Abstract:Large mainshocks in the Uniform California Earthquake Rupture Forecast (UCERF) catalog appear to have been nonrandom in time in the northern California region. Magnitude M ≥ 6:4 earthquakes clustered significantly in the halfyearly solar declination cycle. The most likely explanation appears to be natural earthquake periodicity, because the semiannual bias (1) persists in historical and instrumental catalog subsets, regardless of foreshocks or aftershocks, (2) is not contradicted by pre-1850 data for northern… Show more
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