GEOLOGY

Detailed explanation-1: -A seismogram is a tracing of earthquake motion created by a seismograph.

Detailed explanation-2: -Scientists use an instrument called a seismograph to record data about seismic waves. This information yields information that can help scientists learn not only about earthquake behavior but also about the structure of Earth itself. There are two broad classes of seismic waves: body waves and surface waves.

Detailed explanation-3: -Seismograph is the instrument that records the tremors of an earthquake. This instrument also helps seismologists to map the interior of the Earth.

Detailed explanation-4: -To overcome this problem, modern seismograph stations have three separate instruments to record horizontal waves-(1) one to record the north-south waves, (2) another to record east-west waves, and (3) a vertical one in which a weight resting on a spring tends to stand still and record vertical ground motions.