A tsunami can technically happen anywhere where a strong earthquake occurs for example one of the strongest tsunamis to date occurred in modern day Alaska, however when you think tsunami surely you wouldn’t think Alaska right? Now in terms of modern deadly and potent tsunamis then the 2 that come to mind would be the deadly 2004 Indian Ocean tsunami that sadly took the lives of about 200,000 people and the 2nd would be the destructive 2011 Japanese tsunami that while it only killed 15,000 as compared to its Indian counterpart it, however caused 20x more damage because while the 2004 Indian Ocean tsunami was indeed deadly it only caused 13 billion dollars worth of damage while the 2011 Japanese tsunami caused 300 billion dollars in damage.