1.Three major types of stress in rock are tension compression and shearing. Tension affects the Earths crust because it pull it apart,and makes it thinner. Compression pushes rock against each other while, tension pulls them apart.
2. Tension in the Earths crust pulls rock apart forming a fault. Fault occur close to plate bounadries because there, there is a lot of movement forming faults. When plates diverge a reverse fault is formed. When plates pull apart a normal fault is formed.
I think the most epicenters are located near the border of tectonic plates, I believe the closer the earthquake to a tectonic plate the more it will read on the stronger the earthquake will be. The 9.5 earthquake (Richter Scale 0ut of 10) in Chile was really close to the border of to tectonic plates. Also a majority of Earthquakes occur near or in a fault, because the area is weakened.
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