Just to add some clarification here is how much TNT yield it would take to register 5.0 on the Richter scale:
Richter scale equivalent TNT explosions
Richter scale TNT YIELD EQUIV.
1.0 30 lbs
1.5 320 lbs
2.0 1 ton
2.5 4.6 tons
3.0 30 tons
3.5 73 tons
4.0 1000 tons
4.5 5100 tons
5.0 32,000 tons
5.5 80,000 tons
6.0 1 million tons
6.5 5 million tons
7.0 32 million tons
7.5 160 million tons
8.0 1 billion tons
Largest WWII = 5 tons = 2.4
Massive Ordnance Air Blast bomb = 11 tons = 2.7
The Hiroshima atomic bomb = 16,000 tons = 4.7
Largest thermonuclear weapon ever tested = 50 million tons = 7.2
That is cool data. Where did you get it?