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El movimiento diferencial del núcleo interno confirmado por la forma de onda del terremoto dobla los dobles.

Jian Zhang¹, Xiaodong Song, Yingchun Li

¹Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY 10964, USA.

Science (New York, N.Y.)

|August 27, 2005

Resumen

El núcleo interno de la Tierra gira más rápido que el manto y la corteza. El análisis de las ondas sísmicas que pasan a través del núcleo interno confirma esta rotación, estimada en 0,3 a 0,5 grados por año.

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Área de la Ciencia:

La geofísica es la geofísica.
Sismología Sismología Sismología.
Ciencias de la Tierra Ciencias de la Tierra Ciencias de la Tierra

Sus antecedentes:

Las propiedades del núcleo interno de la Tierra son difíciles de estudiar.
Las ondas sísmicas que atraviesan el núcleo interno proporcionan información sobre su dinámica.

Objetivo del estudio:

Para analizar los cambios temporales en los tiempos de viaje de las ondas sísmicas.
Para confirmar la rotación del núcleo interno de la Tierra en relación con el manto y la corteza.

Principales métodos:

Análisis de 18 dobles de forma de onda de alta calidad de la región de las Islas Sandwich del Sur.
Seguimiento de señales sísmicas (PKP(DF)) que han pasado a través del núcleo interno.
Utilizando datos de 58 estaciones en y cerca de Alaska para observar las variaciones en el tiempo de viaje.

Principales resultados:

Se observaron cambios temporales consistentes en los tiempos de viaje de las ondas sísmicas.
Se observaron diferencias en las codas de onda PKP (DF).
El estudio confirmó que el núcleo interno de la Tierra está girando más rápido que el manto y la corteza.

Conclusiones:

La rotación del núcleo interno de la Tierra se confirma en aproximadamente 0.3 a 0.5 grados por año.
El análisis del doble de la forma de onda mitiga efectivamente los problemas de las localizaciones erróneas de los terremotos y las heterogeneidades a pequeña escala.