The 'tsunami' is distinguished from wind waves by:
Choose the correct answer
Tsunami is caused by wind like ordinary waves
Seismically generated; very long wavelength (shallow water wave); travels at √(gd) ≈ 700 km/h; arrives as series of waves
Tsunami is only tidal in origin
No difference from storm waves in deep water
Correct Answer
B. Seismically generated; very long wavelength (shallow water wave); travels at √(gd) ≈ 700 km/h; arrives as series of waves
Why is this the answer?
Tsunami: seismically generated ocean wave (earthquake, submarine landslide, volcanic). Very long wavelength (100–600 km → shallow water wave everywhere L >> 10d); very long period (10 min to 2 hours); speed C = √(gd) — 700 km/h in deep ocean. In open ocean: amplitude 0.3–1 m (undetectable). Near shore: shoaling amplifies height to 10–30 m. Run-up: penetrates inland. Warning: DART buoy + seismic monitoring.
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