k(x) = −(γ + ∇f)
Tsunami hazard sign at Bamfield, British Columbia
A tsunami warning sign in Kamakura, Japan
The monument to the victims of the 1946 tsunami at Laupahoehoe, Hawaii
Tsunami memorial in Kanyakumari beach
A Tsunami hazard sign (Spanish - English) in Iquique, Chile.
Tsunami Evacuation Route signage along U.S. Route 101, in Washington