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# Earthquakes

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Earthquakes

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### Earthquakes

1. 1. EARTHQUAKE S BY: Real Daisy Flores Michelle Arandia Sophia
2. 2. What is an Earthquake?  Earthquakes are vibrations of the earth.  Shaking of Earth's crust a forceful trembling of the Earth's crust that causes damage to edifices.  They are also called, quake, tremor, temblor.
3. 3. What Causes an Earthquake?  Earthquakes are outcomes of the rapid release of tectonic pressure through the fault line or volcanic activity.  When the earth releases energy in the earth’s crust, it creates seismic waves, which causes an earthquake.  An earthquake is a great shaking of Earth's surface. It is caused by the cracking and shifting of the platesis of rock that make up the planet's layered crust
4. 4. P & S WAVES  There are different kinds of seismic waves, & they all move in different ways. The 2 main kinds of waves are ‘body waves’ and ‘surface waves’.  P & S waves are considered ‘body waves’  Earthquakes create several kinds of seismic waves including P, for "Primary" and S, for "Secondary" waves.  For a better understanding you can visit:this website with visual representations
5. 5. P Waves  A P wave, or compressional wave, is a seismic body wave that shakes the floor back and forth like a coil  P waves are the fastest kind of seismic wave, and therefore, the first to be recorded on a seismograph.  P waves can move through solid rock and fluids,(like water or the liquid layers of the earth). It pushes and pulls the rock it moves through; just like sound waves can push and pull the air
6. 6. S Waves  An S wave, or shear wave, is a seismic body wave that shakes the ground back and forth (perpendicular) to the direction the wave is moving.  The second wave you feel in an earthquake is called an S wave .  S waves are much more slower than P waves. They can only go through a solid , not through any liquid.  S waves move in a more shear motion
7. 7. Largest Earthquakes in California  Fort Tejon, California: Magnitude 7.9: 01/09/1857  San Francisco, California : Magnitude 7.8 : 04/18/1906  Imperial Valley, California : Magnitude 7.8 : 02/24/1892  Owens Valley, California : Magnitude 7.4 : 03/26/1872  Landers, California : Magnitude 7.3 : 06/28/1992
8. 8. After Shock  After a large earthquake occurs, there is still a danger and possibility of an after shock hitting.  After Shock: a smaller earthquake, sometimes one of many, that follow a large scale earthquake.  After Shocks occur because even though the tension with the 2 plates is released, their edges need to adjust to new positions. These edges will not always be able to pass each other smoothly, and this readjustment generates smaller shocks.
9. 9. Fault Lines