Earthquakes - It's Causes And Effects
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Transcript of Earthquakes - It's Causes And Effects
Earthquakes -
It's Causes And Effects
Outline
What are Earthquakes ?
Types
It's Causes.
It's Effects
Definition -
A sudden violent shaking of the ground, typically causing great destruction, as a result of movements within the earth's crust or volcanic action.
What Are Earthquakes ???
Types Of Earthquakes
Earthquakes
Tectonic Volcanic
Collapse Explosion
Tectonic Earthquakes
A tectonic earthquake is one that occurs when the earth's crust breaks due to geological forces on rocks and adjoining plates that cause physical and chemical changes.
Volcanic Earthquakes
A volcano earthquake is an earthquake induced by the movement (injection or withdrawal) of magma.
The movement results in pressure changes in the rock around where the magma has experienced stress.
Collapse Earthquakes
Collapse earthquakes are small earthquakes occuring in regions of underground caverns and mines.
The immediate cause of ground shaking is the collapse of the roof of the mine or cavern.
Explosion Earthquakes
An Explosion Earthquake is an earthquake which results of nuclear and chemical devices.
This occurs when enormous energy nuclear energy is released
Natural Cause
Earthquakes are the result of slow-moving processes that operate within Earth.
Earth was hot when it formed, and has been cooling ever since (near the surface, for each km into Earth, the temperature rises by about 30deg. Celsius).
Earth's cooling causes the portions of Earth to move, and that movement is what we call an earthquake.
Some Of Human Desicions That Have Induced Earthquakes-
Dams & Reservoirs
Groundwater Extraction
Geothermal Power Plant
Injection Well
Skyscrapers
Effects Of Earthquakes
The Destructive Effects of an Earthquake can be classified into primary and secondary effects.
Primary Effects
They are the immediate damage caused by the quake, such as collapsing buildings,roads and bridges, which may kill many people. Those lucky enough to survive can suffer badly from shock and panic
Secondary Effects
They are the after- effects of earthquake
Secondary Effects
TsunamisSoil
LiqefactionFire
Disease And Famine
Landslides