Plate Tectonics: Seismicity Flashcards Preview

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Flashcards in Plate Tectonics: Seismicity Deck (5)
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1

Earthquakes

Convection currents cause plates to interact at plate boundaries. High levels of stress build up and are eventually released, resulting in earthquakes.

2

Mid-Plate Earthquakes

1. Old plate boundaries e.g. China.
2. Isostatic rebound e.g. Canada.
3. Tropical cyclones.

3

Man-Made Earthquakes

1. Dams: Singchuan 2008.
2. Mining: Newcastle, Australia 1989.
3. Fracking: Lancashire.
4. Tall buildings: Taipai 101.

4

Earthquake Anatomy

The origin of the earthquake is called the focus/hypocentre.
The 3 categories of depth are shallow (0-70km), intermediate (70-300km), and deep (300-700km).
The point on the surface directly above the origin is the epicentre.

5

Seismic Waves

Waves of energy released by the rupture of rock strata at the hypocentre, travelling outwards in all directions. There are two types; P waves and S waves.