Question

What is the underlying principle of seismograph construction?

Answer 1

Weights, vibrating rod, pendulum : sensitive to vibrations.

Step-by-step explanation:

Seismograph is an instrument used to measure earthquakes by recording seismic waves. It provides us all details about earthquake - centre, time, depth, energy.

The device is sensitive to vibrations. It consists of a vibrating rod connected to a pendulum, that vibrates due to earthquake shaking. The weight is also complementary attached with rotating drum & pen, to record ground motion. The seismograph output is then recorded & processed on paper.

Answer 2

A heavyweight suspended within a moving box needs to overcome inertia which leads to a slight delay in the motion of the weight as the box moves.

Step-by-step explanation:

A seismograph is an instrument used to record earthquake waves

A heavyweight suspended within a moving box needs to overcome inertia which leads to a slight delay in the motion of the weight as the box moves.

The first earthquake waves arrive at a seismograph station, a short time after the earthquake occurs.