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Unit 1 - Tectonic Hazards - Key Terms (AQA GCSE)
Some key terms and definitions for key concepts in the Tectonic Hazards section of Unit 1.
Terms in this set (18)
These are events which pose potential risks of damage to property and loss of life.
This is the chance or probability of being affected by a natural event
Plate Margin / Boundary
The point where two plates meet
As the dense oceanic plate sinks into the mantle under gravity pulling the plate with it.
The push of a plate away from a ridge as new land is created.
Where two plates move towards each other (e.g. Nazca and South American Plate forming the Andes) - can include both oceanic - continental convergence and oceanic-oceanic convergence
Where two plates move away from each other (e.g. North America and Eurasian Plate - at the Mid Atlantic Ridge).
Where two plates slide past each other (e.g. Pacific and North American Plates - along the San Andreas fault).
Where two plates of continental crust collide (e.g. Indo-Australian and Eurasian Plate - forming the Himalayas)
The shaking of the earth's crust due to the release of energy in the form of seismic waves.
The point underground where the earthquake starts
Point on the surface directly above the focus - often where the most damage occurs.
The amount of energy released by an earthquake
Richter Scale / Moment Magnitude Scale
Measures of the amount of energy released by an earthquake
Those which occur as a direct result of either the immediate ground shaking (e.g. buildings collapsing) or in the case of volcanoes, the eruption of the volcano (landscape destroyed by pyroclastic flows)
Those which occur as a result of the primary effect, often later on - e.g. tsunamis, fire etc.
Shock waves of energy travelling through rock to the surface
Small earthquakes following a major earthquake
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