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**Measuring Earthquakes**

Cornell Notes page 127

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**What is seismology? The study of earthquakes**

An entire branch of science is devoted to understanding earthquakes

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**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

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**An alternative seismic instrument…**

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**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.

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**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

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Scale II Felt indoors by few

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Scale IV Felt indoors by many, outdoors by few

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

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Scale VIII Fright general - alarm approaches panic.

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**Scale XII Damage total - practically all buildings damaged greatly**

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