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Restricciones geodésicas del fondo marino en el acoplamiento de placas de la zona de megatrust de Nankai Trough
Yusuke Yokota1, Tadashi Ishikawa1, Shun-ichi Watanabe1
1Hydrographic and Oceanographic Department, Japan Coast Guard, 3-1-1, Kasumigaseki, Chiyoda-ku, Tokyo 100-8932, Japan.
Nature
|June 10, 2016
Resumen
Los nuevos datos del fondo marino revelan distribuciones críticas de la tasa de déficit de deslizamiento (SDR) en la cañada de Nankai. Estos hallazgos mejoran la comprensión del potencial de terremotos y tsunamis en esta región sísmicamente activa.
Área de la Ciencia:
- * Geofísica
- * Sismología
- * Tectónica
Sus antecedentes:
- * Los terremotos de megatrust interplacas representan riesgos sociales significativos, con un evento importante pronosticado para el cañón de Nankai.
- * La comprensión de las tasas de déficit de deslizamiento (DEG) es crucial para la predicción de terremotos, pero han faltado datos marinos.
- * Los estudios anteriores carecían de una visión completa de las regiones de origen de los terremotos debido a la insuficiencia de datos geodésicos del fondo marino.
Objetivo del estudio:
- * Presentar nuevos datos de observación geodésica del fondo marino y un modelo de distribución de DEG entre placas marinas para el canal de Nankai.
- * Identificar regiones previamente desconocidas de DEG altos y bajos para mejorar las estrategias de mitigación de desastres por tsunamis.
- * Investigar la relación entre las condiciones de acoplamiento y los fenómenos sísmicos/geológicos.
Principales métodos:
- * Desarrollo de una red de observación geodésica precisa y sostenible del fondo marino por parte de la Guardia Costera de Japón (JHOD).
- * Recopilación y análisis de datos geodésicos marinos en la zona de subducción de Nankai Trough.
- * Modelado de las distribuciones de la tasa de deslizamiento entre placas basado en los datos recogidos del fondo marino.
Principales resultados:
- * La mayoría de las regiones marinas dentro de la zona de subducción de Nankai Trough exhiben DEG positivos.
- * Identificación de regiones de alto DEG no reconocidas anteriormente que son cruciales para la mitigación de desastres por tsunamis.
- * Descubrimiento de regiones bajas de SDR que se correlacionan con terremotos lentos de poca profundidad y subducción de montañas submarinas.
Conclusiones:
- * Este estudio proporciona la primera evidencia directa que vincula las condiciones de acoplamiento a los fenómenos sísmicos y geológicos observados.
- * Los hallazgos ofrecen información vital para inferir escenarios de terremotos de gran magnitud en el valle de Nankai.
- * La investigación mejora la interpretación de los estudios en curso en la zona de subducción de Nankai Trough.
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