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Extensión, duración y velocidad del terremoto de Sumatra-Andamán de 2004 fotografiado por la matriz Hi-Net

Miaki Ishii¹, Peter M Shearer, Heidi Houston

¹Institute of Geophysics and Planetary Physics, Scripps Institution of Oceanography, IGPP 0225, University of California San Diego, La Jolla, California 92093, USA. mishii@ucsd.edu

|May 24, 2005

Resumen

Los científicos desarrollaron un nuevo método para obtener imágenes de la progresión de la ruptura de un terremoto casi en tiempo real. Este análisis reveló el terremoto de Sumatra-Andamán de 2004.

Área de la Ciencia:

Sismología de terremotos sismología de terremotos.
La geofísica es la geofísica.
La tectónica es la tectónica.

Sus antecedentes:

El terremoto de Sumatra-Andamán de 2004 fue un evento sísmico importante con un potencial destructivo significativo.
La estimación precisa de la magnitud del terremoto y las características de ruptura es crucial para comprender los peligros sísmicos.
Las estimaciones previas de magnitud para este evento variaron, destacando la necesidad de mejorar las técnicas de análisis.

Objetivo del estudio:

Introducir un nuevo método para la obtención directa de imágenes de ruptura de terremotos.
Para determinar la evolución espacio-temporal de la ruptura del terremoto de 2004 en Sumatra y Andamán.
Para refinar la estimación de la magnitud del momento y las características de ruptura de este gran terremoto.

Principales métodos:

Utilizó la matriz sísmica Hi-Net en Japón como una antena de gran apertura.
Empleó ondas de compresión de primera llegada para monitorear la dirección de la radiación de alta frecuencia.
Desarrolló una técnica para la obtención de imágenes directas de la progresión de la ruptura del terremoto dentro de los 30 minutos de la iniciación.

Principales resultados:

La ruptura se propagó hacia el norte a través de toda la zona de réplicas de 1.300 km.
Se determinó que la velocidad de ruptura era de aproximadamente 2.8 km/s durante una duración de 8 minutos.
Se confirmó una magnitud de momento de aproximadamente 9.3 para el terremoto de Sumatra-Andamán.
Identificó la ruptura como la más larga jamás registrada, tanto en duración como en extensión.

Conclusiones:

El nuevo método de obtención de imágenes proporciona información rápida y detallada sobre la dinámica de ruptura de un terremoto.
Las características de ruptura del terremoto de Sumatra-Andamán se alinean con una magnitud de momento de 9.3.
Este evento representa una escala de ruptura sin precedentes en la historia sísmica registrada.

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