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Seismic Detection

Did you know that we get earthquakes in Australia? They are usually low magnitude, so not many people (if any) feel them. However, there is sensitive equipment based all over Australia which can detect them when they occur and be used to locate the exact location where they originated from. Photograph of a seismometer (Wikimedia, accessed 15/6/2020) Seismometers are used to detect earthquakes. In more basic models, they are a roll of paper which is continuously pulled. Above the paper is a pen which marks the paper as it moves. If there is no ground movement the mark the pen leaves is just a straight line. When there is an earthquake the pen shakes with the movement and this is shown as a seismic trace on the paper. The more the ground shakes the larger the seismic trace.  Seismogram – this is the graph output by a seismograph. (Wikimedia, accessed 15/6/2020) For more information on how seismometers work watch this video from Geoscience Australia: Earthquake monitoringTo have a go at ma…

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