007/978-3-030-65516-7_5

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Modelos gravimétricos y magnéticos en la bahía de Alhucemas y cuenca de Boudinar (Cordillera del Rif)

Geotemas ( Madrid ) (2008)

Farida Anahnah Jesús Galindo‐Zaldívar Ahmed Chaloüan Pablo Cuenca Ruano Omar Azzouz

La region de Alhucemas, situada en la zona oriental de la cordillera del Rif, tiene una actividad sismica reciente importante. Las fallas corticales sismogenicas son de salto en direccion, aunque en superficie son mas abundantes las fallas normales y transtensivas que desarrollan cuencas sedimentarias. El mapa de Anomalia de Bouguer de escala 1: 500000 muestra un aumento de valores hacia el norte, en el paso entre la corteza gruesa del Rif y la delgada de Alboran. Los mapas aeromagneticos regionales de escalas 1: 2500000 y 1: 500000 indican dipolos en las rocas volcanicas de Ras Tarf y las peridotitas de Beni Malek. Las nuevas medidas geofisicas revelan una imagen aproximada de la geometria de las cuencas y la posicion de los cuerpos de rocas igneas basicas. La bahia de Alhucemas es un complejo semigraben, con un depocentro en su borde oriental asociado a la falla transtensiva sinistra de Trougout. Las fallas cubiertas determinan un basamento escalonado. La cuenca de Boudinar es asimetrica, con depocentro en su borde occidental asociado al funcionamiento de la falla transtensiva dextra de Boudinar. Entre ambas cuencas, Ras Tarf constituye un horst de rocas volcanicas. Todas estas fallas con actividad actual determinan una extension paralela a la costa.

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Reply to the comment by A. G. Jones et al. on “Deep resistivity cross section of the intraplate Atlas Mountains (NW Africa): New evidence of anomalous mantle and related Quaternary volcanism”

Tectonics (2012)

Farida Anahnah Jesús Galindo‐Zaldívar Ahmed Chaloüan Antonio Pedrera Patricia Ruano

[1] Scientific discussion and different points of view are a basis of the advancement of knowledge. We acknowledge the comments of Jones et al. [2012] as an opportunity to publicly discuss the structure and origin of the Atlas Mountains. Moreover, we welcome the opportunity to compare our results with those recently published by the group responsible for the comment [Ledo et al., 2011], although it is not pertinent to comment in detail on a paper published in another journal. We also wish to remark that the paper of Ledo et al. [2011] was reviewed and published during the revision period of our contribution [Anahnah et al., 2011]; therefore, they are two different approaches and data sets, measured in different sites and by different instruments for the same region, lending readers the chance to compare different interpretations. The main differences on the data sets are: the profile of Anahnah et al. [2011] compared with the profile of Ledo et al. [2011] is 170 km longer, vertical magnetic data were obtained and lower frequencies were recorded. [2] We regret the style and way used by Jones et al. [2012]. We shall answer only those comments of Jones et al. [2012] related to objective issues. [3] One of the final conclusions of Jones et al. [2012] might serve as the starting point of our reply:

10.1029/2012tc003116

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Citations (3)

Is there an active subduction beneath the Gibraltar orogenic arc? Constraints from Pliocene to present-day stress field

Journal of Geodynamics (2010)

Antonio Pedrera Ana Ruiz‐Constán Jesús Galindo‐Zaldívar Ahmed Chaloüan C. Sanz de Galdeano

Eurasian Plate

Collision zone

Obduction

Stress field

Seismotectonics

10.1016/j.jog.2010.12.003

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Citations (90)

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

Tectonics (2018)

Jesús Galindo‐Zaldívar Gemma Ercilla Ferrán Estrada Manuel Catalán Elia d’Acremont

Abstract 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.

10.1029/2017tc004941

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Citations (33)

Evolution Néogène du bassin de Tétouan-Martil, Rif septentrional, Maroc.

Geogaceta (1994)

M. Benmakhlouf Ahmed Chaloüan

EnglishTetouan-MartHpost-nappes basin is opened by two rifting stages: the first in late Oligocene-Burdigalian times, is accompanied by ductile normal faults in Aquitanian-Burdigalian rocks; the second of post Burdigaiian and pre-PHocene age, has produced two low angle norma/ fault systems, trending NE-SW and NW-SE, leading to the collapse of this basin francaisLe bassin de Tetouan-Martil a connu au cours de son histoire geologique deux episodes de deformations distensives lies a des riftings neogenes de la mer d'Alboran. Le premier, d'âge Oligocene superieur a Burdigalien, a produit des flexures et des failles normales ductilesfragiles.dans des gneiss et micaschistes.et des failles normales synsedimentaires dans les formations aquitano-burdigaliennes

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Citations (7)