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Evidencia de un remanente a gran escala de la litosfera subducida debajo de Fiji

W P Chen¹, M R Brudzinski

¹Department of Geology, University of Illinois, Urbana, IL 61801, USA. w-chen@uiuc.edu

Science (New York, N.Y.)

|June 30, 2001

Resumen

Los terremotos profundos debajo del arco posterior de Tonga se explican por una losa separada que interactúa con la zona Wadati-Benioff. Esta interacción puede preservar el material primordial del manto.

Área de la Ciencia:

La geofísica es la geofísica.
Sismología Sismología.
La tectónica es la tectónica.

Sus antecedentes:

El arco trasero de Tonga exhibe un complejo patrón de sismicidad y de fallas.
Comprender la dinámica de la litosfera subducida es crucial para los estudios de la evolución del manto.

Objetivo del estudio:

Investigar la naturaleza de la litosfera subducida y los terremotos profundos debajo del arco posterior de Tonga.
Explicar patrones sísmicos desconcertantes utilizando datos geofísicos.

Principales métodos:

Análisis combinado de las velocidades de ondas P y S.
Utilizado 1000 soluciones de plano de falla.
Incorporó 6600 hipocentros bien determinados.

Principales resultados:

Identificación de la yuxtaposición de una empinada zona Wadati-Benioff y una losa subhorizontal separada.
La losa separada es potencialmente del fósil de la zanja de Vitiaz (hace 5-8 millones de años).
Esta configuración atrapa material subducido en la zona de transición del manto.

Conclusiones:

El modelo de la losa separada explica la sismicidad observada y las soluciones del plano de falla.
Este proceso podría conducir a la preservación del material primordial en el manto inferior.
Sugiere que tales configuraciones de losas pueden ser comunes, impactando en la composición temprana del manto de la Tierra.

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