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Modelo de inestabilidad de ablandamiento por deformación para el terremoto de San Fernando
Resumen
Los cambios en la elevación del suelo cerca del terremoto de San Fernando de 1971 se alinean con un modelo de rocas de falla que se ablandan por deformación. Esto sugiere que las tasas de deslizamiento de fallas aumentaron significativamente antes del evento sísmico.
Área de la Ciencia:
- La geofísica es la geofísica.
- Sismología Sismología.
- Ciencia de los terremotos Ciencia de los terremotos Ciencia de los terremotos Ciencia de los terremotos
Sus antecedentes:
- El terremoto de San Fernando de 1971 causó una importante deformación del suelo.
- Comprender el comportamiento de las fallas antes de un terremoto es crucial para la evaluación del riesgo sísmico.
Objetivo del estudio:
- Para investigar el comportamiento mecánico de las rocas de la zona de fallas antes del terremoto de San Fernando de 1971.
- Evaluar la consistencia de los cambios de elevación del suelo observados con modelos teóricos de terremotos.
Principales métodos:
- Análisis de datos geodésicos que miden los cambios de elevación del suelo antes y después del terremoto de 1971.
- Comparación de la deformación observada con las predicciones de un modelo teórico de ablandamiento por deformación para rocas de falla.
Principales resultados:
- Los cambios de elevación del suelo observados son consistentes con un modelo teórico.
- El modelo indica que las rocas de la zona de falla experimentaron un ablandamiento de la deformación después de alcanzar el pico de tensión.
- La tasa implícita de deslizamiento de fallas antes del terremoto cerca del foco alcanzó aproximadamente 0,1 metros por año.
Conclusiones:
- La deformación del terremoto de San Fernando de 1971 se explica por un modelo de roca de falla que suaviza la deformación.
- El aumento de las tasas de deslizamiento de fallas precedió al terremoto, consistente con el modelo propuesto.
- Este estudio mejora la comprensión de la mecánica de los terremotos y los fenómenos precursores.
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