Your SlideShare is downloading. ×
0
Earthquake
Earthquake
Earthquake
Earthquake
Earthquake
Earthquake
Earthquake
Earthquake
Upcoming SlideShare
Loading in...5
×

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.
Text the download link to your phone
Standard text messaging rates apply

Earthquake

3,261

Published on

Published in: Technology, Education
0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total Views
3,261
On Slideshare
0
From Embeds
0
Number of Embeds
2
Actions
Shares
0
Downloads
182
Comments
0
Likes
0
Embeds 0
No embeds

Report content
Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
No notes for slide

Transcript

  • 1. ALBA ARRANZGARCÍA 4ºA
  • 2. What is an earthquake? <ul><li>It is a sudden, rapid shaking of the Earth caused by the breaking and shifting of rock beneath the Earth´s surface and it creates seismic waves. </li></ul><ul><li>http://www.youtube.com/watch?v=-zNyVPsj8zc&amp;feature=related </li></ul>
  • 3. How we measure earthquakes? <ul><li>We can measure the magnitude and the intensity of an earthquake and we have a scale for each one. </li></ul><ul><li>Richter scale : Is a seismic scale which measure the magnitude of an earthquake. </li></ul><ul><li>Mercalli scale: Is a seismic scale which measure the intensity of an earthquake. </li></ul><ul><li>The instrument that is used for measure an earthquake is called seismograph. </li></ul>
  • 4. Where earhtquakes occur? <ul><li>Earthquakes usually occur in plate boundaries (Convergent, Divergent and Transform) and faults ( Normal, Reverse and Strike-slip). </li></ul><ul><li>The Hypocentre or focus is the point inside the Earth where the earthquake occur. </li></ul><ul><li>The Epicentre is the first place on the surface of the Earth where the seismic waves arrived. </li></ul>
  • 5. TIPES OF WAVES <ul><li>P waves: </li></ul><ul><li>-Primary waves </li></ul><ul><li>-Compresional waves </li></ul><ul><li>-Longitudinal in nature </li></ul><ul><li>-Are pressure waves initial in earthquakes </li></ul><ul><li>-Could travel through any tipe of materia </li></ul><ul><li>-They travel as speed of the sound </li></ul><ul><li>S waves: </li></ul><ul><li>-Secondary waves </li></ul><ul><li>-Shear waves </li></ul><ul><li>-Transverse in nature </li></ul><ul><li>-Follow the P waves in straight line </li></ul><ul><li>-Only travel throuhg solids. </li></ul><ul><li>-They travel half speed of P waves </li></ul>
  • 6. Efects of the Earthquake <ul><li>When the earthquake is produce inside an ocean or a sea is called Tsunami and beacaus the shaking big waves are produced. </li></ul><ul><li>Because of the greats shakings of earthquakes ground ruptures are produced. </li></ul><ul><li>They can produces avalanches because of the shaking snow, rocks, etc that are at the top or in a ramp fall down. </li></ul>
  • 7. Seismic risk areas <ul><li>If lot of earthquakes are produced in an area in few time it is a seismic risk area . </li></ul><ul><li>Most of the risk areas are found in plate boundaries. </li></ul><ul><li>Some risk areas are California, Alaska, italy, Greece, Turkey, some parts of the centre of Asia, New Zaland and Japan. </li></ul>
  • 8. &nbsp;

×