Abstract
The study is devoted to a detailed analysis of observational data from the GRACE space system to clarify the parameters of a catastrophic earthquake with a magnitude of MW = 8.8, which occurred in the subduction zone near the coast of Chile. Digital maps of changes in the EWH parameter over the geoid contour in the investigated seismically active region of the Chilean earthquakes of 2014 and 2015 were constructed. It is shown that there is a negative correlation between the value of the geodynamic parameter H for a strong earthquake with M W = 8.8 (distance from the hypocenter to the position of the Earth-Moon barycenter) and the equivalent water height above the geoid EWH. The highest correlation coefficient between the parameters H and EWH equal to R = -0.61 was noted during the period of registration of the number of postseismic events in the region of Central Chile. In the course of further research study the representative class of earthquakes for a detailed analysis of the variability of the EWH parameter and its relationship with geodynamic processes.
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