Seiches are oscillations most likely observed in which setting?

• A. Open ocean
• B. Inland lakes
• C. Deep sea trenches
• D. Glaciers

Answer: (B)

Seiches are standing waves that form when a body of water is confined by land boundaries, allowing wave energy to reflect off opposite shores and interfere, creating a back-and-forth oscillation of the surface. Inland lakes are ideal for this because they are enclosed basins where disturbances from wind or earthquakes can set up a coherent reflection pattern and produce measurable oscillations with a period determined by the lake’s size and depth. In the open ocean the energy disperses more readily and coherent standing waves don’t persist as easily, and deep sea trenches are not typical enclosed basins for this effect. Glaciers involve ice rather than a water-filled basin, so seiches aren’t the usual phenomenon there.