Illudium Q-36 Explosive Space Modulator?

Someone has some fun toys out there. There are fireworks going off all the time now but every so often, there is more of a very large and low   ___CRUMP___   rather than a bang.

Played with explosives in my childhood (still have all ten fingers!) and this is a lot more substantial than any M-80. Lower pitched too so guessing something homemade with black powder or some slow-burning blasting explosive. Came from neither a fireworks stand nor the Tribal lands.

Title? Marvin the Martian of course.