measuring earthquakes cornell notes page 127. what is seismology? the study of earthquakes an entire...
TRANSCRIPT
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?
• an instrument that measures vibrations in the ground, and records the location and strength of an earthquake
Seismograph
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