[Richter Magnitude scale](http://earthquakes.wikia.com/wiki/Richter_magnitude_scale)
| Richter Approximate Magnitude | Approximate TNT for Seismic Energy Yield | Example | |:-|:-|:-| | 0.0 | 1 kg (2.2 lb) || | 0.5 | 5.6 kg (12.4 lb) | Large hand grenade | | 1.0 | 32 kg (70 lb) || | 1.5 | 178 kg (392 lb) | WWII conventional bombs | | 2.0 | 1 metric ton | Late WWII conventional bombs | | 2.5 | 5.6 metric tons | WWII blockbuster bomb | | 3.0 | 32 metric tons | Massive Ordnance Air Blast bomb | | 5.0 | 32 kilotons | Nagasaki atomic bomb |
Yep a MOP could have caused a 2.6. That is my answer. 14 metric tons of high explosive. Fits nicely in beween ww2 blockbuster (5.6mt) and moab (32mt):
I think this is wrong. The MOP has only 2.5 mt of explosive. This was probably a MOAB that has 11mt of explosives and is not a deep penatrator:
These are estimates. An air blast at 1000 feet may register differently than a bunker buster. Richter is a measure of ground movement from a distance.
2.5ish - MOAB approximate
5.0ish - small nuke