Lecture 4.2 01/30/2014
Rock deformation p.2
How do earthquakes relate to rock deformation?
How are earthquakes measured?
Why are earthquakes destructive?
Folded rocks move slowly but continuously
Broken rocks move fast which results in earthquakes but are stop and go
Earthquakes: when the stress on faults is greater than strength (slide 61)
Brittle Fractures (slide 63)
The greater the depth (in km) the smaller the amount of earthquakes that occur. 7km depth is where most
frequent amount of earthquakes.
Plastic deformation happens when there is high pressure and high temperatures which is why there are so
few earthquakes at greater depths