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Una ley de escala para terremotos lentos
Satoshi Ide1, Gregory C Beroza, David R Shelly
1Department of Earth and Planetary Science, University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-0033, Japan. ide@eps.s.u-tokyo.ac.jp
Nature
|May 4, 2007
Resumen
Eventos sísmicos inusuales como temblores y deslizamientos lentos están unificados por una nueva ley de escala. Este hallazgo revela que son una categoría de terremotos distinta, que difiere de los terremotos regulares.
Área de la Ciencia:
- Sismología Sismología Sismología.
- Ciencia de los terremotos Ciencia de los terremotos Ciencia de los terremotos Ciencia de los terremotos
- La geofísica es la geofísica.
Sus antecedentes:
- Los descubrimientos recientes incluyen temblores episódicos profundos, terremotos de baja frecuencia, terremotos de muy baja frecuencia, eventos de deslizamiento lento y terremotos silenciosos.
- Estos fenómenos surgen del deslizamiento de cizallamiento, similar a los terremotos regulares, pero tienen duraciones más largas y emiten menos energía sísmica.
Objetivo del estudio:
- Para demostrar una relación de escala unificada para varios eventos sísmicos lentos.
- Para diferenciar el comportamiento de los eventos sísmicos lentos de los terremotos regulares.
- Establecer una nueva categoría para estos fenómenos sísmicos unificados.
Principales métodos:
- Análisis del momento sísmico y la duración característica.
- Examen de la función de la velocidad de momento y la desintegración espectral de alta frecuencia.
- Investigando la dependencia de escala de la velocidad de ruptura.
Principales resultados:
- Los eventos sísmicos lentos siguen una relación de escala unificada: el momento sísmico es proporcional a la duración característica.
- Su función de velocidad de momento es constante con una desintegración espectral de alta frecuencia de f ((-1)).
- Este comportamiento los distingue de los terremotos regulares y sugiere que son diferentes manifestaciones del mismo fenómeno.
Conclusiones:
- Se propone una nueva categoría de terremotos que abarca diversos eventos sísmicos lentos.
- Las leyes de escala observadas pueden explicarse por una caída constante de baja tensión o por un modelo difusional de deslizamiento constante.
- Esta ley de escala unificada puede mejorar la comprensión de la subducción de placas y la generación de grandes terremotos.
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