Stuck Overriding plate Subducting plate (a) Slow distortion (b) Tsunaml starts durlng earthquake Stuck area rúptures, releasing energy In an earthquake (c) Tsunaml waves spread (d) Figure 8.14 Subduction zones and tsunami. (a) Plates may stick together. (b) Seaward edge of the overriding plate is dragged downward. (c) When stuck area ruptures, the overriding plate springs upward starting a tsunami. (d) Tsunami race landward and seward. Source: USGS Circular 1187.

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