Evidence for diurnal periodicity of earthquakes from midnight to daybreak.
Evidence for diurnal periodicity of earthquakes from midnight to daybreak.
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从午夜到黎明地震日周期性的证据
DOI：
10.1093/nsr/nwy117
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发表时间：
2019-10
影响因子：
20.6
通讯作者：
Yao Z
中科院分区：
文献类型：
--
作者：
Hao J;Zhang J;Yao Z
以前，地震目录不足和缺乏方法，使其具有挑战性，如果不是不可能的，以确定地震发生的主导时期。自2002年以来，随着日本密集分布的地震台站的出现，在30 km深度内的大陆下已记录了410 642次M1.0+地震，这为识别地震周期性提供了极好的数据集。我们利用时频分析和逐日叠加的方法对星表进行了处理，这两种方法在从强随机噪声中提取弱周期信号方面具有很强的能力。我们集中在0：00到6：00（即从午夜到黎明）的时间段，这是一个可靠的时间窗口，因为它具有最低的文化噪声的影响，弱地震的可检测性高得多。我们成功地观察到12小时和24小时的两个明显的周期性，这是比以前在文献中提出的每两周的周期性小得多。合成地球潮汐在故意忽略月球的贡献后，呈现出与地震相似的主导周期。这可能表明地震的主要周期在统计上与太阳而不是月球有关。以15分钟或1小时为间隔的每日地震叠加次数显示，峰值在1：30左右，而不是通常预期的3：00至4：00。此外，越大的地震，叠加结果的变化越明显，从1.0级到4.0级的各种震级下限的趋势非常一致。这些发现解决了自1886年以来关于地震周期性是否存在的争论，并可能为揭开地震之谜打开一扇窗。
Previously, inadequate earthquake catalogs and the lack of method made it challenging, if not impossible, to determine the dominant period of earthquake occurrence. With the advent of densely distributed seismic stations in Japan since 2002, 410 642 M1.0+ earthquakes have been cataloged under the mainland within 30-km depth, which provide a superb dataset to identify the periodicity of earthquakes. We processed this catalog using time-frequency analyses and daily stacking, which are powerful in extracting weak periodical signal from strong random noises. We concentrated on the time sector from 0:00 to 6:00 (i.e. from midnight to daybreak), which is a reliable time window for much higher detectability of weak earthquakes, since it has the lowest affects from cultural noises. We successfully observed two apparent periodicities of 12- and 24-hour, which are much smaller than the fortnightly periodicity presented previously in the literature. Synthetic earth tides, after intentionally ignoring the contribution from the Moon, present similar dominant periods as the earthquakes. This may indicate that the dominant period of earthquakes is statistically associated with the Sun rather than the Moon. The daily stacking number of earthquakes using a 15-minute or 1-hour interval shows a peak around 1:30, rather than usually expected 3:00 to 4:00. In 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 M4.0. These 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.
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影响因子：
3
作者：
Nanjo, K. Z.;Ishibe, T.;Hirata, N.
通讯作者：
Hirata, N.
DOI：
10.1073/pnas.1524316113
发表时间：
2016-08-02
影响因子：
11.1
作者：
van der Elst, Nicholas J.;Delorey, Andrew A.;Johnson, Paul A.
通讯作者：
Johnson, Paul A.
影响因子：
18.3
作者：
Houston, Heidi
通讯作者：
Houston, Heidi
影响因子：
3
作者：
Atef, Ali H.;Liu, Kelly H.;Gao, Stephen S.
通讯作者：
Gao, Stephen S.
影响因子：
18.3
作者：
Peng, Zhigang;Walter, Jacob I.;Anandakrishnan, Sridhar
通讯作者：
Anandakrishnan, Sridhar