teletsunami ( also called an ocean-wide tsunami , distant tsunami , distant-source tsunami , far-field tsunami , or trans-ocean tsunami ) is a tsunami that originates from a distant source , defined as more than away or three hours ' travel from the area of interest , sometimes travelling across an ocean . All teletsunamis have been generated by major earthquakes such as the 1755 Lisbon earthquake , 1960 Valdivia earthquake , 1964 Alaska earthquake , and 2004 Indian Ocean earthquake
1960 Valdivia earthquake
1960 Valdivia earthquake
Teletsunami