This animation of a part of Alan L. Jones' Seismic Waves program works was produced by R.Welti, IRIS. The 2004 Sumatra generated seismic waves that traveled through and around the globe. The seismic waves were recorded on the seismic stations shown on the animation. Watch the seismograms at the top of the animation develop with time. Notice that the further from the earthquake is, not only to the first waves arrive later, but the time between the P and S waves is increasing.
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