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Authors: Zaccagnino, Davide* 
Telesca, Luciano* 
Doglioni, Carlo* 
Title: Correlation between seismic activity and tidal stress perturbations highlights growing instability within the brittle crust
Journal: Scientific Reports 
Series/Report no.: /12 (2022)
Publisher: Nature Publishing Group
Issue Date: 2-May-2022
DOI: 10.1038/s41598-022-11328-z
Keywords: body tides
solid earth tides
astronomical tuning
Subject Classification04.06. Seismology 
Abstract: Faults become more and more responsive to stress perturbations as instability mounts. We utilize this property in order to identify the different phases of the seismic cycle. Our analysis provides new insights about the features of impending mainshocks, which are proposed to emerge from a large-scale crustal-weakening preparation process whose duration depends on their seismic moments, according to the power-law T [Formula: see text] M[Formula: see text] for M[Formula: see text] [Formula: see text] 10[Formula: see text] N m. Moreover, further studies are performed about the impact of tidal stress perturbation on seismicity; in particular, the relationship between frequency-magnitude scaling and perturbations is discussed, showing that the sensitivity of earthquakes to solid Earth tides decreases as their magnitudes increase.
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