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Post by the light works on Jun 18, 2018 13:44:48 GMT
the Soccer news is that fans jumping up and down after a significant goal in Mexico city triggered two earthquake sensors in the city.
wonder how many people they could get to help test this...
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Post by GTCGreg on Jun 18, 2018 15:58:45 GMT
I wonder how close the seismic sensors are to the soccer field.
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Post by the light works on Jun 18, 2018 16:14:31 GMT
I wonder how close the seismic sensors are to the soccer field. definitely a factor. I know it doesn't take many running people to make a building vibrate. |
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Post by mrfatso on Jun 19, 2018 14:13:32 GMT
As the World Cup is taking place in Russia I'd say there was quite some distance between the stadium and the sensors in Mexico City. It would be more like everyone in Mexico City jumping around at the same time rather than a crowd of people in one place.
The story comes from when Mexico recorded a win against Germany.
But from what I understand although sesmic sensors were triggered it did not simulate an earthquake.
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Post by the light works on Jun 19, 2018 15:03:23 GMT
As the World Cup is taking place in Russia I'd say there was quite some distance between the stadium and the sensors in Mexico City. It would be more like everyone in Mexico City jumping around at the same time rather than a crowd of people in one place. The story comes from when Mexico recorded a win against Germany. But from what I understand although sesmic sensors were triggered it did not simulate an earthquake. so, the stadium the game was in was not in mexico? that was a point the news releases I saw did not mention. and yes, the stories all said that while the sensors were triggered, the phenomenon was always considered to be a manmade phenomenon, rather than an actual quake. |
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Post by ironhold on Jun 19, 2018 15:16:01 GMT
Was the venue hosting a live, televised broadcast?
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Post by the light works on Jun 19, 2018 15:32:23 GMT
Was the venue hosting a live, televised broadcast? not sure, none of the stories I saw gave that kind of details. it would be a factor in testing - does organized celebratory jumping cause stronger shock waves than unorganized jumping? addendum: and how little guidance does it take for celebratory jumping to self organize? I don't know enough about chaos theory - is this covered in chaos theory? |
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Post by GTCGreg on Jun 19, 2018 16:00:12 GMT
So it could have been one guy, standing next to the sensor, jumping up and down.
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Post by the light works on Jun 19, 2018 16:09:57 GMT
So it could have been one guy, standing next to the sensor, jumping up and down. maybe so. I don't know much about their sensor system. I wouldn't think they would be that sensitive to "noise" but that would definitely be a thing to test. |
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Post by mrfatso on Jun 19, 2018 19:32:36 GMT
Was the venue hosting a live, televised broadcast? There were large video screens set up in the cities main squares from what I understand it was probably 10s of thousands of people (if the start of the Recent Bond movie set in Mexico is anything to go by) all celebrating in the same place. |
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Post by the light works on Jun 19, 2018 19:48:20 GMT
they dynamics of the situation are interesting to me, and becoming more so as the discussion goes on.
addendum: could this be another breakstep bridge?
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Post by Cybermortis on Jun 19, 2018 20:13:19 GMT
Nope.
Earthquake sensors ARE sensitive enough to detect movement in the Earths crust humans wouldn't notice. They have to be in order to detect the signs of potential quakes.
Labs can detect traffic moving on roads, but are able to work out that is what they are detecting due to its location on the surface.
In this case they just detected the vibrations from a large crowd of people, which is so commonplace other labs don't feel the need to mention it.
Its certainly testable; All you need to do is get permission to get the crowd at a sports game to jump up and down at a set time and check with a local lab(s) to see if they detected it. Heck, you could even test to see if their equipment is sensitive enough to pick up a truck driving along a nearby road.
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Post by the light works on Jun 19, 2018 20:41:01 GMT
Nope. Earthquake sensors ARE sensitive enough to detect movement in the Earths crust humans wouldn't notice. They have to be in order to detect the signs of potential quakes. Labs can detect traffic moving on roads, but are able to work out that is what they are detecting due to its location on the surface. In this case they just detected the vibrations from a large crowd of people, which is so commonplace other labs don't feel the need to mention it. Its certainly testable; All you need to do is get permission to get the crowd at a sports game to jump up and down at a set time and check with a local lab(s) to see if they detected it. Heck, you could even test to see if their equipment is sensitive enough to pick up a truck driving along a nearby road. I was referring to the question of whether there would be a difference from them jumping in unison as opposed to jumping randomly, and how much it would take to induce random jumpers to come into unison. (by which I mean comparing instructing them to jump in unison, and just instructing them to jump and having them come into unison on their own) |
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Post by ponytail61 on Jun 20, 2018 0:38:14 GMT
Nope. Earthquake sensors ARE sensitive enough to detect movement in the Earths crust humans wouldn't notice. They have to be in order to detect the signs of potential quakes. Labs can detect traffic moving on roads, but are able to work out that is what they are detecting due to its location on the surface. In this case they just detected the vibrations from a large crowd of people, which is so commonplace other labs don't feel the need to mention it. Its certainly testable; All you need to do is get permission to get the crowd at a sports game to jump up and down at a set time and check with a local lab(s) to see if they detected it. Heck, you could even test to see if their equipment is sensitive enough to pick up a truck driving along a nearby road. I was referring to the question of whether there would be a difference from them jumping in unison as opposed to jumping randomly, and how much it would take to induce random jumpers to come into unison. (by which I mean comparing instructing them to jump in unison, and just instructing them to jump and having them come into unison on their own) You could test this with a cheer or music and in silence to see if the cadence of the cheer or music induces or affects the the rhythm of the jumping. |
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Post by the light works on Jun 20, 2018 0:45:39 GMT
I was referring to the question of whether there would be a difference from them jumping in unison as opposed to jumping randomly, and how much it would take to induce random jumpers to come into unison. (by which I mean comparing instructing them to jump in unison, and just instructing them to jump and having them come into unison on their own) You could test this with a cheer or music and in silence to see if the cadence of the cheer or music induces or affects the the rhythm of the jumping. I was thinking of music and also just footage of other people also jumping as possible factors. - with the question of if small groups of people in completely separate rooms would sync up with a common TV feed. |
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Post by GTCGreg on Jun 20, 2018 1:28:48 GMT
You could test this with a cheer or music and in silence to see if the cadence of the cheer or music induces or affects the the rhythm of the jumping. I was thinking of music and also just footage of other people also jumping as possible factors. - with the question of if small groups of people in completely separate rooms would sync up with a common TV feed. A number of years ago, I was running sound for concert and the sound board was located in the front of the balcony. There were about 200 teen age kids listening to the concert up there. When the band started to play an energetic number, the kids started jumping up and down in sync with the music. The balcony started to shake so bad that I thought for sure that it would collapse. I was actually considering shutting down the sound and stopping the show but then the number ended. The rest of the concert was slower songs and the jumping never started again. I have no doubt that if the jumping would have continued, there would have been a serious incident. |
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Post by the light works on Jun 20, 2018 1:43:38 GMT
I was thinking of music and also just footage of other people also jumping as possible factors. - with the question of if small groups of people in completely separate rooms would sync up with a common TV feed. A number of years ago, I was running sound for concert and the sound board was located in the front of the balcony. There were about 200 teen age kids listening to the concert up there. When the band started to play an energetic number, the kids started jumping up and down in sync with the music. The balcony started to shake so bad that I thought for sure that it would collapse. I was actually considering shutting down the sound and stopping the show but then the number ended. The rest of the concert was slower songs and the jumping never started again. I have no doubt that if the jumping would have continued, there would have been a serious incident. it has happened in other venues. |
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Post by mrfatso on Jun 20, 2018 6:04:35 GMT
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Post by silverdragon on Jun 29, 2018 8:23:56 GMT
Have done some research.
The most reliable stuff I can find, states that most reliable sensors, are sited well away from sports stadiums, and if you think about say maybe a Big-Foot contest, well, huge truck jumping may set off a seismic sensor at the side of a pitch?.
So the pones set to sense earthquakes are sited well away from human habitation....
Yes a few sensors may have been triggered, but, not enough to trigger a warning, especially when factoring in the ignore feature on stadiums where the crowds may have gathered to watch on Big Screens etc?.
So "Could you"? well, yes quite easily, but in real life, "Would you?" well, no, because you would have to have a big crowd near a sensor, which as I just said, are purposely sited away from Public Interference?.
So possible myth busted that this event DIDN'T set off earthquake sensors, because those who watch them, said no it didnt?.
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Post by the light works on Jun 29, 2018 14:45:06 GMT
Have done some research. The most reliable stuff I can find, states that most reliable sensors, are sited well away from sports stadiums, and if you think about say maybe a Big-Foot contest, well, huge truck jumping may set off a seismic sensor at the side of a pitch?. So the pones set to sense earthquakes are sited well away from human habitation.... Yes a few sensors may have been triggered, but, not enough to trigger a warning, especially when factoring in the ignore feature on stadiums where the crowds may have gathered to watch on Big Screens etc?. So "Could you"? well, yes quite easily, but in real life, "Would you?" well, no, because you would have to have a big crowd near a sensor, which as I just said, are purposely sited away from Public Interference?. So possible myth busted that this event DIDN'T set off earthquake sensors, because those who watch them, said no it didnt?. semantics alert: the news report was that the sensors did register, but it was reported as a manmade event. I'm interested in this from a science standpoint - as in how much DO we effect our environment when we do things like that? |
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