1. (All shook up.)

3.  Usually happen near faults. (What are faults?)  Many faults are near plate boundaries, but they can be anywhere and everywhere.  Over one million earthquakes per year (one every thirty seconds).  Most are too small to be felt.  But, there are several hundred powerful, damaging ones per year.

7. P-WavesS-WavesL-Waves (aka Surface Waves)

9.  Measures the magnitude (amount of energy released).  0-10 scale.  Devised by Charles Richter in 1935.

10.  It goes up exponentially.  Going up one whole number means a ten times more powerful quake!  So going up two whole numbers means a 100 times more powerful quake!!

13. By far the most destructive of all

14.  Happen at subduction zones.  Since 1900, all six 9.0 or greater quakes.  Can produce tremendous tsunamis (ex. Southeast Asia in 2004 and Japan in 2011)  The Cascadia Subduction Zone is a very likely spot for a megathrust and a tsunami.  Click on image for short video (0:28)