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  Landslides on Ceres: Inferences Into Ice Content and Layering in the Upper Crust

Chilton, H. T., Schmidt, B. E., Duarte, K., Ferrier, K. L., Hughson, K. H. G., Scully, J. E. C., et al. (2019). Landslides on Ceres: Inferences Into Ice Content and Layering in the Upper Crust. Journal of Geophysical Research: Planets, 124(6), 1512-1524. doi:10.1029/2018JE005634.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0006-5C37-6 Version Permalink: http://hdl.handle.net/21.11116/0000-0006-5C38-5
Genre: Journal Article

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 Creators:
Chilton, H. T., Author
Schmidt, B. E., Author
Duarte, K., Author
Ferrier, K. L., Author
Hughson, K. H. G., Author
Scully, J. E. C., Author
Wray, J. J., Author
Sizemore, H. G., Author
Nathues, Andreas1, Author              
Platz, Thomas1, Author              
Schorghofer, N., Author
Schenk, P. M., Author
Landis, M. E., Author
Bland, M., Author
Byrne, S., Author
Russell, C. T. R., Author
Raymond, C. A., Author
Affiliations:
1Department Planets and Comets, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832288              

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 Abstract: We analyze landslides on Ceres using several quantitative approaches to constrain the composition and structure of the top few kilometers of Ceres' crust. We focus on a subset of archetypal landslides classified morphologically as thick, steep‐snouted “type 1” (T1) flows and thin spatulate “type 2” (T2) flows (Schmidt et al., 2017, https://doi.org/10.1038/ngeo2936) to explore the landslides' mechanical properties. Our results confirm earlier observations showing that T1 landslides are typically found poleward of 70° latitude and T2 mostly equatorward of 70° latitude. Measurements of landslide drop height and runout length imply effective friction coefficients lower than common friction coefficients in any of Ceres' identified or suggested non‐ice surface materials, including saturated clays. Our measurements of the volume and area of landslide scars suggest that T1 landslides can fail to greater depths than T2 for a given scar area, consistent with depth‐limited failure in T2 landslides. These results are consistent with a layer of lower shear strength material overlying a stronger layer in Ceres' outer shell at low to middle latitudes and a single layer without an overlying weak layer at polar latitudes. Combining these observations with known constraints on Ceres' near‐surface composition, we propose that Ceres' crust at low to middle latitudes consists of a topmost layer with an ice content in excess of the spectral and elemental detection depths, thins out at high latitudes, and overlies a stronger and more ice‐rich layer.

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Language(s): eng - English
 Dates: 2019
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1029/2018JE005634
 Degree: -

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Title: Journal of Geophysical Research: Planets
  Other : JGR-E
  Abbreviation : J. Geophys. Res. - E
Source Genre: Journal
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Affiliations:
Publ. Info: Washington, D.C. : American Geophysical Union
Pages: - Volume / Issue: 124 (6) Sequence Number: - Start / End Page: 1512 - 1524 Identifier: ISSN: 2169-9100
CoNE: https://pure.mpg.de/cone/journals/resource/2169-9100