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Flujo del manto debajo de una falla de deslizamiento continental: deformación postsísmica después del terremoto de la
F F Pollitz1, C Wicks, W Thatcher
1U.S. Geological Survey, 345 Middlefield Road, MS 977, Menlo Park, CA 94025, USA.
Science (New York, N.Y.)
|September 8, 2001
Resumen
Grandes terremotos en el estado de California.
Área de la Ciencia:
- * Geofísica y tectónica.
- * Sismología y Geodesia.
Sus antecedentes:
- * Los terremotos de 1992 Landers (Mw 7.3) y 1999 Hector Mine (Mw 7.1) en el desierto de Mojave en California causaron una deformación significativa de la corteza.
- * Los datos geodésicos postsísmicos revelaron patrones inesperados, incluidas las velocidades horizontales en descomposición y la elevación del cuadrante.
Objetivo del estudio:
- * Para investigar la causa de la deformación acelerada de la corteza terrestre después de grandes terremotos.
- * Comprender el papel de la dinámica del manto superior en el ciclo sísmico.
Principales métodos:
- * Análisis de datos geodésicos (por ejemplo, mediciones GPS) recopilados después del terremoto de la mina Hector.
- * Interpretación de los patrones de deformación en el contexto de los modelos de flujo del manto.
Principales resultados:
- * La deformación postsísmica observada se atribuye al vigoroso flujo del manto superior que responde a los cambios de tensión inducidos por el terremoto.
- * La corteza inferior actúa como una guía de tensión, vinculando los procesos de la corteza superior a la dinámica del manto superior.
Conclusiones:
- * El flujo del manto transitorio es un factor crítico en el ciclo sísmico.
- * La corteza inferior juega un papel crucial en la transmisión de la tensión entre la corteza superior y el manto.
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