GEOLOGY

Detailed explanation-1: -Seismographs are instruments used to record the motion of the ground during an earthquake. They are installed in the ground throughout the world and operated as part of a seismographic network. The earliest “seismoscope” was invented by the Chinese philosopher Chang Heng in A.D. 132.

Detailed explanation-2: -Seismographs. During an earthquake, vibrations caused by the breakage of rock along a fault zone radiate outward from the point of rupture. The instrument used to record and measure these vibrations is called a seismograph.

Detailed explanation-3: -A seismograph is a machine which measures an earthquake.

Detailed explanation-4: -A seismograph is an instrument that measures and registers seismic waves that travel through the Earth as the outcome of an earthquake.

Detailed explanation-5: -When there is an earthquake, everything in the seismograph moves with the Earth except the weight with the pen on it. As the drum and paper shake next to the pen, the pen makes squiggly lines on the paper, creating a record of the earthquake. This record made by the seismograph is called a seismogram.