File:Earth free oscillation spheroidal mode n=1 l=3 m=2 bis cutaway.webm
Earth_free_oscillation_spheroidal_mode_n=1_l=3_m=2_bis_cutaway.webm (WebM audio/video file, VP9, length 2.9 s, 640 × 480 pixels, 461 kbps overall, file size: 161 KB)
Captions
Captions
Summary
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English: These animations were created to illustrate the free oscillations of the Earth. This doesn't require a very accurate model. The periods which are displayed in the captions come from real measurements.
The model used for calculating the animations assumes that the Earth is made of an homogeneous isotropic material, i.e., that it is made of the same material everywhere. This is wrong. The mass density and sound speeds which were used are averaged values. The calculation can be reproduced with the calculator for an isotropic sphere. Other refinements (gravity, Coriolis, ...) were not taken into account either. Earth non-sphericity was introduced to partially lift the m degeneracy. The Earth map is from NASA. It is the 2002 Blue Marble and is in the public domain. The animations were computed using POV-Ray. |
| Date | |
| Source | https://saviot.cnrs.fr/terre/index.en.html |
| Author | Lucien Saviot |
Licensing
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This file is made available under the Creative Commons CC0 1.0 Universal Public Domain Dedication. |
| The person who associated a work with this deed has dedicated the work to the public domain by waiving all of their rights to the work worldwide under copyright law, including all related and neighboring rights, to the extent allowed by law. You can copy, modify, distribute and perform the work, even for commercial purposes, all without asking permission.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 06:31, 6 July 2024 | 2.9 s, 640 × 480 (161 KB) | Tim Starling (talk | contribs) | {{Information |description={{en|1= These animations were created to '''illustrate''' the free oscillations of the Earth. This doesn't require a very accurate model. The periods which are displayed in the captions come from real measurements. The model used for calculating the animations assumes that the Earth is made of an homogeneous isotropic material, i.e., that it is made of the same material everywhere. This is wrong. The mass density and sound speeds which were used are averaged values... |
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