I only know that Richter scale 3 will shake 0.1 mm at a distance of 100 kilometer. It increases by ten fold for each Richter scale magnitude. Give example how it will vary according the distance of epicenter. They say it is Inverse Square of the distance. Please explain with a model calculation. If an earthquake is measured from a distance of 2000 kilometers from epicenter and if the magnitude is 9 in Richter scale what will be the maximum shaking. Will the S wave pass through sea water.?

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