Earthquakes

What is an earthquake?  

It is the sudden movement of the earth's crust caused by the stress accumulated along geologic faults or by volcanic activity.

How do earthquakes happen?

They happen when rocks or plates inside the Earth swiftly shift or break due to stress, which issues rippling shock waves.

Are all earthquakes dangerous?

No, they can be varied from very weak where you don't even feel them or super strong where millions of people are killed and cities are annihilated.

What can earthquakes do?

1. Demolish Cities                        

2. Start Volcanic Eruptions

3. Cause Landslides

4. Cause Huge Sea Waves

5. Puncture Dams

How are earthquakes measured?

They are measured by an instrument called a seismograph, which records seismograms. In a seismogram, earthquakes are located by the time  that passes between the S and P waves. The fastest waves that travel through the Earth and arrive at the seismograph first are the P waves, also known as "Primary Waves", while the waves that come second are S waves, also known as "Secondary Waves." When the seismogram picks up the earthquake, scientists analyze the time difference between the two waves to see how far away the earthquake is. To be able to exactly locate an earthquake, you would have to use three seismographs. If you have one seismograph, you can only guess how far away it is. When you measure the time difference between the S and P waves at three different stations, you draw circles around that station and the place where they meet is where the earthquake is located.

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