Check the scale on your map. It should look something like a piece of a ruler. All maps are different. On your map, one centimetre could be equal to 100 kilometres or something like that. Figure out how long the distance to the epicentre (in centimetres) is on your map. For example, say your map has a scale where one centimetre is equal to 100 kilometers. If the epicentre of the earthquake is 215 kilometers away, that equals 2.15 centimetres on the map. Using your compass, draw a circle with a radius equal to the number you came up within the centre of the circle will be the location of your seismograph. The epicentre of the earthquake is somewhere on the edge of that circle.
