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Prevalencia global de las zonas dobles de Benioff
Michael R Brudzinski1, Clifford H Thurber, Bradley R Hacker
1Geology Department, Miami University, Oxford, OH 45056, USA. brudzimr@muohio.edu
Science (New York, N.Y.)
|June 9, 2007
Resumen
Las zonas de doble Benioff, que indican dos capas de terremotos profundos, son inherentes a las placas de subducción. Su separación aumenta con la edad de la placa, lo que sugiere que la deshidratación de la antigorita es la causa probable.
Área de la Ciencia:
- Sismología Sismología.
- La tectónica es la tectónica.
- La geofísica es la geofísica.
Sus antecedentes:
- Las zonas de doble Benioff, caracterizadas por dos capas distintas de terremotos profundos, presentan un rompecabezas para comprender la sismogénesis.
- Explicar el mecanismo detrás de estas capas sísmicas dobles y su separación es crucial para avanzar en nuestro conocimiento de la dinámica de la zona de subducción.
Objetivo del estudio:
- Para caracterizar la separación de capas dentro de las placas de subducción utilizando datos de sismicidad.
- Investigar la ocurrencia global y los factores de control de las zonas dobles de Benioff.
Principales métodos:
- Utilizó la rotación de coordenadas para analizar la distribución normal de los terremotos.
- Empleó catálogos de sismicidad global para cuantificar la separación de capas.
- Realizó pruebas de referencia en ejemplos conocidos para validar la metodología.
Principales resultados:
- Separación de capas cuantificada con precisión utilizando sólo catálogos de sismicidad global.
- Se han identificado zonas dobles de Benioff en 30 segmentos de zonas de subducción a nivel mundial.
- Se observó que la separación de capas aumenta con la edad de la placa subductora.
Conclusiones:
- Las zonas de doble Benioff son una característica común, inherente a las placas de subducción a través de varias edades y condiciones de estrés.
- El aumento observado en la separación de capas con la edad apoya la deshidratación de la antigorita como un mecanismo más plausible que la deshidratación del clorito.
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