Multiscale inhomogeneities on the surface of the Earth's inner core
- Авторлар: Ovtchinnikov V.M.1, Usoltseva O.A.1
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Мекемелер:
- Sadovsky Institute of Geosphere Dynamics, Russian Academy of Sciences
- Шығарылым: Том 517, № 2 (2024)
- Беттер: 309-313
- Бөлім: GEOPHYSICS
- ##submission.dateSubmitted##: 31.01.2025
- ##submission.datePublished##: 29.12.2024
- URL: https://pediatria.orscience.ru/2686-7397/article/view/649987
- DOI: https://doi.org/10.31857/S2686739724080127
- ID: 649987
Дәйексөз келтіру
Аннотация
The analysis of differential travel-time residuals of reflected PcP and PKiKP waves that probe the core regions under Eurasia, Southeast Asia, and South America indicates a mosaic picture of the surface properties of the inner core, including large-scale and small-scale lateral inhomogeneities. A strong anomaly has been discovered under the Caspian Sea.
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Авторлар туралы
V. Ovtchinnikov
Sadovsky Institute of Geosphere Dynamics, Russian Academy of Sciences
Хат алмасуға жауапты Автор.
Email: ovtch@idg.ras.ru
Ресей, Moscow
O. Usoltseva
Sadovsky Institute of Geosphere Dynamics, Russian Academy of Sciences
Email: kriukova@mail.ru
Ресей, Moscow
Әдебиет тізімі
- Tkalčić H. The Earth’s Inner Core Revealed by Observational Seismology. Cambridge, UK: Cam bridge University Press. 2017. https://doi.org/10.1017/ 9781139583954
- Овчинников В. М., Краснощеков Д. Н. Сейсмические исследования ядра Земли // Физика Земли. 2021. № 2. С. 3–26. doi: 10.31857/S0002333721020083.
- Адушкин В. В., Овчинников В. М. О мозаичности отражающих свойств поверхности внутреннего ядра Земли // ДАН. 2004. Т. 397. № 6. С. 815–817.
- Krasnoshchekov D. N., Kaazik P. B., Ovtchinnikov V. M. Seismological evidence for mosaic structure of the surface ofthe Earth’s inner core // Nature. 2005. V. 435. P. 483–487.
- Niu F., Wen L. Hemispherical variations in seismic velocity at the top of the Earth’s inner core // Nature. 2001. V. 410. P. 1081–1084.
- Simmons N. A., Myers S. C., Joannesson G. M., Matzel E. LLNL-G3Dv3: global P wave tomography model for miproved regional and teleseismic travel time prediction // J. Geopys. Res.: Solid Eaarth. 2012. 117 (B10). 189–200.
- Kennett B. L. N., Engdahl E. R., Buland R. Con straints on seismic velocities in the Earth from tra veltimes // Geophys. J. Int. 1995. 122(1). 108–124. doi: 10.1111/j.1365-246X.1995.tb03540.x.
- Souriau A., Souriau M. Ellipticity and density at the inner core boundary from subcritical PKiKP and PcP data // Geophys. J. Int. 1989. V. 98. P. 39–54.
- Oreshin S., Vinnik L. Heterogeneity and anisotropy of seismic attenuation in the inner core // Geophys. Res. Lett. 2004. V. 31. L02613.
- Tanaka S., Hamaguchi H. Degree one heterogeneity and hemispherical variation in anisotropy in the inner core from PKP(BC) – PKP(DF) times // Journal of Geophysical Research. 1997. V. 102. P. 2925–2938.
- Koper D. K., Pyle M. L. Franks J. M. Constraints on aspherical core structure from PKiKP-PcP differential travel times //J. Geophys. Res Solid Earth. 2003. V. 108. P. 2168. https://doi.org/10.1029/2002JB002750
- Stevenson D. J. Limits of lateral density and velocity variation in the Earth’s outer core // Geoph. J. R. Astron. Soc. 1987. V. 88. P. 311–319.
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Әрекет
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Fig. 1. Fragments of seismograms of the Pamir-Hindu Kush earthquake of August 8, 2019 at seismic stations: (a) in Kazakhstan and Kyrgyzstan, (b) in Turkey, (c) in Eastern Siberia.
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Fig. 2. Map of earthquake foci (red stars), seismic stations (triangles) and projections of reflection points (yellow hexagons) from the inner core of PKiKP waves. The inset shows a diagram of rays for PcP and PKiKP waves.
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Fig. 3. Spatial distribution of ddt on a large-scale world map and small-scale details in three regional insets: (a) Argentina, (b) Mongolia, (c) Chukotka. Red lines indicate low-velocity zones in the D” layer of the lower mantle, and green lines indicate zones of tectonic disturbances in the earth’s crust. Ovals indicate data on nuclear explosions [8].
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Fig. 4. Variations in differential travel times and the amplitude ratio of PKiKP and PcP waves observed at seismic stations in Japan during the Okhotsk Sea earthquake on May 24, 2013. Circles indicate variations in the amplitude ratio, asterisks indicate variations in differential travel time residuals.
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