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Detecting Preseismic Signals in GRACE Gravity Solutions: Application to the 2011 Tohoku Mw 9.0 Earthquake

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Summary: Subduction zones megathrust faults are a major cause of the world's largest earthquakes. However, the role of deeper subduction processes in earthquake generation is poorly understood. In this study, the variations of the Earth's gravity gradients derived from GRACE geoid models are analyzed from 2003 to 2014. The analysis reveals a large-amplitude gravity gradient signal north of the epicentral area in the three months prior to the earthquake. The results suggest that these signals are related to mass redistributions within the solid Earth on the continental side of the subduction zone. The study highlights the importance of monitoring the Earth's time-varying gravity field to better understand the seismic cycle and dynamic processes in subduction zones.

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