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Modeling of Landslides in Valles Marineris, Mars, and Implications for Initiation Mechanism

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Tsige Aza, Meaza and Ruiz Pérez, Javier and Río, Ian A. del and Jiménez Díaz, Alberto (2016) Modeling of Landslides in Valles Marineris, Mars, and Implications for Initiation Mechanism. Earth Moon Planets, 118 (1). pp. 15-26. ISSN 0167-9295

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Official URL: https://link.springer.com/article/10.1007%2Fs11038-016-9488-z



Abstract

The Valles Marineris canyon system in Mars shows large landslides across its walls, which can be 40 km wide and up to 60 km long, with fall scarps height as high as 7 km. These landslides were produced through a large mass movement at high speed by gravity across the trough floor. Although the triggering factors are unclear, several mechanisms have been proposed as, among others, large amounts of subsurface water, quake produced through normal faulting close to the canyon walls, and meteoritic impacts. In this work we examine the limit equilibrium slope stability of three landslides (placed respectively at Ius, Candor, and Melas Chasmata), which can be considered representative, with the aims of constraining their formation conditions. Our results suggest that external factors (as high pore fluid pressure, seismic loading or rock mass disturbance) do not seem necessary for the failure of slopes if they are composed of unconsolidated materials, while high pore water pressure or ground acceleration are needed to trigger slides in slopes composed of strong basaltic-like materials. Moreover, the presence of sub-surface ice would contribute to slope stability. As a whole, our findings point to ground shaking due to meteorite impacts as the main triggering force for most landslides in the Valles Marineris.


Item Type:Article
Uncontrolled Keywords:Landslides, Modeling
Subjects:Sciences > Geology
Sciences > Geology > Geodynamics
ID Code:43497
Deposited On:02 Aug 2017 07:22
Last Modified:02 Aug 2017 08:13

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