Shear wave travel time, amplitude, and waveform analysis for earthquakes in the Kurile slab: constraints on deep slab structure and mantle heterogeneity

S. Y. Schwartz, T. Lay, S. L. Beck

Research output: Contribution to journalArticle

12 Scopus citations

Abstract

Shear wave travel times, amplitudes and broadband waveforms from 16 events in the Kurile slab are analyzed to place further constraints on the seismic velocity heterogeneity asociated with the subducted oceanic lithosphere. The absence of a strong deep slab effect on the shear waves indicated that deep slab heterogeneity is less pronounced for shear waves than expected on the basis of existing P wave models derived from travel time residual sphere analysis. Various interpretations include: estimates of δVs/δT and compositional effects previously used to predict shear velocity structure of the deep Kurile slab are in error, with actual lower mantle slab anomalies being much weaker than proposed; the Kurile slab is so distorted in the lower mantle that no source depth dependent trends are produced for our limited focal sphere coverage; or the Kurile slab does not penetrate into the lower mantle. -from Authors

Original languageEnglish (US)
Pages (from-to)14,445-14,460
JournalJournal of geophysical research
Volume96
Issue numberB9
DOIs
StatePublished - 1991

ASJC Scopus subject areas

  • Geophysics
  • Forestry
  • Oceanography
  • Aquatic Science
  • Ecology
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Palaeontology

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