Earthquake-case and measurement 0.0 / 5 ? GeographyRestless EarthGCSEAQA Created by: nimrahali12Created on: 23-08-16 10:52 What are the three types of earthquakes? destructive , constructive , conservative 1 of 18 What is a destructive margin? Tension builds up when one plate gets stuck as its moving down past the other into the mantle 2 of 18 What is a constructive margin? Tension builds along cracks within the plate as they move away from eachother 3 of 18 What is a conservative margin? tension builds up when plates that are grinding past each other get stuck 4 of 18 The plates eventually jerk past each other , sending out? shock waves (vibrations) 5 of 18 The shock waves spread out from the ___. focus 6 of 18 What is the focus? the point in the Earth where the earthquake starts 7 of 18 What happens near the focus? the waves are stronger and cause more damage 8 of 18 Where is the epicentre? The point on the Earths surface straight above focus 9 of 18 Weak earthquakes happen often but strong ones are ___ rare 10 of 18 What two scales are earthquakes measured by? Richter and Mercalli 11 of 18 What does the Richter scale measure? the amount of energy released by an earthquake called magnitude 12 of 18 The magnitude is measured using a ? seismometer - a machine with an arm that moves with the vibrations of the Earth 13 of 18 The Richter scale doesn't have an upper limit and its _________? logarithmic- this means that an earthquake with a magnitude of 5 is 10 times more powerful than one with a magnitude of 4 14 of 18 Most people dont't feel earthquakes pf magnitude _____. Major earthquakes are ___ 1-2 and 5 15 of 18 What does the mercalli scale measure ? This measures the effects of an earthquake 16 of 18 Effects are measured by? asking eye witnesses for observations of what happened by a form of words and photos 17 of 18 Whats the scale? 1-12 18 of 18
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