Distribution of the creepex-magnitude correlation parameter for big-depth seismicity in the context of global tectonics

Abstract

In a number of the author’s papers, the successful application of creepex-parameter of seismicity in the problems of geodynamic research of preparation areas of large events by time-changing both the creepex value in the vicinity of their sources and the pair correlation coefficient of creepex Cr(t) and magnitude MS(t) graphs (the creepex-magnitude correlation KCOR) in accompanying earthquakes swarms or during the preparation of a large shock was demonstrated. With the transition to regional and global levels of research on the KCOR change, the influence of big-depth seismicity (H≥50 km), distributed along the regional and global deep faults closest to the focal zone on the processes of source preparation was discovered. In this paper, the dynamics of KCOR parameter for the entire period covered by the CMT global catalog along the main Earth’s seismic belts is considered. The “main belts” are the global lineaments detected by the GIS-ENDDB system, in the 10% confidence band of which the 100% of all Globe earthquakes with MS≥7.5 are located. In KCOR dynamics a pattern of high correlation of MS(t) and Cr(t) sets was revealed on the eve of several major earthquakes (called “key ones”). This can indicate the creation of a special organized environment state during their preparation, possibly associated with the environment consolidation along the seismic belts (in the case of inverse correlation of MS(t) and Cr(t)), or with increased environmental variability (in the case of direct correlation). The periodic nature of KCOR time-change on a global scale is shown (in the case of its calculation with a fixed size of a time-sliding series), possibly associated with periodic fluctuations in the Earth’s rotation speed.