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Migración de dispersores sísmicos asociados con el evento transitorio aseísmico de Parkfield de 1993
Fenglin Niu1, Paul G Silver, Robert M Nadeau
1Department of Earth Science, MS-126, Rice University, 6100 Main Street, Houston, Texas 77005, USA. niu@rice.edu
Nature
|December 5, 2003
Resumen
Los científicos observaron cambios en las estructuras de la zona de fallas utilizando datos sísmicos de repetidos micro-terremotos. Estos cambios, vinculados a transitorios asísmicos, sugieren una redistribución de fluidos dentro de las fracturas a aproximadamente 3 km de profundidad.
Área de la Ciencia:
- La geofísica es la geofísica.
- Sismología Sismología Sismología.
- Ciencia de los terremotos Ciencia de los terremotos Ciencia de los terremotos Ciencia de los terremotos
Sus antecedentes:
- Comprender la dinámica de la zona de fallas es crucial para la predicción de terremotos.
- La detección de la deformación variable en el tiempo a profundidades sísmicas ha sido un desafío.
- Los estudios de laboratorio sugieren detectabilidad sísmica de los cambios estructurales en las fracturas de la corteza.
Objetivo del estudio:
- Proporcionar evidencia de cambios estructurales observables dentro de las zonas de falla.
- Para investigar las variaciones temporales en los sismogramas de repetidos micro-terremotos.
- Para correlacionar el movimiento de dispersión sísmica con eventos de deformación aseísmica.
Principales métodos:
- Análisis de sismogramas de repetidos micro terremotos en la Falla de San Andrés (1987-1997). análisis de sismogramas de repetidos micro terremotos en la Falla de San Andrés (1987-1997). análisis de sismogramas de repetidos micro terremotos en la Falla de San Andrés (1987-1997). análisis de sismogramas de repetidos micro terremotos en la Falla de San Andrés (1987-1997).
- Localización de los difusores sísmicos dentro de la zona de falla.
- Comparación del movimiento de dispersión con transitorios aseísmicos documentados.
Principales resultados:
- Se observaron variaciones temporales sistemáticas en los sismogramas de micro-terremotos.
- Se detectó un desplazamiento de aproximadamente 10 metros en ubicaciones más dispersas a una profundidad de ~ 3 km.
- El movimiento de dispersión coincidió espacial y temporalmente con un evento transitorio asísmico.
Conclusiones:
- Los cambios estructurales dentro de las zonas de falla son observables sísmicamente.
- El movimiento de dispersión observado probablemente sea el resultado de la redistribución de fluidos inducida por el estrés en las fracturas.
- Estos hallazgos mejoran nuestra comprensión del comportamiento de las fallas y los procesos sísmicos.
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