An-Najah National University

Radwan J. El-Kelani,

 

 
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  • Tuesday, November 22, 2005
  • 3-dimensional gravity Model of the southern Jordan Dead Sea Transform
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  • A three-dimensional interpretation of the newly compiled Bouguer anomaly

    map of the Dead Sea Transform (DST) is presented. A high-resolution 3-D model

    constrained with the seismic results reveals a possible crustal thickness and density

    distribution beneath the Rift. The negative Bouguer anomalies (-130 mGal) along

    the axial portion of the Rift floor, as deduced from the modelling results, are mainly

    caused by deep seated basins of light sediments (≥10 km). The inferred zone of

    intrusion coincides with the maximum gravity anomaly over the eastern flank of the

    Rift. The intrusion is displaced at different sectors along the NW-SE direction. The

    zone of the maximum crustal thinning (≤30 km) is attained in the western sector at the

    Mediterranean. The southeastern plateau, on the other hand, shows by far the largest

    crustal thickness in the region (38-42 km). Linked to the left lateral movement of ~

    107 km at the boundary between the African and Arabian plates, and constrained with

    recent seismic data, a small asymmetric topography of the Moho beneath the DST

    was modelled. The thickness and densities of the crust ranging from 2650-2900 kg/m

    suggest that the DST underlain by a continental crust. The deep basins, the relatively

    large nature of the intrusion and the asymmetric topography of the Moho, lead to

    the conclusion that a small-scale asthenospheric upwelling(?) might be responsible

    for the thinning of the crust and subsequent rifting of the DST during the left lateral

    movement.

     
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Radwan J. El-Kelani
Associate Professor in Applied and Environmental Engineering Geophysics
 
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