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Published on: August 7, 2017
Tomografía de ondas superficiales de alta resolución por ruido sísmico ambiental
Nikolai M Shapiro1, Michel Campillo, Laurent Stehly
1Center for Imaging the Earth's Interior, Department of Physics, University of Colorado at Boulder, Boulder, CO, USA. nshapiro@ciei.colorado.edu
Resumen
El análisis del ruido sísmico revela California California.
Área de la Ciencia:
- La geofísica es la geofísica.
- Sismología Sismología Sismología.
- Ciencias de la Tierra Ciencias de la Tierra
Sus antecedentes:
- Comprender la estructura de la corteza terrestre es crucial para las evaluaciones de riesgos geológicos y sísmicos.
- Los métodos tradicionales de imágenes sísmicas pueden ser limitados en resolución y adquisición de datos.
Objetivo del estudio:
- Desarrollar y aplicar un nuevo método para obtener imágenes de la estructura de la corteza de California.
- Para utilizar el ruido sísmico ambiental para imágenes geofísicas de alta resolución.
Principales métodos:
- El ruido sísmico ambiental registrado por las estaciones USArray en California estaba correlacionado.
- Se obtuvieron mediciones de velocidad de grupo de ondas superficiales para trayectorias entre estaciones.
- Las imágenes tomográficas de las unidades geológicas de California se construyeron utilizando estas mediciones.
Principales resultados:
- Se generaron cientos de mediciones de velocidad de grupo de ondas superficiales de corto período.
- Las imágenes tomográficas delinearon claramente las principales unidades geológicas.
- Anomalías de baja velocidad correlacionadas con cuencas sedimentarias; anomalías de alta velocidad correlacionadas con núcleos de cordilleras.
Conclusiones:
- La correlación cruzada del ruido sísmico ambiental proporciona datos efectivos de ondas superficiales para las imágenes de la corteza.
- Esta técnica mejora la resolución y la fidelidad de las imágenes de la corteza terrestre en comparación con los métodos convencionales.
- El estudio mapeó con éxito las principales unidades geológicas de California utilizando ruido sísmico.
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