R. Pappalardo

Publications448
h-index54
Citations8,172
Highly Influential Citations449
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Tectonic Processes on Europa: Tidal Stresses, Mechanical Response, and Visible Features
Abstract Europa's orbital eccentricity, driven by the resonance with Io and Ganymede, results in “diurnal” tides (3.5-day period) and possibly in nonsynchronous rotation. Both diurnal variation and…
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Shear heating as the origin of the plumes and heat flux on Enceladus
TLDR
It is shown that the most likely explanation for the heat and vapour production is shear heating by tidally driven lateral (strike-slip) fault motion with displacement of ∼0.5 m over a tidal period, suggesting that the ice shell is decoupled from the silicate interior by a subsurface ocean.
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Evidence for a subsurface ocean on Europa
TLDR
High-resolution Galileo spacecraft images of Europa are presented, in which evidence for mobile ‘icebergs’ is found and the detailed morphology of the terrain strongly supports the presence of liquid water at shallow depths below the surface, either today or at some time in the past.
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Modeling stresses on satellites due to nonsynchronous rotation and orbital eccentricity using gravitational potential theory
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Diapir-induced reorientation of Saturn's moon Enceladus
TLDR
This work shows that the current polar location of the hotspot of Enceladus can be explained by reorientation of the satellite's rotation axis because of the presence of a low-density diapir, and predicts that the distribution of impact craters on the surface will not show the usual leading hemisphere–trailing hemisphere asymmetry.
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Geology of Ganymede
Geological evidence for solid-state convection in Europa's ice shell
TLDR
The morphology and geological interpretation of distinct surface features—pits, domes and spots—discovered in high-resolution images of Europa obtained by the Galileo spacecraft are reported, finding that the formation of the features can be explained by thermally induced solid-state convection within an ice shell, possibly overlying a liquid water layer.
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Evaluation of models for the formation of chaotic terrain on Europa
Chaotic terrain on Europa is interpreted to be the result of the breakup of brittle surface materials over a mobile substrate. Two end-member models have been proposed for the mobile substrate: a…
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Does Europa have a subsurface ocean? Evaluation of the geological evidence
It has been proposed that Jupiter's satellite Europa currently possesses a global subsurface ocean of liquid water. Galileo gravity data verify that the satellite is differentiated into an outer H2O…
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Ocean worlds in the outer solar system
Many outer solar system bodies are thought to harbor liquid water oceans beneath their ice shells. This article first reviews how such oceans are detected. We then discuss how they are maintained,…
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