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Mechanical Q-Factor in the Earth’s Upper Inner Core Inferred from PKiKP Coda Waves

Authors
  • Krasnoshchekov, D. N.
  • Ovtchinnikov, V. M.1
  • Usoltseva, O. A.1
  • 1 Sadovsky Institute of Geosphere Dynamics, Russian Academy of Sciences, Moscow, 119334, Russia , Moscow (Russia)
Type
Published Article
Journal
Izvestiya, Physics of the Solid Earth
Publisher
Pleiades Publishing
Publication Date
Sep 01, 2021
Volume
57
Issue
5
Pages
593–604
Identifiers
DOI: 10.1134/S1069351321050141
Source
Springer Nature
Keywords
Disciplines
  • Article
License
Yellow

Abstract

Abstract—Based on the alpha-shape computer-graphics analysis of coda envelope of the waves from nuclear explosions reflected from the inner core boundary (PKiKP), the estimates of the mechanical Q-factor are obtained for nine reflection regions beneath the Arctic, Central, and Southeast Asia with the average Q = 447 ± 43. The coda formation mechanism can be associated with the heterogeneities in the upper inner core with a characteristic linear size of 1–4 km and variations in P-wave velocity on the order of 1–3%.

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