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In order to investigate the importance of including strike-variable geometry and the knowledge of historical and paleoseismic earthquakes when modelling static Coulomb stress transfer and rupture propagation, we have examined the August-October 2016 and January 2017 central Apennines seismic sequence (Mw 6.0, 5.9, 6.5 in 2016 (INGV) and Mw 5.1, 5.5, 5.4, 5.0 in 2017 (INGV). We model both the coseismic loading (from historical and paleoseismic earthquakes) and interseismic loading (derived from Holocene fault slip-rates) using strike-variable fault geometries constrained by fieldwork. The inclusion of the elapsed times from available historical and paleoseismological earthquakes and on faults enables us to calculate the stress on the faults prior to the beginning of the seismic sequence. We take account of the 1316-4155 years elapsed time on the Mt. Vettore fault (that ruptured during the 2016 seismic sequence) implied by paleoseismology, and the 377 years and 313 years elapsed times on the neighbouring Laga and Norcia faults respectively, indicated by the historical record. The stress changes through time are summed to show the state of stress on the Mt. Vettore, Laga and surrounding faults prior to and during the 2016-2017 sequence. We show that the build up of stress prior to 2016 on strike-variable fault geometries generated stress heterogeneities that correlate with the limits of the mainshock ruptures. Hence we suggest that stress barriers appear to have control on the propagation and therefore the magnitudes of the mainshock ruptures

geophysical journal international

Coulomb stress transfer and fault interaction over millennia on non-planar active normal faults: the Mw 6.5–5.0 seismic sequence of 2016–2017, central Italy