Toroidal splitting observations from the Great 1994 Bolivia and Kuril Islands Earthquakes

Jeroen Tromp, Eva Zanzerkia

Research output: Contribution to journalArticle

27 Scopus citations

Abstract

The June 9, 1994, Bolivia earthquake and the October 4, 1994, Kuril Islands earthquake provide a unique opportunity for a splitting analysis of the Earth's long‐period toroidal free oscillations. We present toroidal splitting observations for the 6 fundamental modes 0T4, 0T5, 0T6, 0T7, 0T8, and 0T9, and for the 5 first overtones 1T1, 1T2, 1T3, 1T4 and 1T6. The first identification of mode 1T1 is made possible by simultaneously fitting the multiplets 1T1 and 0T7. The observed splitting is reasonably well explained by current shear velocity models of the mantle. Our analysis yields new estimates of the center frequencies and quality factors of these 11 toroidal modes.

Original languageEnglish (US)
Pages (from-to)2297-2300
Number of pages4
JournalGeophysical Research Letters
Volume22
Issue number16
DOIs
StatePublished - Aug 15 1995
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Earth and Planetary Sciences(all)

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