The April 2009 L'Aquila (Italy) seismic sequence: recordings in the <em>Anfiteatro Flavio (</em>Colosseum)

We show a preliminary study concerning the interaction of the seismic wave-field coming from aftershocks of the 2009 seismic sequence in Abruzzo and the structure of the Anfiteatro Flavio, usually called Colosseum. By using mainly Arias intensity, we assess how the incoming energy beneath the foundations is convoyed into the monument, through what preferential frequencies such process takes place, how the trapped energy increases amplitude vibration with floors. Moreover, we also investigate the role played by the near-surface geology in generating differential motions below the monument foundations. In addition we also check, in a preliminary way, the foundation dynamical behaviour under the action of the incoming wave-field.