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Earthquakes can disrupt shortwave transmissions


 invite response                
2019 Sep 6, 6:33pm   1,233 views  14 comments

by Patrick   ➕follow (55)   💰tip   ignore  

Who knew?

http://www.arrl.org/news/report-california-earthquakes-disrupted-hf-propagation-on-west-coast

Over the holiday weekend, Schwarz had reported “a massive short-wave radio blackout” on the west coast. “It is not caused by the sun (the sun is quiet), but the field lines of the ’quakes themselves,” he said. A magnitude 6.2 earthquake took place off Vancouver Island, British Columbia, on July 4.

On July 6, Schwarz said, the RF Seismograph showed an increase in noise on 80 meters some 13 hours beforehand, as well as some propagation changes on 40 and 30 meters — low before the quake and increasing in its wake. Increases in noise on 15 and 10 meters were detected some 10 hours before the earthquake, diminishing about 3 hours afterward. In addition, noise level and propagation changes on 20 meters some 3 hours before the earthquake.


Maybe this can be used to predict earthquakes.

Comments 1 - 14 of 14        Search these comments

1   HeadSet   2019 Sep 6, 7:16pm  

Maybe this can be used to predict earthquakes.

So you are saying, earthquakes can "broadcast" themselves ahead of time?
2   RC2006   2019 Sep 6, 8:15pm  

That's pretty interesting, going to have to read more on that.
3   Hircus   2019 Sep 6, 8:21pm  

Interesting. Looks like quakes sometimes emit a burst of RF days to weeks before they strike.

I wonder what causes the RF. Or maybe, something causes the EM, which contributes to disruptions below.
4   rocketjoe79   2019 Sep 7, 10:24pm  

I'm surprised they hadn't thought of this before. Submarine comms are on ELF band.
5   RC2006   2019 Sep 8, 7:25am  

If this is real, should be easy to go back years and look at logs to see if there are patterns.
6   HeadSet   2019 Sep 8, 2:55pm  

Hircus says
Interesting. Looks like quakes sometimes emit a burst of RF days to weeks before they strike.

I wonder what causes the RF. Or maybe, something causes the EM, which contributes to disruptions below.


Sounds like Bond villain. Evil "Dr Shake" (Google subsidiary) buys up cheap interior land, then uses his RF earthquake generator to cause coastal land to fall into the sea. Double duty if the machine emits high level concentration of CO2, so seas rise to meet his new coast land.
7   Patrick   2019 Sep 8, 3:01pm  

HeadSet says
So you are saying, earthquakes can "broadcast" themselves ahead of time?


@HeadSet yes, it sounds like earthquakes may broadcast themselves ahead of time:

Patrick says
Increases in noise on 15 and 10 meters were detected some 10 hours before the earthquake, diminishing about 3 hours afterward.
8   HeadSet   2019 Sep 8, 3:33pm  

Yes, Patrick, I was making a play on words, as in Radio Broadcasting. I agree that would be great if radios tuned to the 15 and 10 meter bands could predict quakes 10 hours ahead. But when did we start using bandwidth (15 and 10 meter) instead of frequency (28 MHz) to describe radio transmissions? Sounds geeky.
9   Patrick   2019 Sep 8, 4:09pm  

Maybe the wavelength is more relevant than frequency here and the guy wanted to make that point.

I kinda remember that radio frequency energy is absorbed by physical things about the size of the wavelength. Maybe there are 15 to 10 meter rocks in the earth which are absorbing or producing rf energy before an earthquake.
10   HeadSet   2019 Sep 8, 6:28pm  

I kinda remember that radio frequency energy is absorbed by physical things about the size of the wavelength.

This sounds like antenna theory, as how long an antenna should be to best pull in a specific wavelength. But we are talking metal here, I do not think rocks work this way.

Maybe there are 15 to 10 meter rocks in the earth which are absorbing or producing rf energy before an earthquake.

If that were true, would not all wavelengths be affected, not just 10-15 meters? After all rocks come in all sizes, not just 10-15 meters.
11   RC2006   2019 Sep 8, 8:36pm  

HeadSet says
But when did we start using bandwidth (15 and 10 meter) instead of frequency (28 MHz) to describe radio transmissions? Sounds geeky.


I think because it was on arrl that's ham radios guys and they like to talk in meter than saying 10 meter instead 28.000 to 29.700 MHz.
12   Patrick   2019 Sep 8, 8:40pm  

That makes sense.
13   RC2006   2019 Sep 8, 8:41pm  

Could be all sorts of things if true, I use to run little relay at high speed to cause shittons of noise on ham radio guys station. Maybe large sections of earth with iron mixed in rubbing causes it, could be all sorts of things.
14   just_passing_through   2019 Sep 8, 8:56pm  

HeadSet says
Sounds like Bond villain. Evil "Dr Shake"


That's who down voted this thread.

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