Fans at Barcelona's Camp Nou stadium produced 'mini-earthquakes' as they celebrated the goals during their team's incredible Champions League victory on Wednesday.
The seismometer at the Jaume Almera Earth Sciences Institute [ICTJA-CSIC], situated just 500 metres from the Camp Nou, captured small tremors after every one of the six goals Barca scored against Paris Saint-Germain.
Jordi Diaz, a researcher at the institute, told news agency EFE that the mass eruption of the crowd after the goals made the ground shake. The biggest vibrations were equivalent to an earthquake with a magnitude of 1.
"Each of the six goals can be identified by sudden and short-duration increases in the range of the seismic signal," Diaz said. "These range increases are due to the coordinated movement of the public in celebrating the goals.
"The vibration generated is transmitted as a seismic wave, which is what our instrument records."
Barcelona clawed back a 4-0 first-leg deficit to beat PSG in the Champions League round-of-16 clash, a victory which has been described as the greatest comeback in Champions League history. The Catalan giants appeared all-but-doomed with 10 minutes to go, but three goals in the dying stages sealed their progress.
Diaz, who has studied the seismic effects of previous goals at the Camp Nou, says the first, second and third goals produced a level of vibration typical for Barca home games. The fourth goal, he says, barely registered as "people didn't celebrate too much, accepting that qualification was difficult."
However "as the end of the match approached everything changed. At 5-1 you can see that the celebration was bigger. The grand finale arrives with the sixth and final goal. At this moment we see the biggest vibration of this type registered up until now on the ICTJA-CSIC seismometer."
Barca now advance to the quarter-finals of the Champions League, although whether their fans can produce such a seismic performance again remains to be seen.