Changes

==Origin==

==Origin==

Japanese, from ''tsu'' harbor + ''nami'' [[wave]]

Japanese, from ''tsu'' harbor + ''nami'' [[wave]]

*[http://en.wikipedia.org/wiki/19th_century 1897]

*[https://en.wikipedia.org/wiki/19th_century 1897]

==Definitions==

==Definitions==

*1:  a great sea wave produced especially by submarine earth movement or volcanic [[eruption]]

*1:  a great sea wave produced especially by submarine earth movement or volcanic [[eruption]]

The Greek historian [https://en.wikipedia.org/wiki/Thucydides Thucydides] suggested in his late-5th century BC ''[https://en.wikipedia.org/wiki/History_of_the_Peloponnesian_War History of the Peloponnesian War]'', that tsunamis were related to submarine earthquakes, but the [[understanding]] of a tsunami's nature remained slim until the 20th century and much remains unknown. Major areas of current research include trying to determine why some large earthquakes do not generate tsunamis while other smaller ones do; trying to accurately forecast the passage of tsunamis across the oceans; and also to forecast how tsunami waves interact with specific shorelines.

The Greek historian [https://en.wikipedia.org/wiki/Thucydides Thucydides] suggested in his late-5th century BC ''[https://en.wikipedia.org/wiki/History_of_the_Peloponnesian_War History of the Peloponnesian War]'', that tsunamis were related to submarine earthquakes, but the [[understanding]] of a tsunami's nature remained slim until the 20th century and much remains unknown. Major areas of current research include trying to determine why some large earthquakes do not generate tsunamis while other smaller ones do; trying to accurately forecast the passage of tsunamis across the oceans; and also to forecast how tsunami waves interact with specific shorelines.