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The aim of this work is to study gravitational anomalies that have arisen in the region of the sources of strong underwater earthquakes with a magnitude of M w  &gt; 8. For this purpose, data obtained by the GRACE space system were used. Variations of the  EWH  program with a period of 30 days were investigated relative to the focal area of the 2011 Japanese earthquake for the period 2010-2012. It was found that during the preparation of an earthquake, the  EWH  values significantly increase in this area for three months, with aftershock activity, the  EWH  values decrease within a month. Maps of variations of the  EWH  parameter in the conditions of a disturbed geomedia and in background seismic conditions are constructed. The indices of the anomaly δ EWH  were calculated, which made it possible to analyze in more detail the local gravitational field for the investigated focal zone.

Refinement of parameters gravitational anomaly relative to the focal zone of the 2011 earthquake (Japan) based on satellite data