How Earthquakes Happen (OCR GCSE Geography B (Geography for Enquiring Minds)): Flashcards
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Cause of earthquakes
Cause of earthquakes
Movement of tectonic plates
Focus (hypocenter)
Focus (hypocenter)
Point underground where earthquake originates
Epicenter
Epicenter
Point on Earth's surface directly above the focus
Seismic waves
Seismic waves
Energy waves spreading from focus through Earth
Deep focus earthquake depth
Deep focus earthquake depth
70-700km below Earth's surface
Shallow focus earthquake depth
Shallow focus earthquake depth
Within 70km of Earth's surface
Why shallow focus quakes more dangerous
Why shallow focus quakes more dangerous
Horizontal waves damage wider area despite less energy
Richter scale measures
Richter scale measures
Magnitude (energy released)
Mercalli scale measures
Mercalli scale measures
Effects and damage caused by earthquake
Seismometer function
Seismometer function
Detects and records seismic waves from earthquakes