What does the oscilloscope measure in the movie the core?

In the movie "The Core," the oscilloscope is used to measure seismic waves and vibrations that indicate disturbances in the Earth's core. It helps the characters analyze the effects of the core's malfunction on the planet's magnetic field and geological stability. The readings from the oscilloscope play a crucial role in understanding the impending global catastrophe and the urgency of their mission to save the Earth.