maakusan
Indiscriminate fun!!! on Flickr.Indiscriminate fun!!!

Indiscriminate fun!!! on Flickr.

Indiscriminate fun!!!

Parade of the brewers to Grand Place on Flickr.Parade of the brewers to Grand Place

Parade of the brewers to Grand Place on Flickr.

Parade of the brewers to Grand Place

Late in the evening on Flickr.Late in the evening

Late in the evening on Flickr.

Late in the evening

smartereveryday:

Wow… and actual volcano explosion shock wave.  Insane.  Hey!  We can do math on this!

The explosion happens at 0:12 seconds in, and the shock wave hits at 0:25 seconds.  13 seconds for the shock wave to hit the boat.

The speed of sound at sea level is 331.5 m/s (741.5 mph)

Velocity = Distance / Time

Therefore

Distance = Velocity x Time

Distance = 331.5 m/s x 13 seconds: = 4,309.5 meters

Ok.. so now we know the distance to the volcano… we can assume:

Density of the air at sea level = 1.224 kg/m^3

Speed of sound = 331.5 m/s as above

r = 4,309.5 meters from math….

If we had a calibrated microphone on the camera we could use the following equation from the paper "Generation and propagation of infrasonic airwaves from volcanic explosions"  to calculate the pressure in the volcano at the moment of explosion.

Acoustic Energy Equation

My raw notes for posterity.

The band still going full  8 hours later!! on Flickr.The band still going full  8 hours later!!

The band still going full 8 hours later!! on Flickr.

The band still going full 8 hours later!!

The band still going full  8 hours later!! on Flickr.The band still going full  8 hours later!!

The band still going full 8 hours later!! on Flickr.

The band still going full 8 hours later!!

This is not an advert for Novotel on Flickr.This is not an advert for Novotel

This is not an advert for Novotel on Flickr.

This is not an advert for Novotel

All hail the ale! on Flickr.All hail the ale!

All hail the ale! on Flickr.

All hail the ale!

Sightseeing during Brussels Beer Weekend on Flickr.Sightseeing during Brussels Beer Weekend

Sightseeing during Brussels Beer Weekend on Flickr.

Sightseeing during Brussels Beer Weekend

The blessing of St Arnold on Flickr.The blessing of St Arnold

The blessing of St Arnold on Flickr.

The blessing of St Arnold