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Controls on the Global Distribution of Martian Landsliding

Roback, Kevin P. and Ehlmann, Bethany L. (2020) Controls on the Global Distribution of Martian Landsliding. . (Unpublished) https://resolver.caltech.edu/CaltechAUTHORS:20201026-101616800

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Abstract

Recent acquisition of high-resolution satellite imagery of the Martian surface has permitted landsliding to be studied on a global scale on Mars for the first time. We apply the Scoops3D software package to compute slope stability for select regions of the Martian surface, combining calculations of slope stability with number of observed landslides, as reported in a recently published (Crosta et al., 2018a, b) inventory of Martian landslides, to understand controls on the global distribution of landsliding on Mars. We find that the distribution of landsliding does not simply follow the distribution of unstable slopes. In particular, there is an increase in landsliding in the Tharsis Rise area, and especially in Valles Marineris and Noctis Labyrinthus, that is not explained by an abundance of unstable topography alone. We analyzed for but did not find a clear local lithologic or stratigraphic control on landslide occurrence from subsurface heterogeneities. Other possibilities to explain the increased occurrence of landslides in the Tharsis Rise include (1) regionally widespread Tharsis weak unit(s), such as from interbedded ashes and lavas; (2) seismic activity related to the Tharsis Rise’s geological activity, and (3) possible groundwater near Valles Marineris into the Amazonian. Given the apparently young ages of many landslide deposits in Valles Marineris (Quantin et al., 2004), continued modern day analysis of lithologies in Valles Marineris and observations of Martian seismicity may act to strengthen or rebut the first two hypotheses.


Item Type:Report or Paper (Discussion Paper)
Related URLs:
URLURL TypeDescription
https://doi.org/10.1002/essoar.10504190.1DOIDiscussion Paper
https://doi.org/10.22002/D1.1617DOIData
ORCID:
AuthorORCID
Roback, Kevin P.0000-0001-5209-2873
Ehlmann, Bethany L.0000-0002-2745-3240
Additional Information:License: Attribution-NonCommercial 4.0 International. Published Online: Thu, 10 Sep 2020. We thank Giovanni Crosta and Paolo Frattini for both providing early access to their Martian landslide inventory prior to its publication, and providing early feedback and critique of this work. We also thank Martin Knapmeyer for providing us with access to his mapped inventory of Martian faults. We also thank Jay Dickson for help in compiling and processing the Mars datasets. Our dataset of slope-stability calculations generated for this work is publically archived at CaltechDATA; doi: 10.22002/D1.1617.
Record Number:CaltechAUTHORS:20201026-101616800
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20201026-101616800
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:106276
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:26 Oct 2020 17:41
Last Modified:26 Oct 2020 17:41

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