Send the link below via email or IMCopy
Present to your audienceStart remote presentation
- Invited audience members will follow you as you navigate and present
- People invited to a presentation do not need a Prezi account
- This link expires 10 minutes after you close the presentation
- A maximum of 30 users can follow your presentation
- Learn more about this feature in our knowledge base article
Earthquakes and volcanoes
Transcript of Earthquakes and volcanoes
Given what we have been talking about the past few days- where do you think volcanoes and earthquakes are most likely to happen?
What causes earthquakes?
When plates move, their edges get stressed out.
If the plates cannot move where they want, energy from stress on the rocks will build up.
The stress will becomes so great that the rock will snap!
the movement that causes the shaking we feel
The exact point INSIDE the earth where the earthquake starts.
The point directly above the focus on the earth's surface, damage is greatest here, but can happen anywhere within a few km from the epicenter
Waves move in all directions from the focus
Primary "P" waves
Secondary "S" Waves
Moves by compressing and stretching rock
Moves in waves like a rope shaken up and down
Both move in all directions from the focus
Moves only on the surface
Caused by the movement of Earth as a whole- bends shakes and rolls
Seismographs measure P and S waves
Based on the P and S waves, scientists can calculate the epicenter of the earthquake
The Richter scale measures the energy released by a quake
The amount of damage caused depends on the distance between populated areas and the epicenter, depth of the focus, and type of soil
So does the energy matter that much in some areas?
How do you think scientists predict earthquakes, is it easy?
Following P and S waves through the earth can give us an idea of the earth's composition