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Evidencia de grandes terremotos del Holoceno a lo largo de la costa exterior del estado de Washington
Science (New York, N.Y.)
|May 22, 1987
Resumen
El hundimiento tectónico y los tsunamis han impactado repetidamente en las tierras bajas del oeste de Washington durante más de 7000 años. La evidencia sugiere que estos eventos fueron causados por grandes terremotos en la zona de subducción.
Área de la Ciencia:
- Geología Geología Geología.
- Sismología Sismología.
- Paleoecología Paleoecología.
Sus antecedentes:
- Las tierras bajas del oeste de Washington han experimentado repetidos eventos de entierro.
- La evidencia sugiere que estos eventos están relacionados con la actividad geológica.
Objetivo del estudio:
- Para investigar la frecuencia y las causas de los eventos de entierro de tierras bajas en el oeste de Washington.
- Para determinar la relación entre el hundimiento, los tsunamis y la actividad tectónica.
Principales métodos:
- Análisis de los registros geológicos de la deposición de lodo entre mareas.
- Identificación de las capas de arena indicativas de tsunamis.
- Correlación de los eventos geológicos con las fuentes sísmicas potenciales.
Principales resultados:
- Al menos seis eventos de entierro ocurrieron en los últimos 7000 años.
- Cada entierro fue probablemente causado por un hundimiento tectónico de 0.5 a 2.0 metros.
- Las hojas de arena sugieren tsunamis acompañados por al menos tres eventos de hundimiento.
Conclusiones:
- Los eventos de hundimiento y tsunami están relacionados con grandes terremotos.
- La zona de subducción de Cascadia es la fuente probable de estos eventos sísmicos.
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