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Geometría tridimensional de la falla de esparcimiento y implicaciones para la generación de tsunamis
G F Moore1, N L Bangs, A Taira
1Center for Deep Earth Exploration, Japan Agency for Marine Earth Science and Technology, 3173-25 Showamachi Kanazawa-ku, Yokohama, Japan. gmoore@jamstec.go.jp
Science (New York, N.Y.)
|November 17, 2007
Resumen
Las fallas de Megasplay, cruciales para la génesis del tsunami, fueron fotografiadas en 3D a lo largo del canal de Nankai. Su geometría empinada indica un papel importante en la generación de devastadores tsunamis históricos.
Área de la Ciencia:
- La geofísica es la geofísica.
- La tectónica es la tectónica.
- Geología marina Geología marina.
Sus antecedentes:
- Las fallas Megasplay son fallas de largo empuje que se originan en zonas de subducción.
- Se supone que estas fallas contribuyen a la generación de tsunamis.
- Comprender su geometría es clave para evaluar el riesgo de tsunamis.
Objetivo del estudio:
- Para obtener imágenes y mapear la geometría y la continuidad de un sistema de empuje megasplay.
- Para investigar la actividad y la evolución de las fallas de megasplay.
- Para evaluar el papel de las fallas de megasplay en la génesis de los tsunamis.
Principales métodos:
- Imágenes sísmicas tridimensionales del sistema de empuje del megasplay.
- Mapeo de la geometría de la falla y la continuidad lateral.
- Analizando la geometría del empuje y la evidencia de la caída de sedimentos.
Principales resultados:
- El sistema de fallas megasplay fue fotografiado en 3D, mostrando la continuidad desde el límite de la placa hasta el fondo marino.
- Se observaron evidencias de actividad y evolución de la falla hacia tierra.
- La geometría de la falla muestra un empinamiento progresivo, lo que aumenta el potencial de elevación del fondo marino.
Conclusiones:
- El deslizamiento de fallas de Megasplay probablemente contribuyó a tsunamis históricos, como el evento de Tonankai de 1944.
- La geometría específica de esta falla megasplay aumenta el potencial de generación de tsunamis.
- Este margen y entornos similares son muy susceptibles a los tsunamis debido a las características de falla megasplay.
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