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Updated: Jun 24, 2025

Data Processing Methods for 3D Seismic Imaging of Subsurface Volcanoes: Applications to the Tarim Flood Basalt
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El retroceso del núcleo interno por el cambio de forma de onda sísmica

Wei Wang1,2,3, John E Vidale4, Guanning Pang5

  • 1Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China.

Nature
|June 12, 2024
PubMed
Resumen
Este resumen es generado por máquina.

El núcleo interno sólido de la Tierra giró más rápido que la superficie entre 2003 y 2008, luego invirtió la dirección, girando más lentamente de 2008 a 2023. Este hallazgo, basado en el análisis de ondas sísmicas, sugiere que se necesitan nuevos modelos para la dinámica del núcleo de la Tierra.

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Área de la Ciencia:

  • La geofísica
  • Sismología
  • Ciencias de la Tierra

Sus antecedentes:

  • La rotación del núcleo interno sólido de la Tierra en relación con la superficie se ha inferido a partir de datos sísmicos.
  • La estructura y la dinámica del núcleo interno influyen en el campo magnético de la Tierra.
  • Estudios previos sugirieron diferentes velocidades de rotación del núcleo interno.

Objetivo del estudio:

  • Para rastrear con precisión la progresión y regresión del núcleo interno de la Tierra.
  • Para analizar la dinámica de rotación del núcleo interno utilizando datos de ondas sísmicas.
  • Para investigar la relación entre el movimiento del núcleo interno y el campo magnético de la Tierra.

Principales métodos:

  • Compilado 143 pares de terremotos repetidos de 1991-2023 en las Islas Sandwich del Sur.
  • Se analizaron las ondas PKIKP que penetran en el núcleo interno registradas en matrices de apertura media.
  • Cambios de forma de onda identificados y reversiones en múltiples terremotos repetidos para rastrear la posición interna del núcleo.

Principales resultados:

  • Cambios de forma de onda documentados y reversiones posteriores en múltiples, lo que indica que el núcleo interno vuelve a ocupar posiciones pasadas.
  • Se demostró que el núcleo interno super-rotado de 2003 a 2008.
  • Demostró que el núcleo interno sub-rotó de 2008 a 2023 a tasas de dos a tres veces más lentas, retrocediendo en su trayectoria.

Conclusiones:

  • El núcleo interno de la Tierra exhibe períodos de súper rotación y subrotación posterior más lenta, moviéndose hacia atrás por el mismo camino.
  • Ahora es posible hacer un seguimiento preciso de la progresión y regresión del núcleo interno.
  • Las diferentes velocidades de movimiento hacia adelante y hacia atrás requieren nuevos modelos para la dinámica entre el núcleo interno, el núcleo externo y el manto.