For the seismic analysis of complex or nonlinear extended structures, it is useful to generate a set of properly correlated earthquake accelerograms that are consistent with a specified seismic hazard. A new simulation approach is presented in this paper for the generation of ensembles of spatially correlated accelerograms such that the simulated motions are consistent with (i) a parent accelerogram in the sense of temporal variations in frequency content, (ii) a design spectrum in the mean sense, and (iii) with a given instantaneous coherency structure. The formulation is based on the extension of stochastic decomposition technique to wavelet domain via the method of spectral factorization. A complex variant of the modified Littlewood-Paley wavelet function is proposed for the wavelet-based representation of earthquake accelerograms, such that this explicitly brings out the phase information of the signal, besides being able to decompose it into component time-histories having energy in non-overlapping frequency bands. The proposed approach is illustrated by generating ensembles of accelerograms at four stations.

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seismic analysis of complex or nonlinear extended structures seismic hazard motions method of spectral factorization variant spectrum temporal variations simulation approach modified littlewoodpaley wavelet function nonoverlapping frequency mean sense wavelet domain of stochastic decomposition technique phase information of the signal accelerogram waveletbased representation of earthquake accelerograms instantaneous coherency

Kaushik Sarkar, Riya C. George, Vinay K. Gupta,.Wavelet-based generation of spatially correlated accelerograms. 87 (0),116-124.

Kaushik Sarkar, Riya C. George, Vinay K. Gupta,"Wavelet-based generation of spatially correlated accelerograms" 87

Kaushik Sarkar, Riya C. George, Vinay K. Gupta,"Wavelet-based generation of spatially correlated accelerograms"