Ground motion

[1] This can be due to natural events, such as earthquakes and volcanic eruptions, or human activities, such as the detonation of nuclear weapons.

Ground motion is measured using a seismometer, a device that detects and records the movement of the Earth's surface.

The recordings produced by a seismometer are known as seismograms, and they can be used to study the characteristics of the ground motion, such as its duration, amplitude, and frequency.

Recordings from multiple seismometers can be combined to form a detailed model of the ground motion.

Seismographs can also be used to create maps of the ground motion, which can help scientists understand the distribution and intensity of the seismic waves.