Fig. 3 | Scientific Reports

Fig. 3

From: Interdecadal seismic periodicity modulated by solar and oceanic variability revealed from Chinese historical documents

Fig. 3

Relationships between ~ 10-year cyclic seismicity and solar activity. (a) Lead–lag correlations between 9–11-year filtered earthquake frequencies and sunspot numbers. (b) Comparison of time series with sunspots leading seismicity by 4 years, where the strongest positive correlation is observed (r = 0.32, p < 0.05). (c) Temporal comparison of unfiltered earthquake frequency and reconstructed solar irradiance. Positive values in (a) indicate that sunspot activity leads seismicity; negative values suggest the reverse.

Back to article page