Figure 3 - uploaded by Alba Gil
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1: Earth's P-wave velocity, S-wave velocity, and density profiles as a function of depth. Values are from the Dziewonski and Anderson (1981) Preliminary Reference Earth Model (Shear, 2009).
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In this thesis I present a geophysical study that aims to define and characterize the crustal structure in the northern part of Morocco, especially beneath the Rif Cordillera. The geophysical data used in this thesis was acquired during the RIFSIS (2011) survey within the framework of the RIFSIS project, which was designated to overcome the lack of...
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Fractures that develop in coal seams threaten safety in many ways, but they can be predicted using fracture parameters derived from seismic data. However, the post-stack split shear waves are difficult to thoroughly separate by Alford rotation due to wavefield mixing. We propose a method of predicting fractures in a coal seam using multi-component...
Citations
... The Alboran Sea (150 km across with maximum depth of 2000 m) is bordered by Betic-Rif Cordillera to the north and the south, respectively, and underlain by continental crust (Comas et al. 1992) (Fig. 1). In its Rif Cordillera transect border, the thickness of sediments is clearly decreasing from west to east (Fig. 2) (Alba 2015) by a decrease of the continental crust itself in approximately the same direction (Ben Sari 1978;Tadili et al. 1986). The study region is characterized by Plio-Quaternary volcanic rocks that cause positive residual gravimetric anomalies (Vanié et al. 2005) in the Cap des Trois Fourches (9.8 Ma) (Hernandez and Bellon 1985). ...
... c Velocity and depth. In Alba (2015), this velocity model is based on an EW profile that is sampled from three shot records R3, R4, and R5. Rapid structural variations beneath the External Rif domain can be inferred from the deeper phases PcP and PmP recorded along this transect Within seismic profiles, the Nekor fault is known by remarkable signature (Ammar et al. 2007). ...
The study of 1000-km seismic reflection profiles, along the Northern Moroccan margin, allowed browsing new imaging in detail about the regional geological structures and their functioning. To achieve this goal, we elaborated a high-resolution depth model and a global tectonic sketch. The influence of recent tectonic activity is manifested by normal and strike-slip faults, trending mainly 70° N and 125° N. In this segment, the Nekor strike-slip fault seems to be connected to a secondary major fault system that changes direction from 30° N to 70° N, and changing behavior to left-lateral strike-slip fault with normal component. Analysis of local seismic activity recorded from 1990 to 2014 with moderate magnitudes activity shows alignments in clear superposition with the detected active faults in seismic reflection lines.
... The Alboran Sea (150 km across with maximum depth of 2000 m) is bordered by Betic-Rif Cordillera to the north and the south, respectively, and underlain by continental crust (Comas et al. 1992) (Fig. 1). In its Rif Cordillera transect border, the thickness of sediments is clearly decreasing from west to east (Fig. 2) (Alba 2015) by a decrease of the continental crust itself in approximately the same direction (Ben Sari 1978;Tadili et al. 1986). The study region is characterized by Plio-Quaternary volcanic rocks that cause positive residual gravimetric anomalies (Vanié et al. 2005) in the Cap des Trois Fourches (9.8 Ma) (Hernandez and Bellon 1985). ...
... c Velocity and depth. In Alba (2015), this velocity model is based on an EW profile that is sampled from three shot records R3, R4, and R5. Rapid structural variations beneath the External Rif domain can be inferred from the deeper phases PcP and PmP recorded along this transect Within seismic profiles, the Nekor fault is known by remarkable signature (Ammar et al. 2007). ...
The study of 1000-km seismic reflection profiles, along the Northern Moroccan margin, allowed browsing new imaging in detail about the regional geological structures and their functioning. To achieve this goal, we elaborated a highresolution depth model and a global tectonic sketch. The influence of recent tectonic activity is manifested by normal and strike-slip faults, trending mainly 70° N and 125° N. In this segment, the Nekor strike-slip fault seems to be connected to a secondary major fault system that changes direction from 30° N to 70° N, and changing behavior to left-lateral strike-slip fault with normal component. Analysis of local seismic activity recorded from 1990 to 2014 with moderate magnitudes activity shows alignments in clear superposition with the detected active faults in seismic reflection lines.
