Earthquakes 0.0 / 5 ? GeographyNatural hazardsA2/A-levelEdexcel Created by: 12broweCreated on: 23-12-17 16:33 Describe the global distributon of earthquakes Plate boundaries, mainly destructive (convergent) and conservative. They can occur in the middle of plates. Tis is called intraplate. 1 of 9 What are the causes of an earthquake? Sudden movement within the earth's crust where pressure builds up and causes the plates to move suddenly. 2 of 9 Name the 3 waves that occur due to sudden movements of the plates? P Waves, S Waves and L Waves 3 of 9 What is the Hypocentre? Where the pressure of the earthquake is released. 4 of 9 What is the epicentre? The point on the earths surface which is directly above the hypocentre. 5 of 9 Name 3 secondary hazards as a result of an earthquake? Liquefacation, Landslides and Tsunamis 6 of 9 What is liquefaction? Where sesimic activity causes the ground to lose its shape and structure and become squidgy. Causes buildings to lose strength and collapse. 7 of 9 What is a landslide? Where slopes are weakened due to seismic activity and slide due to gravity. 8 of 9 What is a Tsunami? A sequence of huge waves created by a large displacemnt of sea water. Usually by an undersea earthquake. 9 of 9
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