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Plot the earthquakes on the map Where do Earthquakes occur?
EW WE N S
An earthquake is any sudden movement of the Earths Crust
Stress is: A force per unit area A force acting on rock to change the shape or volume Graph courtesy of: http://geology.csupomona.edu/dwtarman/alert%20files/structural%20topics/stress.htm
* 3 Types: Result of 2 opposite forces Result of at least 2 opposite forces; may be as many as 4 forces Result of 2 opposite forces
Plastic Deformation Results in folded rock but not earthquakes Elastic Deformation Leads to Earthquakes
* A bend in rock * Does NOT result in earthquakes * Occurs when rock is in plastic state
* Anticline: convex (upward) fold * Syncline: concave (downward) fold Diagrams courtesy of:: http://www.glossary.oilfield.slb.com/Display.cfm?Term=syncline
A SURFACE ALONG WHICH ROCKS BREAK AND SLIDE PAST EACH OTHER * RESULTS IN AN EARTHQUAKE Photos courtesy of: http://pubs.usgs.gov/gip/earthq1/how.html
Once that happens the rock breaks (faults), movement occurs along the fault and energy is released (earthquake). Rocks under pressure will continue to bend and deform until their elastic limit is reached.
Photo courtesy of: http://www.thetech.org/exhibits/online/quakes/faults/cycles1.html
Pressure Changes Excessive Sediment Layers-crack plates Plates undergo vertical movement above bumps in the mantle
Most earthquakes occur at plate boundaries. Transform boundaries experience the most quakes
Deforming the Earth’s Crust
2 pt 3 pt 4 pt 5pt 1 pt 2 pt 3 pt 4 pt 5 pt 1 pt 2pt 3 pt 4pt 5 pt 1pt 2pt 3 pt 4 pt 5 pt 1 pt 2 pt 3 pt 4pt 5 pt 1pt StressFaults Mountain Building Misc.
Unit 4 The Restless Earth Part I Lessons 1, 2, & 3
AIM: Describe the types of stress and the land features (faults,uplift,folds) that result from forces (stress) in the Earth’s crust? OBJ: Given notes.
Earth’s Crust in Motion
Earth's Crust in Motion.
MOVEMENT OF THE EARTH’S CRUST
Science *Stack Test Corrections for collection
Describe how Plate Tectonic forces and earthquakes might be related.
Forces in Earth’s Crust
Crust in Motion Chapter 5, Section 1 Monday, January 25, 2010 Pages
Deforming Earth’s Crust
Inside Earth Chapter 2.1 Pages 54-61
Earthquakes Earthquakes: the shaking and trembling that results from the movement of rock beneath Earth’s surface See simulation below: Terashake.
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