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Evidence for diurnal periodicity of earthquakes from midnight to daybreak

National Science Review 2019年第5期6卷 1016-1023页

作者： Jinlai Hao Jinhai Zhang Zhenxing Yao Key Laboratory of Earth and Planetary Physics Institute of Geology and Geophysics Chinese Academy of Sciences

Previously, inadequate earthquake catalogs and the lack of method made it challenging, if not impossible, to determine the dominant period of earthquake *** the advent of densely distributed seismic stations in Japan since 2002, 410 642 M1.0+ earthquakes have been cataloged under the mainland within30-km depth, which provide a superb dataset to identify the periodicity of *** processed this catalog using time-frequency analyses and daily stacking, which are powerful in extracting weak periodical signal from strong random *** concentrated on the time sector from 0:00 to 6:00(*** midnight to daybreak), which is a reliable time window for much higher detectability of weak earthquakes,since it has the lowest affects from cultural *** successfully observed two apparent periodicities of12-and 24-hour, which are much smaller than the fortnightly periodicity presented previously in the *** earth tides, after intentionally ignoring the contribution from the Moon, present similar dominant periods as the *** may indicate that the dominant period of earthquakes is statistically associated with the Sun rather than the *** daily stacking number of earthquakes using a15-minute or 1-hour interval shows a peak around 1:30, rather than usually expected 3:00 to 4:*** addition, bigger earthquakes show more evident variations in the stacking results, and the trend is very consistent for various lower limits of earthquake magnitude from M1.0 to *** discoveries settled the disputes on the existence of the periodicity of earthquakes since 1886 and may open a window to unravel the mystery of earthquakes.

关键词： periodicity of earthquakes time-frequency analyses ocean tide earth tide Local Mean time

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