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Deformación en fallas cercanas inducidas por el terremoto de la mina Hector de 1999
Yuri Fialko1, David Sandwell, Duncan Agnew
1Institute of Geophysics and Planetary Physics, Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA 92093, USA. fialko@radar.ucsd.edu
Science (New York, N.Y.)
|September 14, 2002
Resumen
El radar de apertura sintética interferométrica (ISAR) reveló el movimiento de la falla durante el terremoto de la mina Hector de 1999. Las zonas de falla mostraron propiedades mecánicas distintas, respondiendo elásticamente a los cambios de estrés sísmico.
Área de la Ciencia:
- La geofísica es la geofísica.
- La tectónica es la tectónica.
- La detección remota con sensores.
Sus antecedentes:
- El terremoto de la mina Héctor de 1999 causó una deformación significativa de la superficie.
- Comprender el comportamiento de las fallas durante los eventos sísmicos es crucial para la evaluación de los riesgos sísmicos.
Objetivo del estudio:
- Para analizar los patrones de deformación de la superficie asociados con el terremoto de la mina de Héctor de 1999 utilizando el radar de apertura sintética interferométrica (ISAR).
- Para investigar las propiedades mecánicas de las zonas de falla dentro de la zona de cizallamiento del este de California.
Principales métodos:
- Utilizó el radar de apertura sintética interferométrica (ISAR) para observar los desplazamientos de la superficie.
- Analizó el movimiento vertical y horizontal a través de zonas de fallas de un kilómetro de ancho.
Principales resultados:
- Se observaron desplazamientos de milímetro a centímetro en múltiples fallas cerca de la ruptura principal.
- Movimiento retrógrado documentado en algunas secciones de fallas, opuesto al deslizamiento geológico a largo plazo.
- Se deduce una disminución del módulo de cizallamiento efectivo dentro de las zonas de falla, lo que sugiere que son mecánicamente distintos de la corteza circundante.
Conclusiones:
- Las zonas de falla exhiben un comportamiento compatible, respondiendo de manera elástica a los cambios de estrés co-sísmico.
- Los desplazamientos observados indican que las zonas de falla son estructuras mecánicamente únicas en comparación con la corteza ambiental.
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