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Análisis de la fuente del Cañón Crandall, Utah, colapso de la mina
Douglas S Dreger1, Sean R Ford, William R Walter
1Berkeley Seismological Laboratory, University of California, Berkeley, CA 94720, USA. dreger@seismo.berkeley.edu
Science (New York, N.Y.)
|July 16, 2008
Resumen
Un evento sísmico de Utah de 2007 mostró un patrón de radiación inusual, lo que indica un colapso subterráneo poco profundo en lugar de un típico terremoto tectónico. El análisis del tensor del momento sísmico puede distinguir entre diferentes fuentes sísmicas como colapsos y terremotos.
Área de la Ciencia:
- La geofísica es la geofísica.
- Sismología Sismología.
Sus antecedentes:
- Los eventos sísmicos pueden originarse de varias fuentes, incluyendo terremotos tectónicos y colapsos subterráneos.
- Distinguir entre estas fuentes es crucial para la evaluación y el monitoreo del peligro sísmico.
Objetivo del estudio:
- Para analizar el patrón de radiación sísmica de un evento de magnitud 3.9 en el centro de Utah.
- Para determinar el mecanismo de origen del evento sísmico.
- Evaluar la utilidad del análisis del tensor del momento sísmico para la discriminación del tipo de fuente.
Principales métodos:
- Análisis de sismogramas de un evento sísmico de magnitud 3.9.
- Modelado del evento sísmico utilizando el análisis del tensor del momento sísmico.
- Comparación de los resultados del tensor de momento sísmico con los de explosiones nucleares conocidas, colapsos mineros y terremotos tectónicos.
Principales resultados:
- El evento sísmico exhibió un patrón de radiación anómalo dominado por un componente implosivo, inconsistente con los terremotos tectónicos.
- El evento se modela mejor como un colapso subterráneo poco profundo.
- Se identificó un componente de fuente más pequeño y no colapsado, potencialmente relacionado con fallas o deformación del medio circundante.
- Se observaron distintas poblaciones de resultados tensores de momento sísmico para diferentes tipos de fuentes.
Conclusiones:
- El tensor de momento sísmico es una herramienta valiosa para discriminar entre los tipos de fuentes sísmicas, incluidos los colapsos subterráneos y los terremotos tectónicos.
- El evento analizado probablemente fue causado por un colapso subterráneo poco profundo, posiblemente con fallas menores asociadas.
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