Question

Tsunamis are generated in coastal areas ans give

Answer 1

Tsunamis that strike coastal locations in the Pacific Ocean Basin are most always caused by earthquakes. These earthquakes might occur far away or near where you live. ... All low lying coastal areas can be struck by tsunami

Answer 2

because tsunami occurs in seas so firstly when tsunami come into existence it mostly affects the areas (coastal areas) which are settled near seas....
BUT if the tsunami is so large , it can also affect the areas which are too far from coastal areas...
eg, Tsunami in year 2000 in orissa ...