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Fases pn de alta frecuencia observadas en el Pacífico a grandes distancias
Science (New York, N.Y.)
|July 15, 1977
Resumen
Las observaciones de guías de ondas sísmicas en el noroeste del Pacífico revelan dos zonas de velocidad distintas. Las ondas sísmicas más rápidas viajan a 30 grados, mientras que las ondas más lentas se extienden más, lo que indica estructuras complejas del manto.
Área de la Ciencia:
- La geofísica es la geofísica.
- Sismología Sismología Sismología.
- Ciencias de la Tierra Ciencias de la Tierra
Sus antecedentes:
- Las guías de ondas sísmicas son cruciales para comprender la estructura profunda de la Tierra.
- Estudios anteriores habían identificado una guía de ondas en el noroeste del Pacífico.
Objetivo del estudio:
- Para investigar la propagación de ondas sísmicas en el noroeste del Pacífico.
- Para caracterizar las estructuras de velocidad sísmica a mayores distancias.
Principales métodos:
- Análisis de los tiempos de viaje de las ondas sísmicas.
- Interpretación de las anomalías de la velocidad sísmica.
Principales resultados:
- Se confirmó una guía de ondas sísmica con 8,3 km/s de velocidad a ~30 grados.
- Se identificó una guía de onda secundaria, más lenta (7,8 km/s) que se extiende más allá de los 30 grados.
Conclusiones:
- El noroeste del Pacífico exhibe complejas estructuras de velocidad sísmica.
- Las guías de ondas sísmicas más profundas sugieren una intrincada dinámica del manto.
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