Which mechanism causes enhanced tsunami amplitude when seismic waves shoal the coast?

💡 Explanation

When seismic waves approach the coast, reduced water depth causes decreased group velocity, concentrating wave energy into a smaller volume, amplifying the wave height. Therefore amplitude increases result, not frequency shifts, interference, or resonance which require different conditions and wave interactions.

• Which topographic feature increases following post-glacial isostatic rebound near a cirque basin?
• Which mechanism causes 'staircase' valley features when glacial cirques truncate a pre-existing stream valley?
• Which process consistently rebuilds sand eroded around coastal stacks?
• Which process drives the uplift that generates fault block mountains?
• Which mechanism creates an accretionary wedge when an oceanic plate subducts beneath a continental plate?
• Which outcome results when decreased wind strength reduces upwelling within an ocean gyre system bordering a desert?