Near-field Response of a 1D-structure Alluvial Site Here, you find a case history of the complex strong motion responses at a site with an almost 1-D structure (Buia) in the near-field of four 5.2-6.0 Mw earthquakes in the Friuli Plain of Italy. In one case (September 15th 1976 09:21 GMT, Mw=6.0