Abstract
<em>The 2016 August 24 Amatrice earthquake occurred at 03:36 local time in Central Apennines Italy with an epicentre at 43.36<sup>°</sup>E, 38.76<sup>°</sup>N, Istituto Nazionale di Geofisica e Vulcanologia (INGV), few kilometers north of the city of Amatrice. The earthquake ruptured a North-West (NW)–South-East (SE) oriented normal fault dipping toward the South-West (SW) (Scognamiglio et al., 2016). High values of peak ground acceleration (~0.45 g) were observed close to Amatrice (3 stations being few kilometer distances from the fault). The present study presents an overview of the main features of the seismic ground shaking during the Amatrice earthquake. We analyze the ground motion characteristics of the main shock in terms of peak ground acceleration (PGA), peak ground velocity (PGV) and spectral accelerations (SA, 5 per cent of critical damping). In order to understand the characteristics of the ground motions induced by Amatrice earthquake, we also study the source-related effects relative to the fault rupture directivity.</em>
Highlights
On 24 August 2016, an earthquake occurred at 01:36 local time with an epicentre located close to Accumoli village, with an estimated magnitude Mw of 6.0 and its hypocentral at a depth of 8 km
The causative fault is normal according to the Moment Tensor (MT) solution
Comparison with empirical ground motion prediction illustrated that the observed ground motions seem coherent with ITA10 and region specific prediction equation MAL11 for short and medium periods
Summary
On 24 August 2016, an earthquake occurred at 01:36 local time with an epicentre located close to Accumoli village, with an estimated magnitude Mw of 6.0 and its hypocentral at a depth of 8 km (http://cnt.rm.ingv.it /event/7073641). The earthquakes caused about 300 fatalities and diffuse building collapses in the towns of Amatrice and Arquata del Tronto, and in villages nearby, as an effect of the proximity of the causative fault and of the high vulnerability of old constructions in cobblestone. The main shock was followed by a seismic sequence with about 20 aftershocks with magnitude greater than 4.0 (Gruppo di Lavoro INGV, 2016). The epicentre of the Amatrice earthquake was located at about 35 km north of the destructive magnitude 6.3 earthquake hitting L’Aquila seven years ago in 2009. The largest peak ground accelerations have been recorded at three closest stations of the Italian Accelerometric Network (RAN). We investigate the spatial and azimuthal distribution of peak ground motions, inferring the occurrence of a directivity effect
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