I think this would be Seismograms.
A Seismograph
Siesmic waves are the propogation through the ground of any energy, such as sound waves or impact forces.
Siesmic
siesmic waves are sent and an earthquake happens.
They are measured on the Richter scale.
Primary Wave (P wave)
a siesmic wave is a wave that travels through the earth. there are two MAIN types, P and S waves. a siesmograph shows the type of wave and how far away it is from that point.
The correct spelling is "seismic" (creating or concerning ground vibrations).
Seismic refers to activities or phenomena related to earthquakes and the propagation of waves through the Earth caused by sudden movements within the Earth's crust. It includes studies of earthquakes, seismic waves, and the behavior of Earth's structure in response to these vibrations.
Transverse, longitudinal, love, and Rayleigh - just to name a few (there's more than three...)
Volcanic eruptions, siesmic wave patterns, plate tectonics activities.
I dont know about newer ones but older ones had a pen hovering a piece of paper and the siesmic waves would make them move.