(All shook up.).  Usually happen near faults. (What are faults?)  Many faults are near plate boundaries, but they can be anywhere and everywhere.

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Presentation transcript:

(All shook up.)

 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.

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

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

 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!!

By far the most destructive of all

 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)