Fig. 4.

Horizontal propagation distance (colorscale in degrees) and direction (arrows) covered by the IGW from the generation at the sea level to the altitude of 250 km at the main period of 14 min (left) and 26 min (right). In essence, the IGW generated at given position at the sea level will be observed at 250 km of altitude after covering a distance shown by the color and in the direction indicated by the arrow. The low bathymetry close to Hawaii reduces the horizontal velocity of the IGW and tsunami (Fig. 1), consequently IGW generated before Hawaii go beyond the IGW generated in the shallow bathymetry region as well as beyond the tsunami. This effect affects more the period at 26 min than 14 min.