Seismic Hazard Assessment and Local Site Effects on Dubai-Sharjah and Their Environs

Abstract eng:
This paper summarizes the results of seismic hazard assessment of the United Arab Emirates (UAE) and the influence of local site effects on the intensities of ground shaking on recently emerged mega projects in UAE major cities including Abu Dhabi, Dubai, Sharjah and their localities. The probabilistic seismic hazard assessment was based on: (1) recently developed new generation of ground motion prediction equations; (2) collection of catalogues of various degrees of completeness that were homogenized for temporal distribution of events; (3) source zones that were delineated based on their seismic activities and tectonics; and (4) activity parameters that were based on doubly bounded magnitude-frequency relationships. The local site effect is based on selected time histories that were chosen based on a target response spectrum. This target response was obtained from the results of the probabilistic seismic hazard assessment stated above. In addition, subsurface geotechnical data from several different sites were used to evaluate the effect of local site conditions on ground response during earthquake. Dynamic properties of soil for selected soil profiles have been generated and one-dimensional site response analysis has been conducted. Results are presented in terms of response spectral accelerations (RSA) with a breakdown of their range (S 0.2 and S 1 ) for different site classes, representative hazard spectra, de-aggregation and development of site amplification factors for Dubai-Sharjah and their environs.

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