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Pruebas sísmicas de subplatación activa por debajo de la zona de terremotos megatrust en Japón
Hisanori Kimura1, Tetsuya Takeda, Kazushige Obara
1National Research Institute for Earth Science and Disaster Prevention (NIED), 3-1 Tennodai, Tsukuba, Ibaraki 305-0006, Japan. kimura@bosai.go.jp
Science (New York, N.Y.)
|July 10, 2010
Resumen
Los repetidos micro-terremotos revelan una capa subterránea activa en las zonas de subducción. Esta actividad sísmica ocurre a lo largo de la interfaz de desprendimiento de la placa del Mar de Filipinas, ofreciendo información sobre la generación de terremotos de megathrust.
Área de la Ciencia:
- La geofísica es la geofísica.
- Sismología Sismología.
- La tectónica es la tectónica.
Sus antecedentes:
- La estructura de la zona de subducción es crucial para comprender los fenómenos de interplacas como los terremotos de megathrust.
- Se infiere una zona de subducción profunda, donde una losa se pela y se acumula, pero carece de evidencia sísmica directa.
Objetivo del estudio:
- Para proporcionar pruebas sísmicas directas de la zona de subducción profunda subplatación.
- Investigar la relación entre la actividad de micro-terremotos y los procesos de subplatación.
Principales métodos:
- Comparación de perfiles de reflexión sísmica con las distribuciones de micro-terremotos en el centro de Japón.
- Análisis de la repetición de micro-terremotos a lo largo de las interfaces de las placas.
Principales resultados:
- Se identificaron micro-terremotos repetidos a lo largo de la interfaz inferior de una capa de desprendimiento de la placa subductora del Mar de Filipinas.
- Esta zona sísmicamente activa se correlaciona con la ubicación de los eventos de deslizamiento lento.
Conclusiones:
- Se ha establecido evidencia sísmica directa de subplatación activa.
- Los repetidos micro-terremotos y eventos de deslizamiento lento pueden servir como señales de monitoreo para los procesos activos de subplatación en las zonas de subducción.
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