Evidence for diurnal periodicity of earthquakes from midnight to daybreak.

Natl Sci Rev · 2019 · PMC8291617 · PMID 34691965

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a weak trendno p-value reported

Spectrum stacking Time-frequency analyses can only present a weak trend in the spectrum.

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a significant trendno p-value reported

Time-frequency analyses can help us to identify the dominant periods within each window; thus, we can observe a significant trend in the spectrum if the spectrum in each window is similar to its neighbors.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.