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The magnitude 7.8 ShakeOut quake would be more than 12 times bigger than the Northridge quake as measured on a seismogram.

He added: "The seismogram signals from each event are almost identical to each other."

Whereas the seismogram from the Beast Quake clearly measured the ground shaking from an enthusiastic fan base over a 60-second period, seismologists say concerts are a little trickier.

Gravitational signals show up on seismometers before the arrival of the first seismic waves, in a portion of the seismogram that’s traditionally ignored.

He said that Trump had two: one that resembles “a seismogram reading after an earthquake,” and another that is more legible.