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Hi! Here are the few graphs that I produced with the LIGO E-Lab Bluestone program. I took the graphs from data on September 12, 2007 at 10:00:00 GMT to 14:00:00 GMT on the same day. On September 12, an earthquake struck southern Sumatra on 11:10:26 UTC, magnitude 8.4. The first two graphs show the raw ADC voltage, whereas the last two graphs were passed through a filter. Here's a PowerPoint that I put together regarding the earthquake and the relation of all these graphs: [|Sumatra Earthquake.ppt]. There's also another website that I found that gives an animation on P and S wave travel : [|P and S Wave Animation]. And, for the Purdue website I mentioned in the PowerPoint, here's the link: [|Wave Propagation]