Styles of salt tectonics in the Sab’atayn basin,onshore Yemen     

Gabor Tari  Rudi Dellmour  Emma Rodgers  Chloe Asmar  Peter Hagedorn  Adel Salman 《Arabian Journal of Geosciences》2016,9(10):570

A variety of distinct salt tectonic features are present in the Sab’atayn Basin of western Yemen. Based on the interpretation of regional 2D seismic reflection data and exploration wells in the central part of the basin, an Upper Jurassic evaporite formation produced numerous salt rollers, salt pillows, reactive, flip-flop, and falling diapirs. Due to regional extension, halokinetics began as soon as the early Cretaceous, within just a few million years after the deposition of the Tithonian Sab’atayn evaporite sequence, by formation of salt rollers. The salt locally formed salt pillows which evolved to reactive and active salt diapirs and diapiric salt walls as the result of renewed, but low-strain extension in the basin. Some of the diapiric walls further evolved into falling diapirs due to ongoing extension. As the result of a prominent extensional episode at the end of the Cretaceous, many of the diapiric walls in the basin are controlled by large normal faults on their updip flanks. As the post-Cretaceous sedimentary cover is largely missing in the study area, the assumed reactivation of salt structures during the Cenozoic remains poorly constrained. The interpreted changes in the style of salt tectonics in the Sab’atayn Basin offer a better understanding of the regional-scale tectonic development of the Arabian plate during the late Jurassic and Cretaceous.  相似文献   

Assessment of hot groundwater in an arid area in Tunisia using geochemical and fuzzy logic approaches     

Belgacem Agoubi  Faiza Souid  Adel Kharroubi  Abdelaziz Abdallaoui 《Environmental Earth Sciences》2016,75(24):1497

In this study, thermal groundwater from arid area in southeastern Tunisia was assessed for irrigation use. For this purpose, thirty-one water samples were collected and physiochemical parameters (EC, pH, TDS, major ions) were measured and analyzed. A fuzzy logic model was developed in which six parameters were integrated: electrical conductivity, sodium adsorption ratio, sodium percentage, Kelly ratio, permeability index and temperature. The membership functions for a fuzzy logic model were developed using linguistic terms and trapezoidal shapes. The fuzzy logic model developed was validated with a dataset of chemical analyses from groundwater sampled in the study area. The assessment indicated that 26% of the samples were in the “good” class, 10% in the “good to permissible” class, 55% are in the “permissible” class, 6% are in the “permissible to harmful” class and 3% were considered to be harmful and therefore unsuitable for use in irrigation. The effectiveness, simplicity and robustness of the fuzzy model assessment make this approach a more consistent and reliable way of assessing water quality than conventional methods of assessing water quality data.  相似文献   

Source parameters and ground motion of the Suez-Cairo shear zone earthquakes,Eastern Desert,Egypt   总被引：1，自引：0，他引：1  

K. M. Abou Elenean  Adel M. E. Mohamed  H. M. Hussein 《Natural Hazards》2010,52(2):431-451

Three felt earthquakes with local magnitudes 4.0 (June 29th, 2000), 4.2 (July 07th, 2005) and 3.7 (October 30th, 2007) occurred to the southeast of Cairo along the Suez-Cairo shear zone. Being the most well recorded events by the Egyptian National Seismic Network (ENSN) in this area, they provide us an excellent opportunity to study the tectonics, the stress field, the source parameters, and the expected ground motion at Cairo. The focal mechanisms of the three events based on the first motion P-wave polarities indicate mainly normal faulting with a slight strike-slip component along nodal planes trending nearly EW and NW–SE. The three focal solutions imply a rejuvenation of the pre-existing EW and NW–SE faults due to a partly transfer of rifting deformation from the Red Sea-Gulf of Suez along these trends. Dynamic source parameters of these events are estimated from the P-wave spectra of the closest ENSN stations. The average values of the seismic moment, stress drop, rupture radius, and fault dislocation are estimated from six stations and interpreted in the context of the tectonic setting. These parameters in addition to the effects of site and path are used to synthesize the ground motion seismograms using stochastic modeling technique at the recorded stations and at some strategic sites.  相似文献   

Extended linear-sigma model: transport properties of QCD matter at finite temperature     

Adel Nasser Tawfik  Azzah Elshehri 《Astronomische Nachrichten》2024,345(2-3):e240004

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An Evaluation of Some Geophysical Methods for Water Exploration in the Piedmont Area by T. J. Joiner, J. C. Warman, and W. L. Scarbrough January-February, 1968     

Adel A. R. Zohdy 《Ground water》1968,6(4):38-39

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The fast Hankel transform1     

Adel A. Mohsen  E.A. Hashish 《Geophysical Prospecting》1994,42(2):131-139

An efficient algorithm is presented to compute the Hankel transform. The algorithm yields simultaneously all the required weights for a given order of the Bessel function using the fast Fourier transform. An additional shift is introduced to the filter abscissa besides Koefoed's shift to give a better filter performance.  相似文献   

Estimation of frequency dependent coda wave attenuation structure at the vicinity of Cairo Metropolitan Area   总被引：1，自引：0，他引：1  

Salah El-Hadidy  M. E. Mohamed Adel  Ahmed Deif  Ahmed Sayed Abu El-Ata  S. R. Moustafa Sayed 《Acta Geophysica》2006,54(2):177-186

Estimation of seismic wave attenuation in the shallow crust in terms of coda wave Q structure previously investigated in the vicinity of Cairo Metropolitan Area was improved using seismograms of local earthquakes recorded by the Egyptian National Seismic Network. The seismic wave attenuation was measured from the time decay of coda wave amplitudes on narrow bandpass filtered seismograms based on the single scattering theory. The frequency bands of interest are from 1.5 to 18 Hz. In general, the values obtained for various events recorded at El-Fayoum and Wadi Hagul stations are very similar for all frequency bands. A regional attenuation law Q _c = 85.66 f ^0.79 was obtained.  相似文献   

Expansion theory for the elliptic motion of arbitrary eccentricity and semi-major axis     

Mohamed Adel Sharaf 《Earth, Moon, and Planets》1993,60(1):47-58

In this paper of the series, the time transform and the explicit exact forms of the time will be established in terms of the sectorial variables _j ⁽ⁱ⁾ introduced in Paper IV (Sharaf, 1982) to regularize the highly oscillating perturbation force. Simple recurrence formulae are given to facilitate the computations. The formulations are general in the sense that they are valid whatever the types and the number of sectors forming the divisions situation of the elliptic orbit may be. Moreover, the constants of integration for the explicit forms of the time are determined in a way that it gives for these forms its generality during any revolution of the body in its Keplerian orbit.  相似文献   

General integral transform of the exponential integrals     

Mohamed Adel Sharaf 《Astrophysics and Space Science》1979,63(2):295-317

General integral transform of the exponential integralsE _n is considered and will be denoted asB _(k) ⁿ (). Different expressions and the equations satisfied byB _(k) ⁿ are developed. Two-term recurrence formula forB _(k) ⁿ (0) and three-term recurrence formula forB _(k) ⁿ (); 0 will be established for a givenk1 andn=2,3, ...,N. The computational algorithms based on these formulae are also constructed for the casesk=1,2,3, andn2. Finally the numerical results fork=2,3 andn=2(1)25 are presented to 15-digit accuracy  相似文献   

Does a representative volume element exist for fatigue life prediction? The case of aggregate composites     

Adel Lachihab  Karam Sab 《国际地质力学数值与分析法杂志》2008,32(9):1005-1021

In a previous work, discrete modeling and a statistical approach were used to quantify the minimal representative volume element (RVE) size for aggregate composites, such as bituminous materials in the linear elastic regime (Comput. Mater. Sci. 2005; 33 :467–490). In this paper, the discrete model is extended to strain‐softening behavior under cyclic loading. The existence of a RVE for fatigue life prediction is numerically proved and its minimal size is determined. It is found that it is much larger than the minimal RVE size in the elastic regime. Copyright © 2007 John Wiley & Sons, Ltd.  相似文献