Estimating Europa's internal structure with ambient noise

Details Estimating Europa's internal structure with ambient noise Estimating Europa's internal structure with ambient noise

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002asaj..111.2372l&link_type=abstract

Acoustical Society of America Journal, Volume 111, Issue 5, pp. 2372-2372 (2002).

Computer Science

Sound

Scientific paper

Jupiter's moon, Europa, is believed to possess a vast liquid ocean beneath a thin ice surface, although the thickness of the ice shell and depth of the ocean still remain poorly constrained. The authors have previously discussed the possibility of using ambient noise to probe Europa's interior [Makris et al., Eos. Trans. Am. Geophys. Union 82(47), P22B-0552 (2001)]. Here the analysis is refined and extended. The probability density for high source level or ``big bang'' events from tidally induced surface cracks and meteor impacts is estimated. Such events are important because they are most likely to have returns from internal Europan strata that stand above the ambient noise level. Travel-time curves for various thicknesses are also presented and used to demonstrate that echo-sounding and tomographic techniques can be applied to estimate thickness of the ice layer, depth of the ocean, and internal temperature structure. Convective ice can also be detected by spectral analysis of surface waves, since significant contrast in shear wave speed is expected in the partial-melt-ice regime. Spectral analysis is also applied to analyze flexural modes of a thin ice shell, to estimate ice-shell thickness, and to potentially study the sediment layer on the seafloor.

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