Briefly describe how tsunami are generated and include a description of characteristics such as wavelength and wave speed
Do tsunami behave as shallow-water waves? Why or why not and how does this influence their movement in shallow versus deeper water? What would the shoreline look like when the trough of tsunami arrives?
Tsunami are shallow-water waves generated by sudden changes in the topography of the ocean bottom caused by events such as underwater avalanches, turbidity currents, and fault motion. Tsunami have long wavelengths, typically exceeding 200 km (125 miles) and fast wave speeds (> 700 km or 435 miles/hr). In deeper water, tsunami can typically go unnoticed, but because they travel as shallow-water waves, as they approach shore, their speed decreases, but wave height can increase. As tsunami approach a shoreline, the water level typically decreases (the wave trough), followed by a series of surges and withdrawals of water that are widely separated in time.
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