Boston marathon, 8.0 in Iran, and now one of the largest non-nuclear explosions in modern history. Windows broke up to 5 miles away from the blast.
EDIT:
This explosion registered as a 2.1 magnitude earthquake. A small nuke the size of North Korea's gets around a 4.5.
The blast was heard over 45 miles away.
Oh, and the remnants of the chemicals are scattered throughout the town and are extremely toxic.
/r/toosoon is having the week of its life.