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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?
• an instrument that measures vibrations in the ground, and records the location and strength of an earthquake
Seismograph
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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
http://www.abag.ca.gov/bayarea/eqmaps/doc/mmi.html
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