Earth's internally generated motions

Access through your institution Buy or subscribe THEORETICAL GLOBAL SEISMOLOGY * _F. A. Dahlen & _ * _Jeroen Tromp_ Princeton University Press: 1998. 1,025pp $80, £60 Since the

underlying seismic motion can be quantified using linear wave equations, and since the Earth is a body of finite size, we know that all seismic motions of our planet can be expressed as a

sum of the Earth's normal modes. Conceptually, every seismogram of every earthquake and explosion is a sum of the same set of decaying sinusoids, each of which begins its oscillation at

every point of the planet when the earthquake begins. In practice, the set sums to zero until the first body wave arrives, and thereafter it is a representation of the ground motion at that

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AND AFFILIATIONS * the Lamont-Doherty Earth Observatory, Palisades, 10964, New York, USA Paul G. Richards Authors * Paul G. Richards View author publications You can also search for this

author inPubMed Google Scholar RIGHTS AND PERMISSIONS Reprints and permissions ABOUT THIS ARTICLE CITE THIS ARTICLE Richards, P. Earth's internally generated motions. _Nature_ 397,

489–490 (1999). https://doi.org/10.1038/17268 Download citation * Issue Date: 11 February 1999 * DOI: https://doi.org/10.1038/17268 SHARE THIS ARTICLE Anyone you share the following link

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