13 terms

GCSE Earthquakes

Earthquakes and impacts set - for GCSE AQA from http://www.coolgeography.co.uk
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Terms in this set (...)

Earthquake
shaking and vibration at the surface of the earth resulting from underground movement along a fault plane of from volcanic activity
Focus
The point WITHIN the Earth's crust where an earthquake starts
Epicentre
the point on the Earth's surface directly above the focus of an earthquake
Richter scale
a scale that rates an earthquake's magnitude based on the size of its seismic waves
Mercalli Scale
a scale that rates earthquakes according to their intensity and how much damage they cause at a particular place
Shock waves
Earthquake energy
Longitudinal waves
Cause an up and down movement
Transverse waves
Cause a side to side movement
Primary waves
travel faster than secondary waves
Seismometer
Instrument used to measure horizontal or vertical motion during an earthquake.
Seismograph
The produced plot of a seismometer
Constructive margin earthquakes
are weaker in strength
Destructive and conservative margin Earthquakes
are stronger in strength