A magnitude-7.8 earthquake shook Nepal's capital and the densely populated Kathmandu Valley on Saturday, the worst quake in the Himalayan nation in over 80 years.  Approx 10,000 people were killed.

The world's strongest earthquakes since 1900: 

May 22, 1960: A magnitude-9.5 earthquake in southern Chile and ensuing tsunami kill at least 1,716 people. 

March 28, 1964: A magnitude-9.2 quake in Prince William Sound, Alaska, kills 131 people, including 128 from a tsunami. 

Dec. 26, 2004: A magnitude-9.1 quake in Indonesia triggers an Indian Ocean tsunami, killing 230,000 people in a dozen countries.