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Multichannel analysis of surface waves (MASW) for seismic site characterization using 2D genetic algorithm at Bahrah area, Wadi Fatima, Saudi Arabia

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Abstract

The present study deals with the seismic site classification of Bahrah area, Wadi Fatima, to characterize the local site conditions. The dynamic behavior of sediments was studied by the application of surface wave inversion. The multichannel analysis of surface waves (MASW) shallow geophysical technique was utilized for site classification. MASW survey was carried out at 66 sites along with 13 seismic refraction profiles at suitable localities. MASW and seismic refraction profiles were processed and compared with the available borehole data. The integration of MASW techniques with seismic refraction and borehole data progressively enhanced the subsurface visualization and reliability of the shear wave velocity estimation in the subsurface in the study area. The subsurface shear-wave velocity model was achieved by the solution of an inverse problem-based dispersion of surface waves and propagation in a vertically heterogeneous medium. The 2D genetic algorithm was employed for the inversion of dispersion curves to obtain velocity and thickness of subsurface layers. The depth to engineering bedrock and velocity of shear waves in the first 30 m was deciphered and mapped. The depth of bedrock in study area varies from 4 to 30 m, and V S 30 ranges from 320 to 800 m/s. The most of study area falls in B and C class categories in addition to few sites of D class according to the NEHRP guidelines.

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Acknowledgment

The authors gratefully appreciate the support by the Faculty of Earth Sciences, Deanship of Graduate Studies and particularly Geophysics Department, at King Abdulaziz University. We are thankful to our colleagues who provided expertise that greatly assisted the research.

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Correspondence to Faisal Rehman.

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Rehman, F., El-Hady, S.M., Atef, A.H. et al. Multichannel analysis of surface waves (MASW) for seismic site characterization using 2D genetic algorithm at Bahrah area, Wadi Fatima, Saudi Arabia. Arab J Geosci 9, 519 (2016). https://doi.org/10.1007/s12517-016-2544-1

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  • DOI: https://doi.org/10.1007/s12517-016-2544-1

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