|       The spatial variation of seismic ground motions denotes the differences  in the seismic time histories at various locations on the ground  surface. This text focuses on the spatial variability of the motions  that is caused by the propagation of the waveforms from the earthquake  source through the earth strata to the ground surface, and it brings  together the various aspects underlying this complicated phenomenon.   Topics covered include:    Evaluation of the spatial variability from seismic data recorded at  dense instrument arrays by means of signal processing techniques   Presentation of the most widely used parametric coherency models, along with brief descriptions of their derivation   Illustration of the causes underlying the spatial variation of the motions and its physical interpretation   Estimation of seismic ground-surface strains from single station data, spatial array records, and analytical methods   Introduction of the concept of random vibrations as applied to  discrete-parameter and continuous structural systems on multiple  supports   Generation of simulations and conditional simulations of spatially variable seismic ground motions   Overview of the effects of the spatial variability of seismic motions  on the response of long structures, such as pipelines, bridges and dams,  with brief descriptions of select seismic codes that incorporate  spatial variability issues in their design recommendations
   This book may serve as a tutorial and/or reference for graduate  students, researchers and practicing engineers interested in advancing  the current state of knowledge in the analysis and modeling of the  spatial variation of the seismic ground motions, or utilizing spatially  variable excitations in the seismic response evaluation of long  structures. | 
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