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El temblor no volcánico impulsado por grandes tensiones de cizallamiento transitorias.
Justin L Rubinstein1, John E Vidale, Joan Gomberg
1Department of Earth and Space Science, University of Washington, Box 351310, Seattle, Washington, 98195, USA. justin@ess.washington.edu
Nature
|August 3, 2007
Resumen
Los temblores no volcánicos cerca de las zonas de subducción pueden ser provocados por ondas sísmicas de terremotos distantes. Esto sugiere que los eventos de temblor y deslizamiento lento son causados por el rápido aumento de la tensión de cizallamiento en la interfaz de la placa.
Área de la Ciencia:
- La geofísica es la geofísica.
- Sismología Sismología Sismología.
- Tectonofísica es la física de las tectonas.
Sus antecedentes:
- La radiación sísmica no impulsiva, o temblor, se observa en los volcanes y las zonas de subducción.
- La causa exacta del temblor no volcánico sigue sin estar clara, con el movimiento del fluido y el deslizamiento de la interfaz de la placa como hipótesis principales.
- Estudios previos en Japón vincularon el temblor a los terremotos de baja frecuencia y el deslizamiento de corte en la interfaz de subducción.
Objetivo del estudio:
- Para investigar la causa del temblor no volcánico en la zona de subducción de Cascadia.
- Para determinar si los eventos sísmicos externos pueden desencadenar temblores.
- Comprender la relación entre el temblor, los eventos de deslizamiento lento y las tensiones de la interfaz de la placa.
Principales métodos:
- Análisis de los datos de temblores sísmicos de la zona de subducción de Cascadia.
- Correlación de las ráfagas de temblores con las llegadas de ondas sísmicas del terremoto de 2002 en Denali, Alaska.
- Cálculo de las tensiones de cizallamiento en la interfaz de la placa basada en los desplazamientos de las ondas de Love.
Principales resultados:
- Explosiones de temblores identificadas en Cascadia provocadas por las ondas de amor del terremoto de Denali.
- El temblor se produjo durante desplazamientos específicos de ondas de amor, lo que indica un mecanismo de activación.
- Las tensiones de corte calculadas de aproximadamente 40 kPa, lo que sugiere una tensión efectiva muy baja en la interfaz de la placa.
Conclusiones:
- El temblor y los eventos de deslizamiento potencialmente lento pueden ser inducidos instantáneamente por el aumento de la tensión de corte en la interfaz de subducción.
- Este fenómeno representa una respuesta de falla por fricción al aumento del estrés de conducción.
- Los hallazgos desafían los modelos existentes y resaltan la sensibilidad de las zonas de subducción a las tensiones externas.
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