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Updated: Sep 18, 2025
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Migración de deslizamiento lento y poco profundo en la Nankai Trough megathrust capturado por los observatorios de
Joshua R Edgington1, Demian M Saffer1, Charles A Williams2
1University of Texas Institute for Geophysics, Austin, TX, USA.
Science (New York, N.Y.)
|June 26, 2025
Resumen
Los estudios de la zona de subducción en alta mar revelan eventos de deslizamiento lento (SSEs) que migran hacia el mar hacia la zanja. La alta presión del fluido poroso y el bajo estrés en la región de la fuente de SSE proporcionan evidencia que vincula estos factores con los terremotos lentos de poca profundidad.
Área de la Ciencia:
- La geofísica
- Tectónica
- Sismología
Sus antecedentes:
- Comprender la acumulación y liberación de tensiones en las zonas de subducción es crucial para evaluar el deslizamiento de poca profundidad y el potencial de tsunami.
- Los patrones marinos de estos procesos siguen siendo poco conocidos.
Objetivo del estudio:
- Para analizar historias detalladas de tiempo de deslizamiento de eventos de deslizamiento lento (SSE) en la zona de subducción de Nankai.
- Investigar la relación entre la presión del fluido poroso, el estrés y las SSE superficiales.
Principales métodos:
- Análisis de los registros de presión porosa de formación de tres observatorios de perforación en alta mar.
- Seguimiento de inicio de deslizamiento, migración y fenómenos sísmicos asociados.
Principales resultados:
- Se documentaron dos SSE, iniciando ~ 30 km hacia la tierra de la zanja y migrando hacia el mar a 1-2 km / día.
- El deslizamiento alcanzó a pocos kilómetros de la zanja, posiblemente rompiéndola, y coincidió con temblores de muy baja frecuencia.
- La región de la fuente SSE exhibió una alta presión de fluido poroso y una baja tensión.
Conclusiones:
- Proporciona evidencia observacional que vincula la alta presión del fluido poroso y el bajo estrés con los terremotos lentos de poca profundidad.
- Demuestra que las SSE pueden propagarse a las partes más superficiales del límite de la placa.
- Destaca la importancia del seguimiento en alta mar para la dinámica de la zona de subducción.
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