The white points you see on the graph below represent actual measured data of compression waves traveling through the earth.
To create your own model, enter a depth (in kilometers) between 0 and 6371 and a velocity (in kilometers per second) for each layer. Each layer is measured from the earth's surface to the bottom of that layer. Click the Draw button to see your model on the graph.
To add more earth layers to your model, click the Add Layer button. To remove layers from your model, click the Remove Layer button. Click Draw each time you add a new layer. To clear your data from the graph, click Reset.
If you do not see the graph above, click here to download the updated Java plugin.