Tonga volcano pressure wave

The underwater volcanic eruption near Tonga, along with a tsunami, sent shockwaves around the world.

The eruption at 0410 GMT was felt in Wanstead some 15 hours later. By my calculation the blast some 10,304 miles distant would have travelled around 687 mph, slower than the speed of sound which is 767 mph.

The plot can be seen below.

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