Question

what is seismograph please tell

Answer 1

an instrument that measures and records details of earthquakes, such as force and duration.

Answer 2

The device used to record seismic waves is called sesmiograph. The instrument is simply a iron rod, or a pendulam which starts vibrating when tremor occurs. A pen is attached to the vibrating system. The pen records the seismic waves on a paper which moves under it. By studying these waves, scientist can construct a complete map of earthquake. They can also estimate its power to cause destruction.