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We analyzed the travel time differences of pre-critical reflected PcP and PKiKP waves from the outer and inner core boundary, respectively, for 23 regions. Four different models were used as reference models: PREM, ak135, LLNL_G3D_JPS, DETOX-P3. The LLNL_G3D_JPS model turned out to be the closest to the observed data. The connection between anomalous travel-time differences under the Southern Urals, Central Asia, and Chukotka and inhomogeneities in the lower mantle was established. Under Central America, a correspondence was demonstrated between the decrease in distance from the center of the inner core, the increase in temperature, and the increase in the velocity of P-wave in the uppermost inner core. Under the central part of Eurasia, an increase in the distance from the center of inner core is accompanied by an decrease in temperature and an increase in the P-wave velocity in the near-surface layer of the inner core.

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Variations of Travel Times of PKiKP and PcP Waves in the Light of Some Models of the Earth’s Core and Lower Mantle

  • 会议论文

  • 发表日期：

    2026年

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  • Olga A. Usoltseva,
  • Vladimir M. Ovtchinnikov

摘要

We analyzed the travel time differences of pre-critical reflected PcP and PKiKP waves from the outer and inner core boundary, respectively, for 23 regions. Four different models were used as reference models: PREM, ak135, LLNL_G3D_JPS, DETOX-P3. The LLNL_G3D_JPS model turned out to be the closest to the observed data. The connection between anomalous travel-time differences under the Southern Urals, Central Asia, and Chukotka and inhomogeneities in the lower mantle was established. Under Central America, a correspondence was demonstrated between the decrease in distance from the center of the inner core, the increase in temperature, and the increase in the velocity of P-wave in the uppermost inner core. Under the central part of Eurasia, an increase in the distance from the center of inner core is accompanied by an decrease in temperature and an increase in the P-wave velocity in the near-surface layer of the inner core.