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Formación de las características cicloidales en Europa
G V Hoppa1, B R Tufts, R Greenberg
1Lunar and Planetary Laboratory, 1629 East University Boulevard, University of Arizona, Tucson, AZ 85721-0092, USA. hoppa@lpl.arizona.edu
Science (New York, N.Y.)
|September 18, 1999
Resumen
Los patrones cicloidales en Europa pueden ser causados por las grietas de las capas de hielo que se forman diariamente debido a las tensiones de las mareas. Esto requiere baja resistencia a la tracción del hielo y un océano subterráneo para una flexión de marea significativa.
Área de la Ciencia:
- Ciencias planetarias Ciencias planetarias.
- La geofísica es la geofísica.
- Geología Geología Geología.
Sus antecedentes:
- Los patrones cicloidales son frecuentes en la luna de Júpiter Europa.
- Estos patrones sugieren procesos geológicos relacionados con el estrés y la fractura.
Objetivo del estudio:
- Para investigar el mecanismo de formación de patrones cicloidales en la superficie helada de Europa.
- Determinar las condiciones físicas necesarias para que se desarrollen dichos patrones.
Principales métodos:
- Modelación de la propagación de grietas bajo variaciones diurnas de la tensión de las mareas.
- Analizar el papel de la resistencia a la tracción de las capas de hielo y las capas de fluidos subterráneos.
Principales resultados:
- Los patrones cicloidales pueden formarse a partir de grietas de tracción que se propagan en respuesta a los ciclos diurnos de tensión de las mareas.
- La propagación de las grietas sigue trayectorias de curvatura dictadas por el cambiante campo de tensión.
- Cada segmento arqueado corresponde a la propagación de grietas durante un día europeo.
Conclusiones:
- La resistencia a la tracción de la corteza de hielo de Europa debe ser inferior a 40 kilopascales para este modelo.
- Una capa de fluido sustancial debajo del hielo es necesaria para facilitar la amplitud de marea requerida para la formación de grietas.
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