Post a picture of the Tonga event, measured by your sensors - Page 1
Forum section: electronics / general

author: branadic
author_rank: Super Contributor
timestamp: January 19, 2022, 07:30:18 am
content: Hi,I noticed a lot of articles from people measuring the compression wave created by the vulcano near Tonga.Attached an image what we observed. Who else found this in his data and what sensor did you use?See also:https://www.rainer-gerhards.de/2022/01/druckwelle-des-vulkanausbruch-auf-tonga-im-main-tauber-kreis-messbar/for comparison.-branadic-

author: RoGeorge
author_rank: Super Contributor
timestamp: January 19, 2022, 01:43:09 pm
content: Nice!I didn't know a volcano eruption can be registered as a slow oscillation in the atmospheric pressure all around the Earth.QuoteSource: Google translation ofhttps://www.rainer-gerhards.de/2022/01/druckwelle-des-vulkanausbruch-auf-tonga-im-main-tauber-kreis-messbar/That fragment gave the idea that maybe weather stations should use much faster recording intervals (unless the power budget for the sensors are very, very low, which is usually not the case).Later, the data can be compressed for longer storage, and if lossless compression is not enough, when running out of storage space change the lossless compression into a lossy compression. Since any weather variations are rather slow, the compression ratio is expected to be very good, so the amount of storage space won't increase much, while such unexpected events would be captured with better resolution.

author: Neper
author_rank: Frequent Contributor
timestamp: January 19, 2022, 02:08:26 pm
content: Nothing spectacular but clearly visible:https://the-real-fotoralf.blogspot.com/2022/01/bumm.html

author: FireBird
author_rank: Regular Contributor
timestamp: January 19, 2022, 09:21:46 pm
content: Here’s a picture of the data I’ve captured with a simple Bosch BME680 and a 1 minute sample rate.

author: VK3DRB
author_rank: Super Contributor
timestamp: January 20, 2022, 05:12:35 am
content: Whoever engineered the data pipe from Tonga has no backup plan for critical communications infrastructure. If the Internet went down for a month due to a massive cyber attack by our enemy, there would be chaos because there is no backup to a lot of critical infrastructure.

author: SeanB
author_rank: Super Contributor
timestamp: January 20, 2022, 06:27:25 am
content: Remember that when Krakatoa went off the pressure wave was recorded across the world in London, as pressure waves on recording instruments that were attached to gas supply gasometers. Also on other equipment, but the gasometers were recording that the pressure pulse travelled at least twice across the planet before it dissipated.

author: Ed.Kloonk
author_rank: Super Contributor
timestamp: January 20, 2022, 06:32:30 am
content: Sorry. No data here.Can I offer this?

author: mjs
author_rank: Regular Contributor
timestamp: January 21, 2022, 01:14:08 pm
content: Here's an animation by Lauri Kangas, based on open data from meteorology:https://www.avaruus.fi/fileadmin/avaruus.fi/2022/01/paineaallot_10fps.gifIt shows how the pressure wave coming around the Earth from two different directions!

author: chukin
author_rank: Contributor
timestamp: January 21, 2022, 03:59:31 pm
content: Here's the same data logged not too far away from Austria - about 30km south of Zürich. Shows the direct and indirect pressure pulses pretty well, measured with a Vaisala industrial sensor (not sure of the exact type as I am not at work).The resolution is about 0.1 mbar, sample interval 2 minutes.The company I work for logs air pressure, humidity and temperature continuously - we make pressure and density sensors (amnong other stiff) which need to be corrected for air conditions.