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Warm-Up Feb 4 Write What You Know!
Write everything you know about the prompt below for five minutes, try for at least 3-4 complete sentences. What kind of dangers might you face during an earthquake? How can you prepare ahead of time for earthquake safety?
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Chapter 2.2 Earthquakes & Seismic Waves
Quakes & Waves Notes Chapter 2.2 Earthquakes & Seismic Waves
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definition in own words facts pictures
Quakes & Waves Notes (Chapter 2.2 Earthquakes & Seismic Waves) 2/4/2014 Major Key Term definition in own words Key Term definition in own words facts pictures Key Term
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Seismic Waves Review Electromagnetic Waves: carry the energy of the stars and allow us to see what stars and other celestial bodies are made of Sonar Waves: carry the energy of sound and allow us to map the ocean floor Seismic Waves: carry the energy of earthquakes and allow us to see the inner structure of the Earth
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(primary waves) (secondary waves) most destructive
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Earthquakes Focus: area beneath surface where rock under stress breaks, the actual point of the earthquake Epicenter: the spot on the surface directly above the focus
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Tracking Earthquakes P waves (primary) are faster than S waves (secondary) Geologists can use the difference in arrival times to determine distance to an earthquake’s epicenter
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Geologists can tell distance, but not direction, of an earthquake from seismic waves monitored from one location If you monitor the same seismic waves from 3 or more locations, you can triangulate and find the epicenter!
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Measuring Earthquakes
Magnitude: the strength of an earthquake Richter Scale: rating of magnitude based on size of seismic waves There are other scales used by scientists, but Richter is most common
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