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Altas tasas de movimiento de la corteza vertical cerca de Ventura, California
Science (New York, N.Y.)
|April 15, 1977
Resumen
Las rocas sedimentarias marinas revelan que la cuenca de Ventura se hundió rápidamente hasta hace 0,6 millones de años. Desde entonces, su margen norte ha aumentado en 10 mm / año, comparable a las tasas geodésicas, pero menor que la falla de San Andrés.
Área de la Ciencia:
- Geología Geología Geología.
- La geofísica es la geofísica.
- La tectónica es la tectónica.
Sus antecedentes:
- La historia geológica y la actividad tectónica de la cuenca de Ventura son cruciales para comprender la dinámica de la corteza regional.
- Estudios anteriores han proporcionado datos cuantitativos limitados sobre las tasas de desplazamiento vertical en escalas de tiempo largas.
Objetivo del estudio:
- Para cuantificar las tasas de desplazamiento vertical en la cuenca de Ventura en los últimos 2 millones de años.
- Para comparar el movimiento vertical cuaternario con mediciones geodésicas recientes y otros sistemas de fallas importantes.
Principales métodos:
- Datamiento de la pista de fisión de las rocas sedimentarias marinas.
- Las técnicas de datación radiométrica.
- Análisis paleomagnético para establecer restricciones de edad.
Principales resultados:
- La cuenca de Ventura experimentó un hundimiento significativo a tasas de hasta 9.5 ± 2.5 mm / año hasta hace aproximadamente 0.6 millones de años.
- El hundimiento cesó hace unos 0,6 millones de años, seguido de la elevación del margen norte de la cuenca.
- El margen norte ha estado aumentando a una tasa promedio de 10 ± 2 mm / año desde hace 0,6 millones de años.
Conclusiones:
- El cese del hundimiento y la subsiguiente elevación indican un cambio importante en el régimen tectónico de la cuenca de Ventura.
- Las recientes tasas de elevación son consistentes con los datos geodésicos, pero significativamente más bajas que las observadas a lo largo de la falla de San Andrés.
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