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Viscosidad de la astenosfera oceánica inferida de la activación remota de los terremotos
Pollitz1, Burgmann, Romanowicz
1F. F. Pollitz and R. Burgmann, Department of Geology, University of California, Davis, Davis, CA 95616, USA. B. Romanowicz, University of California Seismological Laboratory, 475 McCone Hall, Berkeley, CA 94720, USA.
Science (New York, N.Y.)
|June 5, 1998
Resumen
Los grandes terremotos a lo largo del límite de la placa del Pacífico entre 1952-1965 influyeron en la actividad sísmica a nivel mundial. Los cambios de estrés postsísmicos desencadenaron terremotos intraplate y alteraron los patrones de sismicidad en todo el mundo.
Área de la Ciencia:
- La geofísica es la geofísica.
- Sismología Sismología Sismología.
- La tectónica de placas es la tectónica de placas.
Sus antecedentes:
- Una serie de grandes terremotos de interplacas ocurrieron a lo largo del arco de las Aleutianas y la zanja Kurile-Kamchatka de 1952 a 1965.
- Estos eventos liberaron el estrés acumulado a través de una parte significativa del límite de la placa del Pacífico norte.
Objetivo del estudio:
- Para investigar la evolución del estrés postsísmico después de esta secuencia de terremotos importantes.
- Para determinar la influencia de estos cambios de tensión en la actividad sísmica posterior.
Principales métodos:
- Utilizó un modelo de acoplamiento viscoelástico para simular cambios de tensión.
- Incorporó una viscosidad astenosférica de 5 x 10^17 segundos pascales en el modelo.
- Analizó las mediciones geodésicas basadas en el espacio de las anomalías de velocidad.
Principales resultados:
- La evolución del estrés postsísmico calculada es consistente con los patrones sísmicos observados.
- El modelo explica el desencadenamiento de los terremotos oceánicos intraplate.
- También explica los patrones de sismicidad temporal en los límites remotos de las placas.
- Se observaron velocidades anómalas en un área de 7000 x 7000 km durante 30 años después de la secuencia.
Conclusiones:
- La secuencia de terremotos de 1952-1965 impactó significativamente en la distribución de las tensiones a través de la placa del Pacífico.
- La relajación del estrés postsísmico jugó un papel crucial en el desencadenamiento de terremotos posteriores e influir en la sismicidad global.
- Los hallazgos destacan la interconexión de los límites de las placas tectónicas.
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