Abstract:

Using the Length of the Day from the EOP C04 data provided by the International Earth Rotation and Reference Systems Service (IERS), and the time series data of the earthquakes whose magnitudes are 5.0 or more than 5.0 from 1973 to 2008 provided by the National Earthquake Information Center (NEIC), this paper gives an analysis of the Granger causality between the changes of the Earth`s rotation and the global earthquakes. Granger causality tests show that there is indeed a twodirectional causal relationship between the changes of the Earth rotation and the earthquakes: one direction is that the changes of the Earths rotation may trigger the earthquakes, and the other is that the earthquake may induce the changes of the Earth`s rotation. This testing result implies that there probably exists a much complex excitation mechanism between the Earth`s rotation and the earthquakes.

Key words:

Earth rotation; earthquake; Granger causality