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SUN-MOON TIDES AND INDUCED SEISMICITY AT THE MINES IN THE KHIBINY MASSIF (NE OF THE FENNOSCANDIAN SHIELD)
Abstract
It is known that the solar-moon tides (SMT) influence often serves as a trigger releasing seismic energy in a prepared area of the earth's crust. The regular increase in the number of earthquakes during the syzygy and perigee was empirically determined at the end of the 19th century by A. Perret [1]. The tidal force reaches its highest value when the perigee coincides with syzygy, which occurs once a year. The such pattern is observed for rock bursts (RB) also. However, it should be noted that the most tide influence studies have been carried out on a global scale for strong earthquakes and for large RB. As for induced seismicity (IS) the conducted system studies are few. The paper presents the results of a study of the relationship of SMT with the induced seismicity of two large mines in the Khibiny alkaline massif (NE Fennoscandian shield). The tasks of the research included obtaining answers to the following questions: - is there a noticeable effect of SMT on the IS of mines? - is it possible to predict of the increased probability of RB on the basis of a joint analysis of the time series of seismic events and moon phases? - which parameters of the tides have the greatest impact? - is this influence on rock massifs located in different structural blocks (different mines) homogeneous or not? The studies have revealed a stable relationship the recorded IS with the moon phases (the relative position of the Moon-Sun-Earth). Graphs of the distribution of frequency and the total energy by the moon days for the Kirovsk mine, located in the same geological background that Rasvumchorr mine, but at 8 km West from it, showed significant differences in the extremes. But for different mines the nature of the correlation is significantly different, which indicates the domination of the influence of tectonics and parameters of the local field of stress-strain state.
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