Wave activity will persist for several hours. While the first wave will often be significant, it may or may not be the largest. Even when the first wave is the largest, waves of similar magnitude may in some cases arrive more than 6-8 hours after the earthquake.
The waveforms shown above correspond to positions at about 5m of depth, near the identified towns or estuaries, for Scenario 4. Waveforms at positions relatively close to those shown may exhibit rather distinctive behavior. Also, different scenarios lead to distinctive behavior at fixed positions. The marked variability of tsunami waves with space, time, and excitation characteristics will constitute a major challenge for coastal planners.