Fault Planes, Fault Zone Structure and Detachment Fragmentation Resolved With High‐Precision Aftershock Locations of the 2016–2017 Central Italy Sequence

Three devastating earthquakes of MW ≥ 5.9 activated a complex system high-angle normal, antithetic, and sub-horizontal detachment faults during the 2016–2017 central Italy seismic sequence. Waveform cross-correlation based double-difference location nearly 400,000 aftershocks illuminate complex, fine-scale structures interacting fault zones. The Mt. Vettore–Mt. Bove (VB) normal exhibits wide damage zones, including bookshelf that intersects zone. In Laga domain, comparatively narrow, shallow dipping segment deep Gorzano progressively ruptures through zone in four subsequent ∼ 5.4 events. Reconstructed planes show is fragmented sub-horizontal, partly overlaying shear correlated with extent mainshock ruptures. We find new, reaching barrier coincides bend VB may play role controlling rupture evolution.