1011+What+is+an+Earthquake?

=What is an Earthquake?= [|Earthquakes] are basically vibrations in the earth's surface or a slip of the plate tectonics.[1] There are 4 types of earthquakes, A Subduction, Man Maid or Explosion, Volcanic, and Collapse earthquakes.[2] A volcanic earthquake happens when a huge volcano erupts.[3] A man made earthquake happens when something like a nuclear power plant explodes.[4] A subduction earthquake is when one plate goes under another plate and then flicks up.[5] A Collapse earthquake is when a roof of a mine or cavern breaks and causes a small tremor.[6]

Subduction
A subduction quake is when one plate goes under another plate then flicks up.[5] This quake can cause larger tsunamis.[7] The tsunami in Japan or earthquake in Japan was most likely caused by a subduction earthquake. These quakes are usually located by volcanism.[5] The quake produces [|seismic wave] when the earthquake occurs.[5] the seismic waves send out vibrations or aftershocks.[5] 9 out of the 10 largest earthquakes were in subduction zones from the last 100 years.[5] This means that that the subduction earthquake is most likely the most powerful earthquake type.

Man Made or Explosion
This kind of earthquake can be caused by serious explosions.[6] The explosion is like a nuclear plant exploding or chemicals exploding.[6] There were lots of nuclear disasters like Three Mile Island and Chernobyl. These earthquakes are usually very small but can be still dangerous.[8] This can cause rock to vanish because of the explosion.[6] When it happens the pressure in the atmospere jumps by 1000 times and the tempature of the atmospere rises or jumps by 1000 times.[8]



Volcanic
A volcanic earthquake is related to a eruption of a volcano.[3] When the Volcano erupts it put pressure on the plates.[9] They move and change from the pressure and cause earthquake swarms.[9] Another way one could happen is when the magma moves and blocks the plates from moving which causes stress.[9] This earthquake is basically happens when magma moves (injection or withdrawal) under the plates.[9]

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Collapse
These quakes usually are near caverns or mines, and the force of the earthquake breaks the roof of the mine or cavern.[10] This causes the mine or cavern to cave in.[10] This earthquake must be very dangerous for miners in present day mines. Quakes like this one usually has magnitude of about 3.9.[11] This earthquake has seismic waves going in all directions.[11] If you want an example of a collapse earthquake here is an [|collapse earthquake] example.

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