The supermodel, 37, and rocker, 42, have been cruising round the Mediterranean isle in the 109ft Lionchase, on loan from Topshop tycoon Sir Philip Green, on their two-week romantic break.
The five-second shockwave was the strongest to hit the region since 1963.
“People on the shore were alarmed, but Kate and Jamie’s boat has been rocking all week so they may not even have noticed,” the Sun quoted an onlooker in the Corsican port of Ajaccio as saying.
“They are clearly having the time of their lives and look totally in love,” the onlooker added.