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El deslizamiento lento periódico desencadena terremotos de la zona megatrust en el noreste de Japón
Naoki Uchida1, Takeshi Iinuma2, Robert M Nadeau3
1Graduate School of Science and International Research Institute of Disaster Science, Tohoku University, 6-6, Aramaki-aza-aoba, Aoba-ku, Sendai 980-8578, Japan.
Science (New York, N.Y.)
|January 30, 2016
Resumen
Eventos casi periódicos de deslizamiento lento en Japón
Área de la Ciencia:
- La geofísica
- Tectónica
- Sismología
Sus antecedentes:
- Las fallas del límite de la placa se adaptan al movimiento relativo a través del deslizamiento sísmico y asísmico.
- En el noreste de Japón, el deslizamiento sísmico incluye el deslizamiento posterior y el deslizamiento constante en áreas de empuje de subducción no acopladas.
Objetivo del estudio:
- Para informar sobre un comportamiento de deslizamiento lento cuasi-periódico recién identificado en la zona megathrust.
- Para investigar la relación entre los eventos de deslizamiento lento y los grandes terremotos.
Principales métodos:
- Análisis de datos geológicos para identificar eventos de deslizamiento lento.
- Correlación del tiempo del evento de deslizamiento lento con la actividad sísmica.
Principales resultados:
- Se identificó un comportamiento de deslizamiento lento cuasi periódico generalizado y no reconocido previamente en la zona de megatrust.
- Los eventos de deslizamiento lento se repiten cada 1 a 6 años.
- Estos eventos a menudo coinciden con o preceden a grupos de grandes terremotos (M ≥ 5), incluido el terremoto de Tohoku-oki M 9 de 2011.
Conclusiones:
- Es probable que los eventos periódicos de deslizamiento lento causen cambios periódicos de estrés.
- Los eventos de deslizamiento lento modulan el tiempo de los terremotos más grandes.
- La periodicidad del deslizamiento lento puede mejorar el pronóstico de terremotos dependientes del tiempo.
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