Coastal & Marine Geology InfoBank

USGS CMG InfoBank: Deriving Distances and Shapes


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Comment: 04:38 - 05:01 (00:23)

Source: Annenberg/CPB Resources - Earth Revealed - 3. Earth's Interior

Keywords: "Thomas Henyey", "seismic wave", distance, shape

Our transcription: So the principal information we get then are distances of objects from the surface of the Earth.

This, in effect, defines the geometry of an object because as we illuminate or shine our seismic waves on different parts of the body.

Those different parts might be at different distances from the surface of the Earth, and, therefore, were outlining the shape of the body.

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U.S. Department of the Interior \| U.S. Geological Survey URL: http://walrus.wr.usgs.gov/infobank/programs/html/school/moviepage/03.01.06.html Page Contact: InfoBank staff Page Last Modified: Fri Sep 18 02:35:42 PDT 2009 (wcs)