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This portal provides access to a variety of resources explaining the methods used to determine the location and depth of an earthquake. The resources include the 'Travel Time Information and Calculator', an online tool that lets users choose a seismic station location and a recent earthquake, and see how long it takes different types of seismic waves to travel from the epicenter to their locations. There is also a discussion of how earthquake depths are determined by examining the characteristics of the S- and P-waves, an animation of seismic waveforms, and a selection of activities, slideshows, and other references.
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