Morphotectonic analysis of the long-term surface expression of the 2009 L'Aquila earthquake fault (Central Italy) using airborne LiDAR data

• Published in: Tectonophysics 2015-03, Vol.644-645, p.108-121
• Main Authors: Civico, Riccardo, Pucci, Stefano, De Martini, Paolo Marco, Pantosti, Daniela
• Format: Article
• Language: English
• Subjects: Assessments; Boundaries; Faults; Geomorphology; Lidar; Rupture; Seismic hazard; Seismic phenomena; Topography
• ISSN: 0040-1951
• DOI: 10.1016/j.tecto.2014.12.024

In this paper we presenta morphotectonic study of the Paganica-San Demetrio fault system (PSDFS) responsible for the Mw6.1 April 6, 2009 earthquake (L'Aquila, Central Italy). The discrepancy observed between the length of the seismologic-geodetic modeled fault, the limited size of the primary coseismic surface ruptures and the significant morphological expression of the PSDFS stimulated a debate about the maximum rupture length of the PSDFS and its capability to generate larger magnitude events. To image the PSDFS long-term morphological expression and define its surface geometrical arrangement (length, number of fault splays and boundaries), we took advantage of a high-resolution airborne LiDAR dataset. LiDAR topography substantially increased our confidence in detecting even subtle tectonic-controlled morphologies. We define the PSDFS as a ~ 19 km-long fault system that displays a complex structural setting characterized by two different sectors: 1) the Paganica sector to the NW, with a narrow deformation zone, and 2) the San Demetrio sector to SE, where the strain is accommodated by several fault-splays disserting a wider Quaternary basin. We also defined a first-order hierarchy among the numerous fault splays across the PSDFS. The long-term geomorphic expression of the PSDFS suggests that it ruptured also involving the whole 19 km-long structure besides rupturing only small sections, as it occurred in 2009. This suggests a variable slip behavior. Empirical relations applied to this hypothesis allow up to M 6.6 earthquakes along the PSDFS. These results have a critical impart on the seismic hazard assessment of the area when compared with a M 6.1 event as the 2009.