Answer:
The correct answer will be they often compare information from all over the world.
Explanation:
A seismograph is an instrument which is used to detect and record the waves produces during an earthquake.
Earthquakes generate a series of seismic waves which travel radiate through the Earth. These waves travel in two forms- P-type or primary waves and S-type or secondary waves.
Geologist uses a simple method for locating an earthquake by finding the time interval between the P- and S-wave arrived at various seismograph stations. the distance between the earthquake point and station is then calculated from travel-time curves and standard travel-time tables. Arcs are drawn on the globe and mark the epicentre. They compare the data with the existing data and recorded data all over the world.
Thus, they often compare information from all over the world is the correct answer.
