0
Upcoming SlideShare
×

Thanks for flagging this SlideShare!

Oops! An error has occurred.

×
Saving this for later? Get the SlideShare app to save on your phone or tablet. Read anywhere, anytime – even offline.
Standard text messaging rates apply

# Sharon joji and rajat

679

Published on

3 Likes
Statistics
Notes
• Full Name
Comment goes here.

Are you sure you want to Yes No
• Be the first to comment

Views
Total Views
679
On Slideshare
0
From Embeds
0
Number of Embeds
1
Actions
Shares
0
69
0
Likes
3
Embeds 0
No embeds

No notes for slide

### Transcript

• 1. earthquakes ! !! e m e Sav By Sharon and Rajat
• 2. What is an Earthquake?Earthquakes: Vibrations (seismic waves)Earthquakeswithin Earth materials are produced by the rapidrelease of energy &#xF0FC; Earth&#x2019;s crust is in constant motion because of tectonic forces &#xF0FC; Earth&#x2019;s crust can store elastic energy &#xF0FC; When forces exceed the elastic limits and structural strength of the rocks, the rocks will break and/or move producing vibrations that travel outward in all directions
• 3. Earthquakeso The actual place underground where the rocks break producing vibrations is called the focuso The place on the surface directly above the focus is called the epicenter
• 4. What types of forces are created?Compression Force: Force&#xF0FC; force pushing something together&#xF0FC; Makes a reverse fault
• 5. What types of forces are created?Tension Force: Force&#xF0FC; stretching or pulling force&#xF0FC; Makes a normal fault
• 6. What types of forces are created?Shear Force: Force&#xF0FC; a system of forces that operates against a body from different sides&#xF0FC; Makes a strike-slip fault
• 7. http://www.geo.uib.no/jordskjelv/index.php?topic=earthquakes&amp;lang=en
• 8. http://www.geo.uib.no/jordskjelv/index.php?topic=earthquakes&amp;lang=en
• 9. What causes Earthquakes? when the&#xF0FC; Movement along faults: occurs energy exceeds the friction holding the sides of the fault together and is suddenly released&#xF0FC; .Movement of magma (volcanic)&#xF0FC; Volcanic eruptions
• 10. Originate at the focus and travel outward in al Seismic Waves directions &#xF0FC; Foreshocks: small earthquakes that come Foreshocks before a major earthquake &#xF0FC; Aftershocks: Are adjustments in the crust Aftershocks after in earthquake o Smaller than main earthquake, but can cause as much or more damage. They can continue for weeks to months. Not every earthquake months produces aftershocks
• 11. 3 Types of seismic Waves&#xF0FC; P waves (primary waves) Compressional wave &#xF0A7; Particles move back and forth in the same direction as the wave &#xF0A7; Travels the fastest &#xF0A7; Can pass through solids and liquids (gases also) &#xF0A7; Does not cause damage
• 12. Types of Waves&#xF0FC; S wave (secondary wave, shear wave) &#xF0A7; Particles move at right angles to the direction of the wave &#xF0A7; Travels slower than P waves &#xF0A7; Can pass through solids only &#xF0A7; Does not cause damage
• 13. Types of Waves&#xF0FC; L wave (long wave, surface wave, ground wave) &#xF0A7; Particles move in elliptical orbit &#xF0A7; Originates on the surface after the P and S waves go straight up from the focus and reach the surface &#xF0A7; The L wave causes the damage and will be the strongest at the epicenter &#xF0A7; Travels the slowest
• 14. &#xF0FC; Earthquake Safety Protect yourself from falling objects (GET UNDER SOMETHING) or stand in a hallway or doorway (watch out for a swinging door)&#xF0FC; Do not try to go outside during the earthquake&#xF0FC; After the earthquake and before the aftershocks, go outside&#xF0FC; Do not return to the building until it has been inspected
• 15. Why japan is stillalive after the massiveearthquake
• 16. Sharon and Rajat