Envelope of coda waves for a double-couple source due to non-linear elasticity.
Abstract
We have shown recently (GJI 2008) that for an explosive source the envelope of coda waves can be understood by non-linear elasticity. This non-linearity is observed in laboratory experiments which show that the non-linear behavior of rocks exists close to the rupture condition. Since the study of non-linearity with an explosive source has shown a clear correlation between the theoretical model and experimental results, the next necessary step is to extend the theoretical work to other sources. Here we develop the theory of the envelope of coda waves for a general moment tensor source and discuss its implications. In particular, we show that for a double-couple source the non-linear behavior also affects the radiation pattern which is calculated for PP, PS, SP and SS waves. Finally, we investigate the fit between this model and the coda of some earthquakes, such as the Tarapaca, Chile earthquake and its replicas.
- Publication:
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AGU Spring Meeting Abstracts
- Pub Date:
- May 2009
- Bibcode:
- 2009AGUSM.S31A..09C
- Keywords:
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- 7260 Theory;
- 7299 General or miscellaneous