A P wave velocity model of Earth's core

Song Xiaodong Song, D. V. Helmberger

Research output: Contribution to journalArticlepeer-review


Present Earth core models derived from the retrieval of global Earth structure are based on absolute travel times, and/or free-oscillation eigenfrequencies. Many core phase data are left out of these constructions. This study is an attempt to utilize the additional information to construct a model of core P wave velocity which is consistent with the different types of core phase data available. A one-dimensional P wave velocity model of the core, PREM2, is proposed. This model, modified from the Preliminary Reference Earth Model (Dziewonski and Anderson, 1981), shows a better fit to the combined data set than any of the existing core models. Major features of the model include a sharp velocity discontinuity at the inner core boundary, with a large jump (0.78 km/s), and a low velocity gradient at the base of the fluid core. -from Authors

Original languageEnglish (US)
Pages (from-to)9817-9830
Number of pages14
JournalJournal of Geophysical Research
Issue numberB6
StatePublished - 1995
Externally publishedYes

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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