Earthquakes.

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Presentation transcript:

Earthquakes

Deformation The process of when a rock changes because of stress Compression-rocks push together (squeezing) Tension-rocks pull away from each other (stretching) Rock layers bend when stress is placed on them. But when the stress is placed on rocks, they can reach their elastic limit and break

Compression- Plates push together Tension- Plates pull apart

Folding Bends in rock that are the result of heat and pressure Occur when the pressure is not great enough to break the rock Mountain form when tectonic plates collide

Fault- A break in rock that is due to stress Three Types of Faults http://www.iris.edu/gifs/animations/faults.htm Normal Reverse Strike-Slip When rocks are pulled apart When rocks are pushed together When rocks are moved horizontally

Seismology The study of earthquakes Seismologist-a scientist who studies earthquakes Seismograph- used to record vibrations in earth and determine the strength of an earthquake Seismogram- a tracing of earthquake motion Earthquake-a sudden, violent shaking of the Earth caused by a shifting of the Earth’s crust

Seismic Waves- a wave of energy that travels through the earth (also called Body Waves) P Waves S Waves Pressure/Primary Waves Fastest waves Travel through liquid, solid or gas Move rock back and forth which squeezes and stretches the rock Shear/Secondary Waves Second fastest Travel through solids Shear rock side to side as they travel through the rock http://www.classzone.com/books/earth_science/terc/content/visualizations/es1002/es1002page01.cfm

Surface Waves Move along the earth’s surface Travel more slowly and are more destructive Move the ground much like ocean waves move water particles

Epicenter- the point on the earth’s surface directly above an earthquakes starting point Focus-the point inside the Earth where an earthquake begins Richter Scale- used to measure the strength of earthquakes

Create a circle map about Earthquakes Earthquake Causes http://www.youtube.com/watch?v=P53OJd_lxew Earthquake Destruction http://www.youtube.com/watch?v=CtBXTvtFaCU Study Jams: Earthquakes http://studyjams.scholastic.com/studyjams/jams/science/rocks-minerals-landforms/earthquakes.htm Mr. Parr It’s An Earthquake http://www.youtube.com/watch?v=sA6oZ4YgKCA