# Earthquakes Essay

715 Words Sep 28th, 2012 3 Pages
Earthquakes xxxxx SCI245
September 18, 2011

There are four types of tectonic plate margins, the meeting place of one plate with another. The four plates are destructive, constructive, collision, and conservative. Plates are constantly moving or changing position. The divergent boundaries are where new crust is generated as the plates pull away from each other. The convergent boundaries are where the crust is destroyed as one plate drives under another. The Transform boundaries are where the crust is neither produced nor destroyed as the plates slide horizontally past each other. And the Plate boundary zones are the broad belts in which boundaries are not well defined and the effects of plate interaction are unclear. They
This happens frequently and with different magnitudes. This causes a tremendous amount of force being released that spreads in all directions underneath the earth’s crust. This is similar to throwing a rock in water. The rock makes ripples when it hits the water; the biggest ripple is in the middle. With an earthquake, it is huge in the middle then diminishes as it moves outward from the epicenter. The events that cause the earth to quake and shake are when the tectonic plates move. The more violent the tectonic plates move or quicker they move, the larger the earthquake is. The Richter scale is used to measure earthquakes. The Richter scale measures the earthquake’s magnitude. The magnitude is calculated from the amplitude of the largest seismic wave recorded for the earthquake. The magnitudes are based on a logarithmic scale, base 10. Meaning an earthquake that is 4 on the Richter scale is actually 10 times more powerful than one that is a three. To put this in perspective, an earthquake that is one on the Richter scale releases as much energy as blowing up six ounces of TNT. An earthquake that is an 8 on the Richter scale releases as much energy as blowing up 6 million tons of TNT. The two types of body waves an earthquake creates are compressional waves known as P waves and shear waves known as S waves. P waves are the fastest and there are the first to be felt. These are generally felt by

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