Geography

 A good animation showing the earthquakes and tsunamis from 1901 to 2020.

The earthquake hypocenters (Focus) first appear as flashes then remain as colored circles before shrinking with time so as not to obscure subsequent earthquakes. The size of each circle represents the earthquake's magnitude while the color represents its depth within the earth. This animation also highlights significant tsunamis generated by some of these earthquakes. 

8.8 – Ecuador-Columbia – 31 January 1906 

8.5 – Atacama, Chile 11 November 1922 

8.4 – Kamchatka, Russia – 3 February 1923 

8.4 – Sanriku, Japan - 2 March 1933 

8.6 – Unimak Island, Aleutian Islands 1 April 1946*

9.0 – Kamchatka, Russia 4 November 1952 

8.6 – Andreanof Islands, Aleutian Islands 9 March 1957

9.5 – Valdivia, Chile – 22 May 1960* 

9.2 - Prince William Sound, Alaska – 28 March 1964*

 8.7 – Rat Islands, Aleutian Islands – 4 February 1965 

7.7 – Kalapana, Hawaii 29 November 1975* 

8.4 – Southern Peru 23 June 2001

9.1 – Sumatra, Indonesia – 26 December 2004* 

8.1 – Samoan Islands – 29 September 2009* 

8.8 – Maule, Chile – 27 February 2010* 

9.0 – Tohoku, Japan – 11 March 2011*

7.9 – Haida Gwaii, Canada 28 October 2012

Majority of all earthquakes occur at plate boundaries and tsunami-causing earthquakes mostly occur at convergent plate boundaries where the subduction zones are.

Note most of the earthquake are shallow. Why does earthquake with shallow focus have higher intensity?

Where are the areas prone to earthquakes?

How are subduction zones formed?

What caused earthquakes to form at plate boundaries?

Why are earthquake and tsunamis hazardous?

How can the damage from earthquakes and tsunamis be mitigated?

*tsunamis