A seismogram's a graph output by a seismograph. It's a record of the ground motion at a measuring station. The energy measured in a seismogram may result from an earthquake or from some other source, such as an explosion.A recording of earth motion as a function of time's called a seismogram. Historically, seismograms were recorded on paper attached to rotating drums. Some used pens on ordinary paper, while others used light beams to expose photosensitive paper. Today, practically all seismogram… (More on Seismogram)