Measuring Earthquakes

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Measuring Earthquakes Cornell Notes page 127

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

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

An alternative seismic instrument…

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.

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

Scale II Felt indoors by few

Scale IV Felt indoors by many, outdoors by few

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

Scale VIII Fright general - alarm approaches panic.

Scale XII Damage total - practically all buildings damaged greatly http://www.abag.ca.gov/bayarea/eqmaps/doc/mmi.html