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The pressure wave was recorded around the globe seven times, on barometers. I am actively monitoring my digital pressure sensors on my home weather station and
by acidburnNSA 5y ago
The pressure wave was recorded around the globe seven times, on barometers. I am actively monitoring my digital pressure sensors on my home weather station and have seen the pressure waves from the Tonga blast go by 4 times and counting (2 in each direction). Hoping to see a 5th pass tonight here in Seattle at around 10:55pm. I wrote a little python script to predict the future passes based on the first two very obvious ones. Very fun.
- johnohara 5y agoFun indeed. And interesting. Well done.
- acidburnNSA 5y agoNinja edit: I blogged about it here if you want to see the script, predictions, and measurements: https://partofthething.com/thoughts/measuring-the-tonga-eruption-pressure-wave-with-a-home-weather-station/ https://partofthething.com/thoughts/measuring-the-tonga-erup...
- TimSchumann 5y agoThanks for the writeup! Glad to see you around.
- audiometry 5y agoWouldn't pressure waves travelling in opposite directions interfere with each other?
- potatochup 5y agoOnly if you're exactly on the opposite side of the world I think?
- tehbeard 5y agoIf you were exactly opposite the source in terms of distance traveled by the waves, yes?
- yetihehe 5y agoIf they were opposite waves (One negative wave, one positive wave, emitted from two points opposite on the globe) then yes. But if they are both positive, they just add in place where they meet and then travel away as they did before.
- acidburnNSA 5y agoCorrect, and I saw somewhere on twitter that someone near the antipode did see a huge pressure wave from constructive interference.
- DrBazza 5y agoLooks like a 2mb initial fluctuation - any idea what Krakatoa was, that circled the world (at least) 7 times?
- harywilke 5y agoThe barometers around the world recording the shock wave is one of the coolest things. “Krakatoa: The Day the World Exploded: August 27, 1883” by Simon Winchester went into this point. Also, this write up from 2016 at Nautilus after the Papua New Guinea Volcano eruption. https://nautil.us/issue/38/noise/the-sound-so-loud-that-it-circled-the-earth-four-times https://nautil.us/issue/38/noise/the-sound-so-loud-that-it-c...