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99986
Earthquakes and fold mountains
Descrição
GCSE Geography (Physical) Mapa Mental sobre Earthquakes and fold mountains, criado por jeacur em 20-05-2013.
Sem etiquetas
geography
physical
geography
physical
gcse
Mapa Mental por
jeacur
, atualizado more than 1 year ago
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Criado por
jeacur
mais de 11 anos atrás
101
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Resumo de Recurso
Earthquakes and fold mountains
Earthquakes
A sudden and brief period of intense ground shaking
Focus
The point in the earth's crust where the earthquake originates
Epicentre
The point at the earth's surface directly above the focus (this is also where the shock waves are strongest and where most damage occurs)
Shockwave
Seismic waves generated by the earthquake that pass through the earth's crust
Measuring
Richter scale
A seismograph measure shock waves on Richter scale
Each point is 10 times stronger than one below
No upper limit
Adv. is quantatative not qualatative
Mercalli scale
A way of measuring by description
1 - barely felt, 5 = felt by almost everyone, sleeping people awoken and windows break
Fold mountains
Form at destructive plate margins
Where 2 continental plates collide at destructive plate margin e.g. Himalayas
There is a geosyncline at the fault of the 2 plates
Sediment is compressed in layers by overlying sediments in this to form rock
Continued compression from both plates cause the rocks to fold into mountains
These fold can be simply made up of synclines and antisyclines or if there is more pressure from one plate than the other, overfolds can occur
Where an oceanic and continental plate collide at destructive subduction margin e.g. Andes
As one plate subducts under the other, it pulls the plate down with it, creating an extra deep area of the ocean, which is the trench
As well, as the plate subducts underneath it causes the plate to crumple/fold up into fold mountains
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