Volcanos and Earthquakes (OCR GCSE Geography A (Geographical Themes)): Flashcards
📚Flashcards
Practise the cards
14 cards from this deck
ShowHide
Practise the cards
14 cards from this deck
% of active volcanoes at tectonic plate boundaries
% of active volcanoes at tectonic plate boundaries
60%
Belt encircling Pacific where most volcanoes found
Belt encircling Pacific where most volcanoes found
Ring of Fire
Areas in plate interiors where volcanoes form (e.g. Hawaii)
Areas in plate interiors where volcanoes form (e.g. Hawaii)
Hot spots
Plate margins where volcanoes occur
Plate margins where volcanoes occur
Destructive and Constructive
How many plate margins do earthquakes occur at?
How many plate margins do earthquakes occur at?
All 3 plate margins
Cause of earthquakes at destructive margins
Cause of earthquakes at destructive margins
Subducted plate scrapes against continental plate
Cause of earthquakes at conservative margins
Cause of earthquakes at conservative margins
Tension builds when sliding plates get stuck
Moment Magnitude Scale measures
Moment Magnitude Scale measures
Energy released by earthquake (magnitude)
Magnitude 7 earthquake vs magnitude 6 (power difference)
Magnitude 7 earthquake vs magnitude 6 (power difference)
10 times more powerful
Focus (earthquake)
Focus (earthquake)
Point in earth where earthquake starts
Effect of shallow focus on earthquake damage
Effect of shallow focus on earthquake damage
Stronger waves, more damage
Epicentre (earthquake)
Epicentre (earthquake)
Point on surface directly above focus
Primary effects (disasters)
Primary effects (disasters)
Immediate effects of disaster
Secondary effects (disasters)
Secondary effects (disasters)
Effects later, often result of primary effects