On the Diurnal Periodicity of the Flow of Weak Earthquakes in the Territory of the Jungar-North Tien Shan Region

Abstract

The analysis of geological, geophysical and seismic parameters in the territories of the North Tien Shan and Halyktau zones was carried out due to the difference in the nature of the daily frequency of weak earthquakes in these zones. Data from the Vostochnyi (79-80°Е) profile and a map of the seismic activity of the Zhongar-North Tien Shan region were used for the analysis. It is shown that the territories of these zones are characterized by an abnormally high thickness of the sialic (granite-gneiss) layer of consolidated crust, which is one of the most characteristic structural and geophysical signs indicating the possibility of equally high seismicity in both zones. However, the data show that seismic activity in the territory of the Halyktau zone is more higher than in the territory of the North Tien Shan zone, which affects the amplitude of the daily frequency in the number of earthquakes in these zones. It is concluded that the lack of daily frequency in the number of earthquakes with energy class K = 7 in the North Tien Shan zone is due to insufficient information about such events and due to the more reduced seismic activity here