What Causes Earthquakes and What Happens When They Occur?

Learning Set 3.2

What causes Tsunamis? Pg.96

A Tsunami occurs when a moderate to sever earthquake occurs underwater, which displaces the water.

Watch this videohttp://www.youtube.com/watch?v=chbbiSCczB8

An Earthquake in Chile can Affect Hawaii due to tsunami formation

What causes an earthquake? Pg 97-98.

When two plates are moving past each other sometimes the plates get stuck and it builds up energy this is called stress. The more stress the more powerful the earthquakes. Earthquakes often occur along fault lines.

Focus is not JUST what we tell you to do all the time :D Pg. 99

Focus is where the earthquake originates underground

Epicenter is the spot on the surface directly above the focus

Do the BODY WAVE! Pg. 100-101

Body waves travel through the Earth.

There are 2 types P waves and S waves

P waves (primary) are longitudinal and are able to pass through solid, liquid, and gas. They are the FASTEST!

S waves (secondary) are transverse and can only travel through solids. They are slower than P waves.

*Tricks to remember-P comes before S in the alphabet

S waves only go through ‘S’olids and ‘S’ slow

Imagine . . . Which is more dangerous?Pg 102-104 You have a house sitting on the

ground and there is an earthquake.

If it is a Longitudinal wave the house will shake the house back and forth in a side to side motion.

If it is a Transverse wave the house will move up and down vertically.