The L’Aquila earthquake occurred the 6th April 2009, causing several casualties and damages to a large number of buildings and infrastructures. The event was a 6.3 moment magnitude (Mw), with epicenter located in the vicinity of the L’Aquila town. Among the severely damaged infrastructures, an important water pipeline (900 liters/sec, pressure 40 bars) located ca. 5 km ENE from L’Aquila town (near the Paganica village) was also partially destroyed during the major event.
The damages were likely produced by surface co-seismic displacements due to the fault slip occurred at depth, as the pipeline runs perpendicularly across the estimated position of the fault trace at surface. In the earthquake aftermath, the Italian Department of Civil Protection contributed to the remedial works for its restoration and to mitigate potential risks for the population. In this scenario, the GMG installed a Robotic Total Station to measure eventual post-seismic deformations that could have caused more damage to the water pipe itself. The RTS measured continuously for about a year the movements occurred to a set of 9 optical prisms with a sampling time of 2-4 hours. Despite the monitored area was spatially limited, the analysis conducted produced detailed information on the post-seismic behavior of the fault reactivated during the main shock.