Abstract
The characteristics of earthquake wave motions are discussed using the rotary spectrum which is represented in the plane with Cartesian coordinates of frequency and time axes. At first, the relationships with the time series analysis and the particle motions are explained. The particle motions are expressed with the coefficient which represents the direction of rotary motion and the rotation angle of the ellipse. The coefficient and the rotation angle are determined from the nonstationary cross spectrum which is given by the time series analysis. From the figures of rotary spectrum, the characteristics of the particle motions of the strong ground motions and also the arriving time of the different events (multi-fracture mechanism at the focus) are discussed in this paper.
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