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Complete seismic release of tectonic strain and earthquake recurrence in the Apennines (Italy)
Author(s) -
D'Agostino N.
Publication year - 2014
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1002/2014gl059230
Subject(s) - seismology , geology , induced seismicity , tectonics , seismic moment , earthquake prediction , magnitude (astronomy) , deformation (meteorology) , strain (injury) , strain rate , geodesy , fault (geology) , medicine , oceanography , physics , materials science , astronomy , metallurgy
Here I compare estimates of tectonic strain rates from dense Global Positioning System measurements with the seismicity released in the last ~500 years in the Apennines (Italy). The rates of seismic moment accumulation from geodesy and of historical seismic release by earthquakes agree within the uncertainties, ruling out significant aseismic deformation. Within the considered 400 km long section of the Apennines, this balance yields an average recurrence interval of 30–75 years for M W ≥6.5 events without requiring a future earthquake larger than those observed historically ( M W ~7). A minimum estimate of unreleased strain allows M W ≥6.5 and M W ≥6.9 events to be released in ~35 % and ~10 % of the central‐southern Apennines, respectively. The definition of the seismic potential for smaller events is more uncertain, and their occurrence remains a significant threat throughout the Apennines.