Earthquakes
- Created by: abi
- Created on: 05-04-13 19:51
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- Earthquakes
- Destructive
- plates move towards eachother
- Oceanic plate + continental plate. Denser oceanic is forced down into the mantle and destroyed
- Constructive
- plates move away from eachother
-
They
eventually
jerk past each
other, sending
out shock
waves. These
vibrations
are the earthquake.
- plates move towards eachother
- Nearest to the focus the waves are stronger - cause more damage
-
They
eventually
jerk past each
other, sending
out shock
waves. These
vibrations
are the earthquake.
- Magma rises to fill the gap and new land is formed.
- plates move away from eachother
- Conservative
- plates slide past eachother
-
They
eventually
jerk past each
other, sending
out shock
waves. These
vibrations
are the earthquake.
- Nearest to the focus the waves are stronger - cause more damage
-
They
eventually
jerk past each
other, sending
out shock
waves. These
vibrations
are the earthquake.
- Or are moving in the same direction at different speeds.
- plates slide past eachother
- An earthquakes is the shaking vibration of the earth's crust due to movement of the earth's plates. When plates stick together, pressure builds up and causes a violent earthquake
- Epicentre - The point on the Earth's surface, directly above the focus.
- Focus - The point in the Earth where the earthquake starts.
- Plates
- The centre of the earth is the core
- Inner - ball of solid iron and nickel.
- Outer - liquid. Around it is the mantle, which is semi- molten rock.
-
Liquefaction
- Shockwaves can cause groundwater to rise to the surface turning soft ground to mud. Any buildings built on clay, will sink and collapse.
-
Measuring
Earthquakes
-
Richter scale
- Measures the magnitude by using a seismometer
- Mercalli scale
- Measures the effects. Scale of 1-12
-
Richter scale
- Destructive
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