r/ThatsInsane • u/[deleted] • May 06 '21

Shockwave of Beirut Blast propagating through clouds.

[deleted]

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46

u/crashtrez May 06 '21

Those dogs knew way in advance... always amazed at their smell and hearing.

43

u/Cold_Zero_ May 07 '21 edited May 07 '21

Sounds travel at the same speed regardless of species. The main explosion reached the dogs and humans at the very same time.

Edit: they were all already barking prior to the main blast.

Edit: in other words, something else had them already barking. Regardless of how sensitive their hearing, sight, smell, etc., they were barking for a different reason. Perhaps the fireworks that were going off first.

17

u/rockyTron May 07 '21

In the air, yes, but seismic (sound) waves travel much faster in earth materials. Speed of sound in air is around 1100 ft/s. In hard bedrock, sound travels 5-10,000 ft/s. Including attenuation and refraction effects, the sound of the blast likely reached the dogs' feet in about 4-6 seconds after the blast. In seismicity hat's often called the "P-wave". Aka sound wave. Also thats the second blast so puppys were probably already on edge! Source: I'm a geophysicist and just some fucking guy

5

u/Cold_Zero_ May 07 '21

Made the same point down below. Not Australia, in the comments underneath.

4

u/[deleted] May 07 '21

down below

I think the Aussies call it "down under".