Evolution tectonique mio-quaternaire du fosse de Kasserine (Tunisie centrale); implications sur l'evolution geodynamique recente de la Tunisie

Philip, H.; Andrieux, Jean; Dlala, Mahmoud; Chihi, Lassaad; Ayed, Naceur

doi:10.2113/gssgfbull.ii.4.559

Cited by 72 publications

(40 citation statements)

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“…Seisms associated with the paleoseismic events are induced by seismic shocks, affecting the Neogene clay-sandy sediments. The whole in situ observations (Shäffer 1980;Kamoun 1981;Hfaiedh 1983;Ben Ayed 1986;Philip et al 1986;Gueddiche 1992;Rebaï 1992;Dlala and Rebaï 1994;Chihi et al 2000) show the coexistence of compressional and extensional structures during the Quaternary period (Fig. 10).…”

Section: Seismicitymentioning

confidence: 96%

“…The installation of overthrust folds is associated with opening of the grabens in central and northeastern Tunisia in extensional strike-slip context (Ben Ayed 1986;Chihi 1995;Chihi and Philip 1998;Bédir 1995;Zouaghi et al 2009;Melki et al 2010). A generalized compressional stress is showed at the Quaternary.…”

Section: Regional Geodynamic Evolution and Tectonic Inheritancementioning

confidence: 97%

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Neogene sediment deformations and tectonic features of northeastern Tunisia: evidence for paleoseismicity

et al. 2010

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The Neogene stratigraphic series is characterized by predominant clayey facies alternated by other sand layers. The outcrop and subsurface studies show varied and complex styles of deformations and lead to relate the structures to paleoseismic events. The seismicity of eastern onshore and offshore Tunisian margin follows the master fault corridors oriented globally N-S, E-W, and NW-SE that correspond to the bordering faults of grabens and syncline corridors and associated faulted drag fold structures oriented NE-SW. Epicenters of magnitudes between 3 and 5 are located along these border fault corridors. The Neogene strata record brittle structures, including numerous and deep faults and fractures with straight and high-angle dipping planes. The structuring of NE-SW en echelon folds and synclines inside and outside NW-SE and E-W right lateral and N-S and NE-SW left lateral tectonic corridors indicates the strike-slip type of bordering faults and their seismogenic nature. Wrench fault movements that induce mud and salt diapirs, mud volcanoes, and intrusive ascensions are related to seismic shocks. Seismic waves caused by activity along one, or most likely, several tectonic structures would have propagated throughout the Quaternary cover producing seismites. The similarity of deposits, structuring, and seismites between the TunisBizerte to the North and Hammamet-Mahdia to the South accredits the hypothesis that the seismic episodes might have affected sedimentation patterns along the Sahalian large geographic area. The paleoseismic events in northeastern Tunisia might be related to tectonic fault reactivations through time. This hypothesis is consistent with the geomorphologic context of the study area, characterized by several morphostructural lineaments with strong control on the sediment distribution, as well as uplifted and subsiding terrains. The estimated magnitude of the seismic events and the great regional tectonically affected areas demonstrate that the northeastern Tunisia experienced stress through the last geological episodes of its evolution. This Neogene kinematic reconstruction highlights the neotectonic system inducing the actual seismicity on this margin. Therefore, there is a straight relationship between deepseated faults and seismicity.

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Section: Seismicitymentioning

confidence: 96%

Section: Regional Geodynamic Evolution and Tectonic Inheritancementioning

confidence: 97%

Neogene sediment deformations and tectonic features of northeastern Tunisia: evidence for paleoseismicity

et al. 2010

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“…The Africa-Eurasia plate movements have been detailed by Dercourt et al (1986), Philip et al (1986), Soyer and Tricart (1987), Ben Ayed (1986), Dewey et al (1986), Martinez et al (1991), Boukadi (1994), Piqué et al (1998) and Abbes (2004). These authors described the episodes of divergence, convergence and lateral displacement between both plates.…”

Section: Introductionmentioning

confidence: 99%

The evolution of pre-existing structures during the tectonic inversion process of the Atlas chain of Tunisia

Dhahri

Boukadi

2010

Journal of African Earth Sciences

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“…It is characterized by the presence of NE-SW dissymmetric structures which have a developed hydrographic network because of several major faults oriented essentially NW-SE and E-W. Then, we note the existence of NE-SW faults that activated since Mesozoic time (Ben Ayed, 1986;Dlala, 1984;Philip et al, 1986;Chihi, 1995). The study area is also marked by the presence of a NW-SE trending basin where major hydrographic streams flow in.…”

Section: Study Areamentioning

confidence: 78%

Spatial Analysis of River Longitudinal Profils to Cartography Tectonic Activity in Kasserine Plain - Tunisia

Chaieb¹,

Rebai²,

Ghanmi³

et al. 2017

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ABSTRACT:The aim of this research is to detect the neotectonic activity and to map the seismic risk potential in the plain of Kasserine using the longitudinal profile of the Htab River and its tributaries. The adapted methodological approach is based on the extraction of the longitudinal profile and knickpoints, which are the main source of seismicity information in a plain filled up with more than 1000 m of silty deposit. In such a plain, compact structures are absent and thus we cannot detect the ordinary tectonic indices. The selected longitudinal profiles of the tributaries of the Htab River, extracted along the plain, show normal forms like river 1, 12 and 14 and abnormal ones such as 3, 5 and 7. The knickpoints distribution shows two main alignments trending NW-SE. The first one is in Semmama Mountain and it is represented in the structural map of Kasserine whereas, the second one is located in the plain of Kasserine and we think that it is caused by neotectonic activity. To confirm this hypothesis we use seismic records of the National Meteorology Institute since 2000. These data show seismic activity in the plain which is also a witness of a NW-SE alignment. Moreover, in situ investigations are performed and results pinpoint normal fault activity in the plain. Knickpoints, seismic records, and in situ investigation emphasize significant neotectonic activity affecting the thick quaternary plain of Kasserine.

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Evolution tectonique mio-quaternaire du fosse de Kasserine (Tunisie centrale); implications sur l'evolution geodynamique recente de la Tunisie

Cited by 72 publications

References 0 publications

Neogene sediment deformations and tectonic features of northeastern Tunisia: evidence for paleoseismicity

Neogene sediment deformations and tectonic features of northeastern Tunisia: evidence for paleoseismicity

The evolution of pre-existing structures during the tectonic inversion process of the Atlas chain of Tunisia

Spatial Analysis of River Longitudinal Profils to Cartography Tectonic Activity in Kasserine Plain - Tunisia

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