Can Big Crowds Trigger Earthquakes at Concerts, Games?

Large crowds can shake the ground, but not in the way a real earthquake does. FOX Weather explains that concerts and sporting events can create measurable vibrations from jumping, dancing and cheering. Those signals may be picked up by seismic instruments, especially when thousands of people move together. The result can look dramatic on a graph, even if the tremor is caused by fans, not a fault line. Read more about this...