Fig. 4From: Lessons from April 6, 2009 L’Aquila earthquake to enhance microzoning studies in near-field urban areasa Measures of PSA during the Parkfield earthquake 2004 (6 Mw) are reported near the active fault at the measure seismic stations (After Boore 2014b, modified); b Onna sector of Aterno River Valley: the records are for an aftershock of 3.2 MlBack to article page