1. Measuring Earthquakes
Cornell Notes page 127

2. What is seismology? The study of earthquakes
An entire branch of science is devoted to understanding earthquakes

3. What do we use to measure earthquakes?
Seismograph
an instrument that measures vibrations in the ground, and records the location and strength of an earthquake

4. An alternative seismic instrument…

5. What is the Richter Scale?
Measures the magnitude or strength of the shock waves.
Is measured in steps from one upward.
Each successive unit is ten times more powerful than the one before.
A 7.0 on the Richter scale is 1000 times more powerful than an earthquake measuring 4.0.

6. What is the Mercalli Intensity Scale?
Measures what is felt by people and the amount of damage caused
Uses roman numerals
Scale: I- not felt to XII- total destruction

7. Scale II
Felt indoors by few

8. Scale IV
Felt indoors by many, outdoors by few

9. Scale VI
Felt by all, indoors and outdoors. Moved furniture

10. Scale VIII
Fright general - alarm approaches panic.

11. Scale XII Damage total - practically all buildings damaged greatly