Diurnal Periodicity of Weak Earthquakes in the Zhongar North Tian Shan Region
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Diurnal Periodicity of Weak Earthquakes in the Zhongar North Tian Shan Region Aluadin Sydykov1 · Alla B. Sadykova1 · Akgenzhe O. Siylkanova1,2 Received: 9 June 2020 / Accepted: 21 October 2020 © Springer Nature B.V. 2020
Abstract 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 earth‑ quakes 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 seismic‑ ity are identical to the analogous curves of diurnal variation in the numbers of weak earth‑ quakes allocated for other regions (areas) of the globe. Keywords Earthquakes · Catalog · Parameters · The magnitude of seismic activity
* Aluadin Sydykov sydykov5381‑[email protected] Alla B. Sadykova sadykova5381‑[email protected] Akgenzhe O. Siylkanova siylkanova5381‑2@national‑univesity.info 1
Laboratory of Regional Seismicity, Institute of Seismology, 75A Al‑Farabi Str., 050060 Almaty, Republic of Kazakhstan
2
Department of Geophysics, Satbayev University, 22a Satpaev Str., 050013 Almaty, Republic of Kazakhstan
13
Vol.:(0123456789)
Surveys in Geophysics
1 Introduction A targeted search for the dependence of seismic activity on the time of day lasts for about a century and a half. Throughout this time, numerous scientific studies have been carried out on the diurnal periodicity in the occurrence of earthquakes. A review, bibliography and analysis of the results are given in Zhuravlev et al. (2006), Belyakov et al. (2011). In accordance with them, the most reliable results from observation of diurnal periodicity in the manifestation of earthquakes were obtained in the second half of the twentieth century. This is b
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