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Seismicity - Earthquakes
Descrição
Part 1. seismicity
Sem etiquetas
aqa
geography
alevel
geography
natural hazards
a level
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Evie Davis
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Evie Davis
mais de 7 anos atrás
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Resumo de Recurso
Seismicity - Earthquakes
Earthquakes - these are events of violent shaking of the crust caused by a sudden release of pressure.
pressure is released in the focus, shock waves have the highest level of energy. Energy dissipates as you move away from the focus.
shallow focus - 0-70km
intermediate - 70-300km
deep - 300-700km
The area directly above the focus is the epicentre.
Types of seismic waves
P-Waves - fastest, shake backwards/forwards, move through solids and liquids
S-Waves - slower, move sideways, shake at right angles, cannot move through liquid, more damaging than p-waves
Surface waves - near surface, significantly slower, more destructive
L-waves - long waves - ground moves sideways
Raleigh waves - moves ground up and down
Magnitude - the amount of energy released, usually measured on the Richter scale
each unit represents a 10x increase in strength and a 30x increase in energy released
intensity is measured by its effects on the Mercalli scale
Frequency - varies between active regions such as Sudan trench and seismic zones within the shield of ancient crust like Greenland.
Seismometers measure the shockwaves, it can be used to distinguish patterns.
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