Date post: | 12-Jul-2015 |
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Technology |
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EARTHQUAKES
IN THE MIDWEST
Slideshow to Accompany NOVA scienceNOW Episode Aired 09.01.09 http://www.pbs.org/wgbh/nova/earth/earthquakes-midwest.html
The earth’s crust is made up of pieces called plates. When the plates move, they rub against each other. This causes the ground to shake.
THE EARTH IS LIKE A PUZZLE
Illinois is near the center of the United States. It is not near a plate boundary, yet it still gets earthquakes.
ILLINOIS
California is on the western edge of the United States. It lies along the North American plate boundary.
CALIFORNIA
Seismologists are Earth scientists who study earthquake and their energy waves.
They use seismometers to measure ground motion. The larger the line recorded, the more energy in the wave.
WHAT IS A
SEISMOGIST?
NEW MADRID MARKER
HOW DO YOU STUDY A 200 YEAR OLD EARTHQUAKE?
Scientists look for clues the earthquake left behind. The light patches in this aerial photo show old sand blows caused by earthquakes.
STALAGMITE
RINGS
OTHER EVIDENCE: SAND BLOWS
Why do you think geologists look at both stalagmitesand blow evidence? Isn’t one type of evidence good enough?
Geologists estimate the hazard of the New Madrid Seismic Zone is as high as California and Alaska.
U.S. EARTHQUAKE HAZARD MAP
The New Madrid Seismic Zone has several faults hidden beneath 100- to 200- foot thick layers of soft river soils.
UNDERGROUND
FAULTS
THE MIGHTY
MISSISSIPPI
The Mississippi Riverruns right through the New Madrid Seismic Zone.
Geologists estimate a 25-40% chance a significant New Madrid area earthquake will happen in the next 50 years.
WHEN IS THE NEXT BIG NEW MADRID
EARTHQUAKE?
PREDICTION OF
DAMAGE FROM A
LARGE NEW
MADRID
EARTHQUAKE
Check out these earthquake websites!
United States Geological Service Education Links http://earthquake.usgs.gov/learn/
Shake, Rattle and Slide
http://urbanext.illinois.edu/earth/
Facts About the New Madrid Seismic Zone http://www.dnr.mo.gov/geology/geosrv/geores/techbulletin1.htm
WANT TO LEARN MORE ABOUT EARTHQUAKES?
See how much you learned today. Click the link below to take the New Madrid Earthquake quiz.
https://qtrial.qualtrics.com/SE/?SID=SV_0fwqla08fgSswGF
NEW MADRID QUIZ