dione’s history of tectonic disruption · 2017-02-22 · dione’s history of tectonic disruption...

Dione’s History of Tectonic Disruption

Emily S. Martin D. Alex Patthoff

Jessica McDaniel Thomas R. Watters

Presenter

Presentation Notes

I want to share with you preliminary results from work I did with one of our interns, Jessica McDaniel to understand the nature and origin of the wispy terrain.

Cassini

Motivation*

Voyager

Motivations & Approach What caused the pulse of tectonic activity driving the formation of the wispy terrains?

1) Characterize the morphology and distribution of tectonic and linear structures in the wispy

terrains of the trailing hemisphere 2) Use mapped fracture patterns to compare with theoretical stress models to constrain

possible stress mechanisms

Voyager

Presenter

Presentation Notes

And to I want to show you some preliminary results. And put this work in a larger context. Compare the eccentricities Enceladus is .0047 and dione is .0022, Europa is .01

N1507748228 20 km

50 km N1662198128 N1662197108

Characterization: Recent

Scar

ps

“Tw

in S

carp

s”

Characterization: Ancient

Ridges Trough Scarp

Preliminary Modeling Results Build a Dione using previously published rheological estimates using SatStressGUI (Patthoff et al., 2016) Consider fracturing when magnitudes reach 1-2 MPa Diurnal Tidal Stress Nonsynchronous Rotation (10ky, 100ky, 1My, 10My) Ice Shell Thickening

(Not to scale!)

333km

50km

175km

3km

dione’s history of tectonic disruption · 2017-02-22 · dione’s history of tectonic disruption...

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