Haven't seen this posted so.
TNT EXPOLISION ON RICHTER SCALE
1 ton of TNT. = 2.0 on the Richter scale
4.6 tons of TNT= 2.5 on Richter scale
29 tons of TNT = 3.0 on Richter scale
73 tons of TNT = 3.5 on Richter scale
452 tons of TNT =4.0 Richter Scale
2,806 tons TNT = 4.5 Richter Scale
17,397 tons of TNT = 5.0 Richter Scale
107,862 tons of TNT= 5.5 on Richter Scale
This should put several of the recent underground explosions in context of earthquakes.
ATTN BAKER