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Surface Processes on Vesta – Impact Cratering and Impact Related Mass Movements

Krohn, Katrin (2014) Surface Processes on Vesta – Impact Cratering and Impact Related Mass Movements. Dissertation.

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Abstract

This work covers the dominant resurfacing processes on asteroid Vesta. The main focus is the analysis of exogenous processes on slopes, such as meteorite impacts and mass movements. The basic input for the analysis are high-resolution images and topographic maps obtained from scientific data of the DAWN spacecraft. A detailed geologic-morphologic mapping of two quadrangles shows that Vesta´s surface is affected by impact craters and different types of mass movement features, such as intra-crater mass wasting, rotational slumping blocks, landslides and gullies. Over-steepened crater rims, formed by the impact itself, cause slope instabilities and promote gravity-forced material to move down the crater wall. Due to the low gravity, impact-induced seismic shaking is the most likely trigger for mass movements on Vesta. In addition, the topography causes many craters to be formed on slopes. These impact craters have an asymmetric shape with a sharp rim on the uphill side and a smooth rim on the downhill side. Geologic and geomorphologic mapping, numerical simulations as well as age determinations show that in most cases, the slope prevents the deposition of ejected material above the uphill rim. In combination with the mass wasting material of the initial slope, a smooth downhill rim is the result of this formation process. Thus, asymmetric craters are the result of a specific form of mass wasting. This thesis shows that mass wasting is the key process for the formation of the morphology on Vesta.

Item URL in elib:https://elib.dlr.de/93463/
Document Type:Thesis (Dissertation)
Title:Surface Processes on Vesta – Impact Cratering and Impact Related Mass Movements
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Krohn, Katrinkatrin.krohn (at) dlr.dehttps://orcid.org/0000-0001-8518-4985
Date:November 2014
Journal or Publication Title:DLR-Forschungsbericht 2014-30
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Number of Pages:170
Status:Published
Keywords:Asteroid Vesta, geology, geomorphology, asymmetric craters, resurfacing
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Science and Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Erforschung des Weltraums
DLR - Research theme (Project):R - Projekt DAWN
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Geology
Deposited By: Krohn, Dr.rer.nat Katrin
Deposited On:15 Dec 2014 10:36
Last Modified:01 Dec 2018 19:50

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