For which purpose seismograph is used :

کس مقصد کے لیے سیسموگراف استعمال کیا جاتا ہے

For predicting earthquake

For recording earthquake

For Measuring intensity of earthquake

For locating epicenter of earthquake

A seismograph is an instrument used to detect and record earthquakes.

It consists of a mass attached to a fixed base

During an earthquake, the base moves and the mass does not.