On the 6th April 2009 a Mw 6.3 earthquake caused significant damage in L'Aquila and surrounding areas, central Italy. 297 people were killed, 1000 injuried, 66,000 made homeless. The main shock was preceded by foreshocks since December 2008, and aftershocks are still occurring. A huge amount of multidisciplinary data set that includes: seismological, geodetic, structural, geochemical, geomorphological, and remotely sensed data has being collected since the start of the seismic sequence. Thus the L'Aquila event can be considered a natural laboratory for better understanding the 3D anatomy and time evolution of a seismic sequence originated in an immature extensional scenario characterized by strongly segmented and overlapping master fault segments that are not yet fully linked. This session aims to provide a forum for all researchers involved on the L'Aquila event to present and discuss their results, and draw improved guidelines for future multidisciplinary investigations of complex seismogenic fault systems.