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Elevación abrupta en los últimos 1700 años en el sur de Puget Sound, Washington
Science (New York, N.Y.)
|December 4, 1992
Resumen
El sur de Puget Sound experimentó una rápida elevación de las costas de hasta 7 metros hace 500-1700 años. Este evento geológico, vinculado al deslizamiento de fallas, indica potencial de terremotos en la región.
Área de la Ciencia:
- Geología Geología Geología.
- Sismología Sismología Sismología.
- La paleogeografía es la paleogeografía.
Sus antecedentes:
- Las costas en el sur de Puget Sound y el Canal Hood muestran evidencia de un significativo movimiento vertical de la tierra.
- Estudios anteriores no han detallado completamente el momento y la extensión de estos cambios en la línea costera en el pasado.
Objetivo del estudio:
- Para investigar el momento, la magnitud y la causa de la rápida elevación de la costa en la región de Puget Sound.
- Para evaluar el potencial de peligro sísmico asociado con la actividad geológica en esta área.
Principales métodos:
- Análisis de plataformas elevadas de corte de olas en la costa cerca de Seattle.
- Examen de las zonas de mareas emergentes cubiertas de turba hasta 60 km al suroeste de la zona de elevación.
- Correlación de los eventos de elevación con la actividad de falla inferida.
Principales resultados:
- Las costas se elevaron hasta 7 metros entre hace 500 y 1700 años.
- La evidencia sugiere un levantamiento abrupto, evitando la formación de costas intermedias y alterando los planos de marea a los entornos de agua dulce.
- La mayor elevación coincidió con el deslizamiento de falla inversa inferido cerca de Seattle hace 1000-1100 años.
Conclusiones:
- La corteza del Puget Sound posee el potencial de dañar los terremotos.
- Los eventos de elevación rápida y el deslizamiento de fallas asociado son peligros geológicos confirmados en la región.
- Comprender la actividad sísmica pasada es crucial para evaluar los riesgos futuros de terremotos.
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