Seismograph is used to measure:
Show answer & explanation
Correct answer: C
Explanation
The correct answer is Option 3 i.e. earthquakes.
A seismograph is used to measure earthquake vibrations and seismic waves. It detects and records the intensity, duration, and frequency of ground movements caused by earthquakes and other seismic activities. The instrument consists of a mass suspended on a spring and a pen or digital sensor that records the relative movement between the mass and the ground on a rotating drum or digital medium. This data helps seismologists analyze earthquakes, their magnitude, and their impact on different regions.