Processes that shaped the ridges and troughs on the surface of Jupiter's icy moon Ganymede are likely similar to tectonic processes seen on Earth, according to a team of researchers led by Southwest Research Institute (SwRI). To arrive at this conclusion, the team subjected physical models made of clay to stretching forces that simulate tectonic action. The results were published in Geophysical Research Letters.
Physical analog models simulate geologic structures in laboratory settings so that the developmental sequence of various phenomena can be studied as they occur.
Left Image: Courtesy of Southwest Research Institute;
Right Image: Courtesy of NASA/JPL SSI image s0552443639
An image of a tabletop-size analog model (left) shows details of fault systems created by extension that visually match an image by spacecraft Galileo of faulted terrain on Ganymede (right).
The team – including researchers from SwRI, Wheaton College, NASA's Jet Propulsion Laboratory and NuStar Energy LP – created complex patterns of faults in their models, similar to the ridge and trough features seen in some regions of Ganymede. The models consisted of a “wet clay cake” material possessing brittle characteristics to simulate how the icy moon’s lithosphere, the outermost solid shell, responds to stresses by cracking.
The laboratory models suggest that characteristic patterns of ridges and troughs, called grooved terrain on Ganymede, result from its surface being stretched. “The physical models showed a marked similarity to the surface features observed on Ganymede,” said co-author Dr. Danielle Wyrick, a senior research scientist in the SwRI Space Science and Engineering Division.
“From the experiments, it appears that a process in which the crust breaks into separate blocks by large amounts of extension is the primary mechanism for creating these distinct features.”
“Physical analog modeling allows us to simulate the formation of complex three-dimensional geologic structures on Ganymede, without actually going to Ganymede,” said co-author Dr. David Ferrill, director of the Earth, Material and Planetary Sciences Department in the SwRI Geosciences and Engineering Division.
“These scaled models are able to reproduce the fine geometric details of geologic processes, such as faulting, and to develop and test hypotheses for landscape evolution on planetary bodies.”
SwRI researchers previously have used physical analog models to examine the process by which pit crater chains — a series of linear pits, or depressions — develop on Mars, and how magma in the Martian subsurface deforms the surface of the Red Planet.
NASA’s Outer Planets Research Program supported this work. The paper, “Physical models of grooved terrain tectonics on Ganymede,” by D.W. Sims, D.Y. Wyrick, D.A. Ferrill, A.P. Morris, G.C. Collins, R.T. Pappalardo and S.L. Colton, was published by Geophysical Research Letters, 16 June 2014, Volume 41, Issue 11, pages 3774–3778 , (doi 10.1002/2014GL060359).
Editors: An image is available at http://www.swri.org/press/2014/ganymede.htm.
For more information, contact Joe Fohn, (210) 522-4630, or Maria Martinez Stothoff, (210) 522-3305, Communications Department, Southwest Research Institute, PO Drawer 28510, San Antonio, TX 78228-0510
Maria Martinez Stothoff | Eurek Alert!
Streamlining accelerated computing for industry
24.08.2016 | DOE/Oak Ridge National Laboratory
Lehigh engineer discovers a high-speed nano-avalanche
24.08.2016 | Lehigh University
Scientists and engineers striving to create the next machine-age marvel--whether it be a more aerodynamic rocket, a faster race car, or a higher-efficiency jet...
Waveguides are widely used for filtering, confining, guiding, coupling or splitting beams of visible light. However, creating waveguides that could do the same for X-rays has posed tremendous challenges in fabrication, so they are still only in an early stage of development.
In the latest issue of Acta Crystallographica Section A: Foundations and Advances , Sarah Hoffmann-Urlaub and Tim Salditt report the fabrication and testing of...
Electrochemists at TU Graz have managed to use monocrystalline semiconductor silicon as an active storage electrode in lithium batteries. This enables an integrated power supply to be made for microchips with a rechargeable battery.
Small electrical gadgets, such as mobile phones, tablets or notebooks, are indispensable accompaniments of everyday life. Integrated circuits in the interiors...
Recent findings indicating the possible discovery of a previously unknown subatomic particle may be evidence of a fifth fundamental force of nature, according...
A nanocrystalline material that rapidly makes white light out of blue light has been developed by KAUST researchers.
25.08.2016 | Event News
24.08.2016 | Event News
12.08.2016 | Event News
25.08.2016 | Power and Electrical Engineering
25.08.2016 | Health and Medicine
25.08.2016 | Information Technology