Christof Sager

csager

Fachbereich Geowissenschaften

Institut für Geologische Wissenschaften

Tektonik und Sedimentäre Systeme

M.Sc.Student

Adresse Malteserstr.74-100
Raum B 242
12249 Berlin
Telefon (+49 30) 838 - 70190
Fax (+49 30) 838 - 458659
E-Mail christofs@zedat.fu-berlin.de

2014 – present

M.Sc. Geological Sciences (Geodynamics and Geomaterials) at Freie Universität Berlin

Thesis: Seismicity-driven movement of boulders in the hyper-arid Atacama Desert
Advisors: Dr. Alessandro Airo, Prof. Dr. Anne Bernhardt

M.Sc. Project in Chile

We study the movement and patterning of boulders in the hyper-arid core of the Atacama Desert, Chile. Since the sedimentary transport of boulders under non-fluvial conditions on Earth is rare and poorly understood, the aim of this study is to investigate the general processes causing boulder patterning. Aerial photography data was collected with a DJI Phantom 3 drone. Based on this data 3D Models and Digital Elevation Models (DEM) were generated for analyzing the geomorphic features and surface pattern typical to these sedimentary settings.

   

Figure 1

Figure 1: Agisoft Photoscan is a software that performs photogrammetric processing of digital images and generates 3D spatial data, that will be used for this study in GIS applications. Here an orthomosaic (left) generated from more than 500 digital photos and a DEM (right) of a studied field site is shown (http://www.agisoft.com/).

   

Figure 2: Fieldwork was conducted in two field sessions (2016 & 1017) in the Atacama Desert, Chile.  For the generation of 3D models, a DJI Phantom 3 was used in the field.
  

2011 – 2014

B.Sc. in Geological Sciences at Freie Universität Berlin

Thesis: Biomats in a simulated tidal system

Advisors: Dr. Alessandro Airo, Prof. Dr. Anna Gorbushina

 

Conference abstract:

EANA2016 (webpage)/AbGradE symposium (webpage): 16th European Astrobiology Conference, 
27-30 September 2016, Athens, Greece

Seismically-driven boulder-transport in the hyper-arid Atacama Desert as an analog for processes on Mars

In contrast to Earth, where sedimentary transport of boulders under non-fluvial conditions is rare and poorly understood, on today’s hyper-arid Mars they are of global relevance. The transport and clustering of boulders on Mars has been hypothesized to be driven by alternative  processes: (1) gravitational slumping, (2) dry cryoturbation, (3) frost heave, or (4) seasonal freezing and sublimation of dry ice. For better understanding such transport mechanisms on Mars we studied analogous settings on Earth and investigated the movement and patterning of boulders in the hyper-arid core of the Atacama Desert, Chile. Our results show that earthquake-driven gravitational processes are the main driving force for boulders moving downslope and their spatial arrangement having various boulder densities, orientations and patterns. While on Earth sedimentary transport is dominated by fluvial processes, with the exception of hyper-arid regions, on today’s Mars seismicity-driven transport might represent a major mechanism for shaping its global geomorphology.