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Modulación de las mareas del temblor no volcánico
Justin L Rubinstein1, Mario La Rocca, John E Vidale
1Department of Earth and Space Science, University of Washington, Box 351310, Seattle, WA 98195, USA. justin@ess.washington.edu
Science (New York, N.Y.)
|November 24, 2007
Resumen
Los temblores no volcánicos y los eventos de deslizamiento lento en la zona de subducción de Cascadia están influenciados por las fuerzas de marea. Estos eventos sísmicos ocurren en fallas muy débiles, a diferencia de los terremotos normales.
Área de la Ciencia:
- La geofísica es la geofísica.
- Sismología Sismología Sismología.
- La tectónica es la tectónica.
Sus antecedentes:
- Los temblores no volcánicos y los eventos de deslizamiento lento se observan en zonas de subducción como Japón y Cascadia.
- Estos eventos difieren de los típicos terremotos en su origen y propiedades de escala.
- Los episodios recientes en la región de Puget Sound / sur de la isla de Vancouver de Cascadia fueron bien registrados.
Objetivo del estudio:
- Para investigar la relación entre las fuerzas de las mareas y los temblores no volcánicos / eventos de deslizamiento lento.
- Para comprender los factores que controlan la génesis del temblor en la zona de subducción de Cascadia.
Principales métodos:
- Análisis de datos sísmicos de episodios recientes de temblores en la zona de subducción de Cascadia.
- Comparación de los períodos de pulsación del temblor con los principales ciclos de mareas lunares y lunisolares.
Principales resultados:
- La actividad de temblores exhibió pulsaciones claras con períodos que coincidían con las mareas lunares (12,4 horas) y lunisolares (24-25 horas).
- Las tensiones de las mareas influyen significativamente en la génesis del temblor más que los terremotos normales.
- Las tensiones litostáticas son órdenes de magnitud mayores que las tensiones de marea.
Conclusiones:
- La fuerte correlación sugiere que las tensiones de marea desencadenan efectivamente temblores no volcánicos.
- Es probable que el temblor se inicie en fallas extremadamente débiles, ya que son sensibles a las pequeñas tensiones de marea.
- Este hallazgo proporciona información sobre la mecánica de los eventos de deslizamiento lento y el comportamiento de falla en las zonas de subducción.
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