Can jumping Mexicans cause an earthquake?

William Parcher

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Did Mexico’s Revelry in World Cup Win Over Germany Cause an Earthquake?

New York Times said:
Late Sunday morning, seismic sensors in Mexico City detected what was reported to be a small earthquake. But it was triggered in an “artificial manner,” according to the group monitoring the gauges.

“Possibly because of mass jumping,” said the group, the Institute of Geologic and Atmospheric Investigations in Mexico, which said that at least two of its sensors picked up the activity.

The cause of that mass jumping? Moments before, the Mexican men’s national soccer team had scored a goal against powerhouse Germany in their group-stage match in the World Cup in Moscow...

...While nobody was questioning the degree of happiness experienced by the nation, some experts challenged the claim of seismic activity circulated by the Institute of Geologic and Atmospheric Investigations.

El País, the Spanish newspaper, quoted Arturo Iglesias, an investigator with the Institute of Geophysics at the National Autonomous University of Mexico, saying that an earthquake cannot be induced by “the scattered activity of fans.”

In a blog post on Sunday night, the Institute of Geologic and Atmospheric Investigations appeared to push back at the doubters, clarifying that the event was imperceptible to the general population. This sort of occurrence can be referred to as an “artificial” earthquake, the institute said, “to clearly establish that it is not a geological event.”...


https://mobile.nytimes.com/2018/06/17/world/americas/mexico-soccer-world-cup.html
 
So some of it can be noise rather than just jumping?

Wikipedia said:
It was later determined that crowd activity and noise was so great, specifically during Marshawn Lynch's game-clinching touchdown run, that a nearby Pacific Northwest Seismic Network station registered a small tremor located at Qwest Field.
 
They certainly can't cause earthquakes, but they can cause a reaction on seismometers. Just like explosions and other things.

Hans
 
It's interesting that in Seattle you had the jumpers all in a stadium while in Mexico City they were probably not centralized and instead throughout.
 
Lots of things can cause shaking of the ground that can be detected by seismographs. (They're very sensitive instruments; if there's enough shaking for a person to actually feel, it's already several orders of magnitude greater than its detection thresholds. And from a few yards away from the tracks, you can easily feel the ground shaking from a freight train passing by.) The movement of heavy vehicles, excavation and other construction activities, ground impacts of falling objects, and explosions are all easily registered by nearby seismographs. The simultaneous movement of a lot of people could quite plausibly exert comparable forces on the ground.

Whether those qualify as earthquakes depends on shades of terminology. If any shaking of the ground is an earthquake, then they do. If only shaking caused by the release of strain energy at a geological fault qualifies, then they usually don't.

In any case, I wouldn't use the phrase "triggered an earthquake" or "induced an earthquake" to describe the effects of such ground-shaking events, unless the shaking actually did cause the release of strain energy at a geological fault. No one seems to be saying that happened in the case at hand (or else, the reports would be citing the epicenter and Richter magnitude of the resulting release).
 
It would have been an order of magnitude larger if they had jumping beans in there pockets.
 
It probably also helps that the area south of downtown where the stadiums are built is mostly fill. It was the only area that suffered significant damage in the Nisqually quake in 2001. So in that respect it's similar to Mexico City, it turns into a bowl of jelly in a quake.
 
They certainly can't cause earthquakes, but they can cause a reaction on seismometers. Just like explosions and other things.
There's an exhibit at the Griffith Park Observatory in Los Angeles (or used to be) with 3 seismometers side by side. One registers deep earthquakes, one detects shallow ones, and one will move if you jump on the floor next to it.
 
... And from a few yards away from the tracks, you can easily feel the ground shaking from a freight train passing by.) ...

"Yards".
It is to laugh. :D

Here next to Coos Bay, Or. the lumber trains, three blocks away, bounce... yes, bounce... my 18,000 lb RV. :D

Even regular street traffic on the main drag just this side of the tracks, not just semis, will make the street under me rumble.
I'm thinking the neighborhood street construction is too thin/under-supported... and/or it's the composition of the soil here next to the water.

Either way... it's quite the rollercoaster on occasion. ;)
 
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Oh, someone has to say it:

Q: Can jumping Mexicans cause an earthquake?

A: Depends on where they jump from.

.... OK, I'll get my coat.:boxedin:

Hans
 
"Yards".
It is to laugh. :D

Here next to Coos Bay, Or. the lumber trains, three blocks away, bounce... yes, bounce... my 18,000 lb RV. :D

Even regular street traffic on the main drag just this side of the tracks, not just semis, will make the street under me rumble.
I'm thinking the neighborhood street construction is too thin/under-supported... and/or it's the composition of the soil here next to the water.

Either way... it's quite the rollercoaster on occasion. ;)

I've noticed this on islands built on fill dirt. A city bus causes heavy vibration all the way up to the roof. Unnerving.

BTW, OP: title should have been 'Causing an Earthquake while Mexican'. It's still a thing
 

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