A targeted exploration of the dependence of seismic activity on the time of day continues for about a century and a half. During this time, numerous scientific studies have been done on the diurnal periodicity in the occurrence of earthquakes. In this work, we present the first results of a study of diurnal periodicity in the occurrence of weak earthquakes by the example of individual seismically active zones of the Zhongar North Tian Shan region. The research was performed on the data on number of earthquakes with energy classes (K = logE, J) equal to 5, 6, 7 and 8, which arose within the North Tian Shan (1), Zhongar (2), Halyktau (3) and Ketmen (4) zones. To do this, by counting the number of earthquakes of corresponding energy that occurred during each hour, a time series of hourly values of number of shocks for the entire time period was compiled. Then, using the method of superposition of periods, the number of seismic events for each hour over the entire time interval is summed up, and a graph of the average daily course of the number of earthquakes was compiled. Studies have established the existence of diurnal periodicity in the realization of weak earthquakes and microquakes. It was most clearly observed for seismic events with K ≤ 6 for the North Tien Shan, Zhongar, Ketmen, and K ≤ 7 for Halyktau zones. With an increase in energy class (magnitude) of earthquakes, the observed pattern weakens and practically disappears for shocks with K ≥ 7 for the earthquakes, Zhongar, Ketmen and with K ≥ 8 for the Halyktau zones. The obtained graphs of the diurnal sequence of seismicity are identical to the analogous curves of diurnal variation in the numbers of weak earthquakes allocated for other regions (areas) of the globe.

中文翻译：

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中阿尔北天山地区弱地震的昼夜周期性

对地震活动对一天中时间的依赖性的有针对性的探索持续了大约一个半世纪。在此期间，已经对地震发生的昼夜周期性进行了大量科学研究。在这项工作中，我们以中阿尔北天山地区的单个地震活动带为例，展示了弱地震发生的昼夜周期性研究的第一个结果。研究对象为北天山 (1)、中雅尔 (2)、哈雷克套 (3) 地震能量等级 (K = logE, J) 等于 5、6、7 和 8 级的地震次数数据。 ) 和 Ketmen (4) 区。为此，通过计算每小时发生的相应能量的地震次数，编制了整个时间段内冲击次数的小时值时间序列。然后，采用周期叠加的方法，将整个时间间隔内每小时的地震事件数相加，编制了地震数日均过程曲线图。研究已经确定了在弱地震和微震的实现中存在昼夜周期性。对于北天山、中雅尔、克特门和 K ≤ 7 的哈雷克套带的地震事件，观察到的地震事件最为清楚。随着地震能量等级（震级）的增加，对于 K ≥ 7 的地震、Zhongar、Ketmen 和 Halyktau 带的 K ≥ 8 的冲击，观测到的模式减弱并几乎消失。