Regular Rumbles
Earthquakes in Last 2 Weeks Real Time Data Legend
Real-time Earthquakes
Measuring Earthquakes
This movie shows an old style seismometer recording an earthquake. As P-waves and S-waves from the earthquake pass by, they are recorded on a seismogram using a pen.
A modern EarthScope seismometer is digital and the size of a gallon paint can. It is usually buried several feet below ground and can record earthquakes from around the world. The seismogram is recorded as a digital computer file.