In my previous post, I mentioned the impact crater located on Mars. In this post, I will be talking about analyzing its morphology with software widely used by foundation engineers. This impact craters morphology is categorized as PPR (Peripheral Peak Ring). PPRs occur on craters having a diameter between 4 and 200 km when instabilities occur on the rim causing a crater deformation and a part of the rim to detach and slide into the crater. In the Department of Geoscience at the University of Calgary, there was a study to create a model for PPRS targeted to describe, characterize it. Jason Nycz, who was doing the research for this project, inversely modeled and analyzed the formation as a transversal block slide in Slide2 using the topographic inputs from DEM (Digital Elevation Models) and reasonable rock parameters. This research supplied much information about the strength parameters for the uppermost layers of the Martian crust. The model is created conditions and constraints (position, height, and shape of the crater) Three Phases of Modelling:
1. Modelling the crater before the PPR was formed.
2. Detachment of the PPR from the crater rim, sliding laterally and downward toward the crater center. The result is an intermediate step in the formation of the PPR.
3. Transform the intermediate profile into the observed one.
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| Initial input model in Slide2 |
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| Slide2 model imported to RS2 |
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| Finite element analysis results in RS2 |
References:
https://www.rocscience.com/documents/pdfs/rocnews/fall2011/Slope-Failure-Impact-Crater-on-Mars.pdf
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