Seismic Hazards and Magnitude (AQA A-Level Geography): Flashcards
📚Flashcards
Practise the cards
10 cards from this deck
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Practise the cards
10 cards from this deck
Earthquake definition
Earthquake definition
Stress build-up in crust suddenly released, causing shaking
Focus (hypocentre) of earthquake
Focus (hypocentre) of earthquake
Point beneath surface where pressure is released
Epicentre of earthquake
Epicentre of earthquake
Point on surface directly above the focus
% of global earthquake energy from shallow focus (0-70km)
% of global earthquake energy from shallow focus (0-70km)
75%
Energy increase per 1 step on moment magnitude scale
Energy increase per 1 step on moment magnitude scale
32 times more energy
Energy increase per 2 steps on moment magnitude scale
Energy increase per 2 steps on moment magnitude scale
1,000 times more energy
Magnitude vs intensity
Magnitude vs intensity
Magnitude=energy released; Intensity=shaking at a location
Primary effects of earthquakes
Primary effects of earthquakes
Ground shaking and ground rupture
Secondary effects of earthquakes
Secondary effects of earthquakes
Soil liquefaction, landslides, avalanches, tsunamis
Main cause of earthquake deaths
Main cause of earthquake deaths
Secondary effects (not ground shaking itself)