I did not know about this, and precedes a possible tidal wave. https://twitter.com/Ben_Domensino/status/1482282515616645123
My barometer picked up the atmospheric pressure wave from the Tonga volcano. I had thought it was just a passing CuNim which obscured a good cloud timelapse at that time but using the Tempest map I could look up the coast to see exactly when the max high pressure spike flowed past other stations.
Seen the satellite pictures this explosion was ‘major’ ?? Guess air compression like when a bomb explodes and this waves out in all directions. What is surprising me it is going that far … guess we all can look at our pressure readings and see if it goes really global.
I am guessing it will dampen/weaken until it becomes almost imperceptible. The waves from a “global tsunami” e.g. like the Indian Ocean tsunami of 2004, do travel very far. But, by the time the 2004 tsunami hit the east coast of the US, it was measured in inches rather than feet (or meters ). Our local NWS office had a meteorologist who was doing a tsunami study, and he was pretty excited about it, but, almost nobody outside of the office even noticed .
I would expect the atmospheric perturbations to behave similarly.
at some point in time I might build myself an infrasound detector (0.003 Hz to 20 Hz). Should be capable of measuring the direction from which the super low frequency sound is coming from. Apparently it can detect things like volcanic eruptions thousands kilometers away. Do I have any use for it. No, but I think it might be cool.
but why is it so expensive? is the microbarometer itself that expensive? I didn’t look into this yet. do you know which sensor they are using?
Edit, a 16 bit pressure sensor costs around 11 euro. A couple of those sufficiently spread out, should be a good start.
Infra sound amplitudes are between 0.001 Pa and 100 Pa, compared to the normal atmospheric pressure of 10000 Pa. 16 bit gives a max resolution of 0.15 Pa. So a sensor with more than 16 bit would be great. Or some differential pressure sensor, that could measure the pressure difference between 2 points, in which 16 bit would be perfect.
My barometer just to the west of Poughkeepsie, NY looks like a roller coaster ride today, probably due to the departing coastal storm, incoming arctic blast, and looming winter storm for tomorrow evening…