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Tomografía global de ondas superficiales utilizando hum sismico.

Kiwamu Nishida1, Jean-Paul Montagner, Hitoshi Kawakatsu

  • 1Earthquake Research Institute (ERI), The University of Tokyo, 1-1-1, Yayoi, Bunkyo-ku, Tokyo, Japan. knishida@eri.u-tokyo.ac.jp

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|October 3, 2009
PubMed
Resumen
Este resumen es generado por máquina.

El zumbido sísmico, las vibraciones de fondo de la Tierra, ofrece un nuevo método para la tomografía del manto superior sin terremotos. Esta técnica mapea la estructura de velocidad de onda S en 3D, avanzando en la exploración del interior planetario.

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Área de la Ciencia:

  • La geofísica es la geofísica.
  • Sismología Sismología Sismología.
  • Ciencias planetarias Ciencias planetarias.

Sus antecedentes:

  • La tomografía global de ondas superficiales tradicionalmente se basa en grandes terremotos para sondear el interior profundo de la Tierra.
  • Las ondas sísmicas de largo período son necesarias para la exploración profunda de la Tierra, que anteriormente se pensaba que eran generadas exclusivamente por grandes eventos sísmicos.
  • El descubrimiento del zumbido sísmico, las continuas oscilaciones libres de la Tierra de fuentes oceánicas / atmosféricas, presenta una fuente alternativa de ondas sísmicas.

Objetivo del estudio:

  • Desarrollar y presentar la tomografía sísmica global del manto superior utilizando el zumbido sísmico, independiente de los datos de terremotos.
  • Para medir las anomalías de velocidad de fase de las ondas de Rayleigh en períodos de 100 a 400 segundos.
  • Para invertir estas anomalías para una estructura tridimensional de velocidad de onda S del manto superior.

Principales métodos:

  • Utilizó el zumbido sísmico como fuente para la generación de ondas sísmicas.
  • Funciones de correlación cruzada modeladas entre pares de 54 estaciones sísmicas distribuidas globalmente.
  • Inversión realizada de las anomalías de velocidad de fase para derivar la estructura de velocidad de onda S 3D.

Principales resultados:

  • Generó con éxito una tomografía sísmica global del manto superior utilizando humedad sísmica.
  • Anomalías de velocidad de fase mapeadas de las ondas de Rayleigh a través de un rango de largos períodos (100-400 segundos).
  • Se obtuvo un modelo tridimensional detallado de la velocidad de las ondas S del manto superior.

Conclusiones:

  • El zumbido sísmico proporciona una alternativa viable y novedosa a los terremotos para la tomografía sísmica global.
  • La técnica desarrollada permite la exploración de la estructura interior tridimensional de los planetas terrestres.
  • Este método es particularmente aplicable a los planetas con atmósferas y/o océanos, incluido Marte.