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Earthquakes! Laura Cojocari What are earthquakes? Earthquakes are caused when there is movement between tectonic plates along the fault lines, or cracks in the earth. Along fault lines, these tectonic plates are under pressure and when there is too much pressure, the plates are forced to move, and the energy released creates a violent shake! Here is a picture of the world and where these tectonic plates are located http://images.google.com/imgres?imgurl=http://www.rainbowdolphin.com/dinosaurs/images/gal_tectonic%2520plates.jpg&imgrefurl=http://www.rainbowdolphin.co m/dinosaurs/gallery.shtml&h=412&w=552&sz=152&tbnid=4GlE8izWkpkJ:&tbnh=97&tbnw=130&prev=/images%3Fq%3Dtectonic%2Bplates%26hl%3Den%26lr%3D &oi=imagesr&start=2 What types of faults are there? There are four types of faults Dip-slip faults are where one of the tectonic plates is either pushed up or it drops. If the crust, or plate, moves above the fault line, then its called a normal fault. If the piece of crust moves below the fault line, then it is called a reverse fault. A thrust fault is when the plate dips 45 degrees or less below the fault line Strike-slips faults are when the plates slip past each other, neither plate is forced up or down. Oblique-slip faults have a combination of both dip-slip and strike slip faults. http://earthquake.usgs.gov/image_glossary/fault.html Do you know your Earthquakes? What do you call a fault when the plates slide by each other? Normal Fault Oblique Fault Reverse Fault Strike-Slip Fault This is a picture of the San Andreas Fault. This is also a fault where plates slide by each other. http://images.google.com/imgres?imgurl=http://www.lbl.gov/Science-Articles/Research- Review/Highlights/1998/images/EES_fault_sm.jpg&imgrefurl=http://www.lbl.gov/Science-Articles/Research- Review/Highlights/1998/EES_fault.html&h=310&w=300&sz=30&tbnid=mG44dMtSMSIJ:&tbnh=112&tbnw=108&prev=/images%3Fq%3Dsan%2Bandreas %2Bfault%2Bline%26hl%3Den%26lr%3D&oi=imagesr&start=2 CONGRATULATIONS! Congrats! You are the master of fault lines! OOPS! Want to try again?? Click the arrow to review the information again Biography This mini-lesson was made by Laura Cojocari in EDT 3470. Laura is a Junior at Western Michigan University and is pursuing a degree in Elementary Education and Spanish.