# GEOLOGY

## EARTH SCIENCE

### EARTHQUAKES

 Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Which statement describes how geologists use data from seismographs to learn about earthquakes?
 A They often compare information from all over the world. B They map the location of an earthquakeâ€™s focus.. C They use one reading to determine the location of an epicenter. D They measure the difference between the arrival times of surface waves
Explanation:

Detailed explanation-1: -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.

Detailed explanation-2: -By looking at the seismograms from different recording stations, we can find out the epicentre of the earthquake. The signals arrive first at the closest station and last at the one furthest away. The time difference between the P-and S-waves tells us the distance the earthquake is from the seismometer.

Detailed explanation-3: -Which statement describes how geologists use data from seismographs to learn about earthquakes? They often compare information from all over the world.

Detailed explanation-4: -By studying the seismogram, the seismologist can tell how far away the earthquake was and how strong it was.

Detailed explanation-5: -Finding the Distance to the Epicenter Use the time difference between the arrival of the P and S waves to estimate the distance from the earthquake to the station. (From Bolt, 1978.) Measure the distance between the first P wave and the first S wave. In this case, the first P and S waves are 24 seconds apart.

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