1. Earthquakes Standard 3d. Students know why and how earthquakes occur and the scales used to measure their intensity and magnitude.

2. Earthquakes

3. What causes Earthquakes?  Most earthquakes are caused by lithosphere plates moving against each other.  There are 3 types of earthquake faults earthquake faults

4. Vocabulary  Magnitude – is the measure of the amplitude of an earthquakes wave.

5. How Earthquakes are measured Richter Scale  Measures the amplitude of an earthquake’s wave. amplitude  Magnitude depends on amount of energy that is stored.

6. Magnitude  Magnitude scales are logarithmic which means that each increase of one point on the Ricther scale is 10 times increase of wave amplitudewave amplitude  One point increase also means an increase of 30% energy.

7. How Earthquakes are measured Modified Mercalli Scale  Depends on how strong an earthquake felt.  It also is measured by how much damage it did at any given location.