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Quakes, long, 1- Longitudinal waves
2- travel through all materials
3-…
Quakes
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quakes around the divergent and transform plates are shallow which means they are the most destructive
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Richter Scale Measures the Magnitude of the quake with a number out of 10
determined by measuring the largest amplitude (wave height)
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First type : Up and Down 
Second type : Side to Side
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Seismograph: Instrument used to measure an Earthquake
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1- Lag time
2- find the correct spot on the curve (distance)
3- draw a circle with the distance as the radius
4- repeat on 3 stations
5- find the intersection between all 3