The　seismic　signals,　recorded　at　different　surface　points　during　the　propagation　of　the　seismic　waves　through　soil,　show　differences　due　to　the　soil-wave　interaction.　The　seismic　design　actions　should　be　evaluated　properly　in　case　of　distant　foundation　points　as　these　differences　can　be　great.　In　this　paper,　asynchronous　seismic　signals　are　generated　at　surface　starting　from　a　few　well-known　recordings　for　the　same　seismic　event.　The　EW　accelerometric　components　of　the　main　shock　recorded　at　two　recording　stations　(AQA,　AQV)　near　L＇Aquila　city　(Italy)　on　4-06-2009　are　the　generation　inputs.　The　seismic　wave　propagates　along　the　direction　between　AQA　and　AQV.　These　signals　are　representative　of　a　possible　asynchronous　excitation　applied　on　a　bridge.　Five　arrays　of　asynchronous　accelerograms　are　generated　at　the　foundations　of　the　bridge　to　perform　statistical　elaboration　of　the　results.　Different　bridge　positions　are　supposed　along　the　propagation　direction　of　the　wave　to　evaluate　the　spatial　variability　of　the　generated　signals.　The　generated　signals　at　AQA　and　AQV　stations　are　compared　with　the　available　recordings　at　the　same　points　(generation　inputs)　in　term　of　power　spectra,　acceleration　and　displacement　response　spectra.　Finally,　the　most　detrimental　soil　distortions　for　the　bridge　deck　are　calculated　for　some　bridge　positions.