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Una amplia distribución de profundidad de temblores sísmicos a lo largo del margen norte de Cascadia
Honn Kao1, Shao-Ju Shan, Herb Dragert
1Geological Survey of Canada, Pacific Geoscience Centre, 9860 West Saanich Road, Sidney, British Columbia V8L 1B9, Canada. hkao@nrcan.gc.ca
Nature
|August 12, 2005
Resumen
Los temblores de la zona de subducción de Cascadia ocurren episódicamente en un rango de profundidad de 40 km. Estos eventos sísmicos sugieren la participación de fluidos y pueden indicar un deslizamiento transitorio o un deslizamiento episódico difuso a lo largo de la interfaz de la placa.
Área de la Ciencia:
- Ciencias de la Tierra Ciencias de la Tierra
- Sismología Sismología.
- La geofísica es la geofísica.
Sus antecedentes:
- La zona de subducción de Cascadia es capaz de generar grandes terremotos (M(w) = 9) debido a su interfaz de placa marina bloqueada.
- Los desplazamientos superficiales episódicos con firmas sísmicas similares a temblores ocurren aproximadamente cada 14 meses, opuestos a la deformación a largo plazo.
Objetivo del estudio:
- Investigar la distribución espacial y las características de los eventos sísmicos similares a temblores en la zona de subducción de Cascadia.
- Comprender los mecanismos subyacentes y las implicaciones de estos fenómenos sísmicos episódicos.
Principales métodos:
- Análisis de datos geodésicos para inferir el comportamiento de la interfaz de placas.
- Análisis de datos sísmicos para caracterizar la distribución y profundidad del temblor.
- Correlación de las ubicaciones de los temblores con los reflectores sísmicos y la interfaz de placa.
Principales resultados:
- Los temblores se distribuyen en un rango de profundidad superior a 40 km dentro de una estrecha banda horizontal.
- Muchos temblores ocurren cerca de fuertes reflectores sísmicos por encima de la interfaz de la placa, un área que carece de terremotos locales.
- El proceso sismógeno para los temblores parece estar relacionado con los fluidos.
Conclusiones:
- El rango de profundidad observado de los temblores sugiere una asociación con las variaciones del campo de tensión inducidas por el deslizamiento transitorio en la interfaz de placa de Cascadia más profunda.
- Alternativamente, los hallazgos pueden indicar que el deslizamiento episódico es más difuso de lo que se suponía anteriormente.
- Comprender estas fuentes de temblores es crucial para evaluar los peligros sísmicos en la región de Cascadia.
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