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Desbordamiento dinámico superficial y ruptura profunda energética en el terremoto de 2011 Mw 9.0 Tohoku-Oki terremoto
Satoshi Ide1, Annemarie Baltay, Gregory C Beroza
1Department of Earth and Planetary Science, University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-0033, Japan. ide@eps.s.u-tokyo.ac.jp
Science (New York, N.Y.)
|May 21, 2011
Resumen
El terremoto de 2011 en el Tohoku-Oki.
Área de la Ciencia:
- La geofísica es la geofísica.
- Sismología Sismología Sismología.
- La tectónica es la tectónica.
Sus antecedentes:
- El terremoto de Tohoku-Oki de 2011 (magnitud del momento 9.0) causó una devastación generalizada.
- Comprender sus características de ruptura es crucial para la evaluación del peligro sísmico.
Objetivo del estudio:
- Para analizar las características de ruptura espacial y temporal del terremoto de Tohoku-Oki.
- Para investigar la relación entre el comportamiento de la ruptura, el temblor del suelo y la generación de tsunamis.
Principales métodos:
- Se emplearon técnicas de imágenes de fuente finita.
- Análisis de las formas de onda sísmica y distribución de las réplicas.
Principales resultados:
- La ruptura exhibió una variación espacial significativa, con distintas fases profundas y poco profundas.
- Se produjo un gran deslizamiento poco profundo cerca de la zanja, posiblemente debido a la geometría de la falla y el cumplimiento de la pared colgante.
- Las réplicas de fallas normales indicaron un exceso dinámico en áreas de alto deslizamiento.
- La radiación de alta frecuencia fue más fuerte en las zonas de ruptura más profundas que en las superficiales.
Conclusiones:
- Las variaciones espaciales en las características de ruptura influyeron directamente en la intensidad de las sacudidas y el tamaño del tsunami.
- La geometría de las fallas y las propiedades de las paredes colgantes jugaron un papel en permitir grandes deslizamientos poco profundos.
- La dinámica de ruptura del terremoto proporciona información sobre el comportamiento de los terremotos de megatrust y la radiación de ondas sísmicas.
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