Journal Article

Matrix autoregressive analysis of free‐oscillation coupling and splitting

Guy Masters, Gabi Laske and Freeman Gilbert

in Geophysical Journal International

Volume 143, issue 2, pages 478-489
Published in print November 2000 | ISSN: 0956-540X
Published online November 2000 | e-ISSN: 1365-246X | DOI: http://dx.doi.org/10.1046/j.1365-246X.2000.01261.x
Matrix autoregressive analysis of free‐oscillation coupling and splitting

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Summary

The study of the splitting and coupling of free oscillations can potentially provide some unique information about the Earth—in particular about how density varies laterally relative to shear velocity and bulk sound speed. Mode splitting has been studied for many years but it is clear that the time is ripe to revisit this field. In particular, the rapid expansion of the global seismic network and the occurrence of many large (and deep) earthquakes in the past few years means that mode‐splitting analyses are capable of much higher precision than in the past. Some studies have already argued that 3‐D density can be recovered (and that density variations are negatively correlated with shear velocity in the lower mantle). This result is controversial and we present some experiments that indicate that claims of density recovery with the current mode data set are premature. However, we believe that, with expanded data sets and new analysis techniques, the precision needed to recover the 3‐D density structure of the Earth and its 3‐D anelastic structure is now within our reach.

Keywords: density; free oscillations; mode splitting

Journal Article.  0 words. 

Subjects: Geophysics

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