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Terremotos provocados por eventos de deslizamiento silencioso en el volcán Kīlauea, Hawai
Paul Segall1, Emily K Desmarais, David Shelly
1Geophysics Department, Stanford University, Stanford, California 94305, USA.
Nature
|July 11, 2006
Resumen
Los terremotos de alta frecuencia que acompañan a los eventos de deslizamiento lento en el volcán Kīlauea sugieren actividad sísmica desencadenada. Este hallazgo ayuda a limitar la profundidad de los terremotos silenciosos y a evaluar los peligros asociados.
Área de la Ciencia:
- La geofísica es la geofísica.
- Sismología Sismología Sismología.
- Volcanología Volcanología.
Sus antecedentes:
- Los eventos de deslizamiento lento, o 'terremotos silenciosos', ocurren en zonas de subducción, pero sus profundidades son difíciles de determinar.
- La asociación con terremotos de alta frecuencia, fácilmente localizados, ha sido rara, lo que dificulta la restricción de profundidad.
- El temblor no volcánico a veces acompaña a un deslizamiento lento, pero es difícil de localizar con precisión.
Objetivo del estudio:
- Para investigar la relación entre los eventos de deslizamiento lento y los terremotos de alta frecuencia.
- Para determinar la profundidad de los eventos de deslizamiento lento mediante el análisis de la sismicidad que los acompaña.
- Comprender los mecanismos de activación y los peligros potenciales asociados con los eventos de deslizamiento lento.
Principales métodos:
- Análisis de enjambres de terremotos que acompañan a los eventos de deslizamiento lento en el volcán Kīlauea.
- Correlación de la actividad sísmica con la progresión de eventos de deslizamiento lento, particularmente el evento de enero de 2005.
- Aplicación de los principios de cambio de tensión de Coulomb para inferir el desencadenamiento de terremotos.
Principales resultados:
- Se observaron enjambres de terremotos de alta frecuencia para acompañar deslizamientos lentos en Kīlauea.
- El evento de deslizamiento lento de enero de 2005 precedió a un aumento en la sismicidad, lo que indica que se desencadenaron terremotos.
- Los terremotos a 7-8 km de profundidad limitaron el deslizamiento lento a profundidades comparables.
Conclusiones:
- Los terremotos de alta frecuencia pueden ser desencadenados por eventos de deslizamiento lento, proporcionando restricciones de profundidad.
- La detección de la sismicidad desencadenada es crucial para comprender las profundidades y los peligros de los eventos de deslizamiento lento.
- Esta asociación ofrece un método potencial para cuantificar el aumento del riesgo sísmico durante eventos de deslizamiento lento.
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