What is an earthquake? What causes earthquakes and where do they happen? How are earthquakes recorded and measured? Learn more about 'The Science of Earthquakes' at:
, and the location directly above it on the surface of the earth is called the. These are smaller earthquakes that happen in the same place as the larger earthquake that follows. Scientists can’t tell that an earthquake is a foreshock until the larger earthquake happens. The largest, main earthquake is called thethat follow. These are smaller earthquakes that occur afterwards in the same place as the mainshock.
. The seismograph has a base that sets firmly in the ground, and a heavy weight that hangs free. When an earthquake causes the ground to shake, the base of the seismograph shakes too, but the hanging weight does not. Instead the spring or string that it is hanging from absorbs all the movement. The difference in position between the shaking part of the seismograph and the motionless part is what is recorded.An example of a seismic wave with the P wave and S wave labeled.
P waves are like the lightning, and S waves are like the thunder. The P waves travel faster and shake the ground where you are first. Then the S waves follow and shake the ground also. If you are close to the earthquake, the P and S wave will come one right after the other, but if you are far away, there will be more time between the two.
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