Question

Which statements describe a seismograph? Check all that apply.

It has a curved graphing surface.
It is used to locate an earthquake’s epicenter.
It uses a needle on graph paper to measure seismic wave activity.
It determines the arrival time of P waves.
It measures data used to find the difference between the arrival times of surface waves.

Answer 1

Explanation :

Seismograph is an instrument which is used to record earthquake at any location.

It has many uses. Some of them are as follows :

(i) It is used to locate an earthquake’s epicenter.

(ii) It uses a needle on graph paper to measure seismic wave activity.

(iii) It measures data used to find the difference between the arrival times of surface waves.

So, the correct options are (b), (c) and (d).

Answer 2

It is used to locate an earthquake’s epicenter.

It uses a needle on graph paper to measure seismic wave activity.

It measures data used to find the difference between the arrival times of surface waves.