1,843 Works

Sandsteine im In-situ-Geothermielabor Groß Schönebeck: Reservoircharakterisierung, Stimulation, Hydraulik und Nutzungskonzepte

Ernst Huenges & Markus Wolfgramm
Scientific Technical Report STR ; 04/03

A high resolution global gravity field model combining CHAMP and GRACE satellite mission and surface data: EIGEN-CG01C

Christoph Reigber, P. Schwintzer, Richard Stubenvoll, R. Schmidt, Frank Flechtner, U. Meyer, Rolf König, Karl-Hans Neumayer, Christoph Förste, Franz Barthelmes, S. Y. Zhu, G. Balmino, Richard Biancale, J.-M. Lemoine, H. Meixner & Jean-Claude Raimondo
Scientific Technical Report STR ; 06/07

Retrieval of earthquake source parameters in inhomogeneous anisotropic media with application to swarm events in West Bohemia in 2000

Dirk Rößler
In der vorliegenden Arbeit werden der Einfluss seismischer Anisotropie auf wahre oder scheinbar auftretende tensile Quellanteile untersucht und Erdbebenmechanismen unter Berücksichtigung seismischer Anisotropie bestimmt. Es wird gezeigt, dass derMomententensor und die Abstrahlmuster eines Scherbruches im anisotropen Mediumdenen eines tensilen Bruches im isotropen Medium ähneln können. Umgekehrt tretenÄhnlichkeiten tensiler Beben in anisotropen Gesteinen mit Scherbrüchen in isotropenMedien auf. Damit existieren Mehrdeutigkeiten beobachteter tensiler Quellanteile. DieEffekte von Anisotropie hängen von der Orientierung des Bruches und vom Grad...

Thermomechanical polythermal ice-sheet model

Ondřej Souček
Based on the physical processes governing the motion and dynamics of poly-thermal ice sheets, we distinguish two regions; the cold region, where the ice temperatureis below the melting point, and the temperate region, where the ice temperature is exactly equal to the melting point, leading to the presence of a water fraction. This work focuses on the analysis and description of the temperate zone on the basis of rational thermo-dynamics of reacting mixtures. The balance...

Neogene seismotectonics of the south-central Chile margin : subduction-related processes over various temporal and spatial scales

Daniel Melnick
This study focuses on tectonics at the Neogene and late Quaternary time scales in the Main Cordillera and coastal forearc of the south-central Andes. For both domains I document the existence of previously unrecognized active faults and present estimates of deformation rates and fault kinematics. Furthermore these data are correlated to address fundamental mountain building processes like strain partitioning and largescale segmentation.

Theory of elastic waves

Michael Weber, Georg Rümpker, Dirk Gajewski & Gerhard Müller

Zur Bestimmung des cm-Geoids und dessen zeitlicher Variationen mit GRACE

Roland Schmidt

Microfacies and isotope analyses of the varved Piànico lake sediment profile for high-resolution reconstruction of interglacial climate dynamics

Clara Mangili
Understanding the climate system and the natural processes that lead to its changes is fundamental when trying to evaluate and assess the human influence on climate variability. Human activities characterised most of the Holocene time period, so that palaeoclimate sequences of the last 8,000 years recorded both climate change and human impact. In order to study natural climate variability, we have to investigate past interglacial climate records, when human impact was none.Amongst many palaeoclimate archives,...

Interpretation glazial-isostatischer Ausgleichsvorgänge im Südosten Islands unter Berücksichtigung des Island-Plumes

Oliver Hartmann, Wolfgang R. Jacoby, Detlef Wolf, Volker Klemann & Ingo Sasgen
Der glazial-isostatische Ausgleich in Island infolge des rezenten Abschmelzens der Vatnajökull-Eiskappe wird durch die Viskositätsverteilung im Erdinnern und durch die Details der Abschmelzgeschichte kontrolliert. Interpretationen der Ergebnisse von GPS- und Schweremeßkampagnen im Zeitintervall 1991–2000 bzw. 1992–1999 mit Hilfe lateral homogener Erdmodelle zur Bestimmung der Lithosphärenmächtigkeit, Asthenosphärenmächtigkeit und Asthenosphärenviskosität sind bislang nicht voll zufriedenstellend gewesen. Insbesondere nahe des Eisrandes war die Anpassung der berechneten Landhebung und Schwereänderung an die Beobachtungsdaten nur unzureichend, was mit der Nichtberücksichtigung...

The Changing Geomagnetic Field from the ionosphere to the core-mantle boundary

David Mozzoni
In this study two aspects of the geomagnetic field have been investigated. The first partfocuses on perturbations of the external field, as seen by the CHAMP satellite and predicted by the Thermosphere-Ionosphere Electrodynamic General Circulation Model, for the purpose of helping to separate out ionospheric sources from the ambient geomagnetic field using a physics based approach. Part two looks at variations of the internal field through an examination of the South Atlantic Anomaly.

Innovative technique for global control of layered and wave structures in the atmosphere and ionosphere by use of the CHAMP and FORMOSAT-3/COSMIC GPS radio occultation data base : final report 2007

A. G. Pavelyev, Jens Wickert, Torsten Schmidt, V. N. Gubenko, S. S. Matyugov, A. A. Pavelyev & V. A. Anufriev
The report contains a description of main results obtained within the researchcontract between IRE RAS and GFZ Potsdam and results of investigation during periodNovember-December 2007 – the third stage of the contract. The objectives ofinvestigation included (1) elaboration and verification of an innovative phaseacceleration-refraction attenuation technique to locate layered and wave structures inthe ionosphere and atmosphere; (2) elaborating of a new technique for identification ofwave origin of temperature and density fluctuations and determination of the...

Proceedings of the DENDROSYMPOSIUM 2007 : May 3rd - 6th 2007, Riga, Latvia

Didzis Elferts, Guntis Brumelis, Holger Gärtner, Gerhard Helle & Gerhard Schleser
This volume contains extended abstracts from talks and posters presented at the sixthTRACE (Tree Rings in Archaeology, Climatology and Ecology) conference, held in Riga(Latvia) May 3rd – 6th, 2007.

Global modeling of the effect of strong lateral viscosity variations on dynamic geoid and mantle flow velocities

Irina Rogozhina
This study is aimed at a development of numerical method to model the dynamic geoid and the surface plate velocities induced by global mantle flow with the effect of strong lateral viscosity variations (LVV) in conjunction with the effects of selfgravitationand mantle compressibility. I employ the technique, which comprises the combination of the spherical harmonic method, the direct Godunov method used for solving the Stokes and Poisson equations in spherical harmonics with arbitrary boundary conditions,...

A long-term model for non-tidal atmospheric and oceanic mass redistributions and its implications on LAGEOS-derived solutions of Earth's oblateness

Frank Flechtner, Maik Thomas & Rolf König
The dynamic oblateness of the Earth, in terms of the J2 or C20 coefficient of theEarth´s geo-potential has been derived by analysis of LAGEOS Satellite LaserRanging (SLR) data. Although recent analyses of GRACE (Gravity Recovery andClimate Experiment) mission data of monthly C20 values since 2002 have shown hightemporal correlations with LAGEOS results, significant differences still remain. As it iscommon practice in GRACE data processing to remove a priori the short-term nontidalatmospheric and oceanic induced variations...

Definition of functionals of the geopotential and their calculation from spherical harmonic models : theory and formulas used by the calculation service of the International Centre for Global Earth Models (ICGEM), http://icgem.gfz-potsdam.de

Franz Barthelmes
The intention of this article is to present the definitions of different functionals of the Earth's gravity field and possibilities for their approximative calculation from a mathematical representation of the outer potential. [...]More or less, what is compiled here is well-known in physical geodesy but distributed over a lot of articles and books which are not cited here. In the first instance this text is targeted at non-geodesists and it should be "stand-alone readable".

DESERT Dead Sea Rift Transect : an interdisciplinary research project to study the Dead Sea Transform

Michael Weber, K. Abu-Ayyash, A. Abueladas, A. Agnon, Z. Alasonati Tasárová, H. Al-Zubi, Andrey Babeyko, Y. Bartov, Klaus Bauer, M. Becken, P. A. Bedrosia, Z. Ben-Avraham, G. Bock, Marco Bohnhoff, Jens Bribach, Peter Dulski, J. Ebbing, R. El- Kelani, Andrea Förster, Hans-Jürgen Förster, U. Frieslander, Z. Garfunkel, H. J. Goetze, V. Haak, Christian Haberland … & K. Wylegalla
Scientific Technical Report STR; 09/08

Hyperspectral algorithms : report in the frame of EnMAP preparation activities

Hermann Kaufmann, Karl Segl, Sibylle Itzerott, Heike Bach, Annette Wagner, Joachim Hill, Birgit Heim, K. Oppermann, Wieke Heldens, Enrico Stein, Andreas Müller, Sebastian van der Linden, Pedro J. Leitão, Andreas Rabe & Patrick Hostert
Against the background of EnMAP preparation analyses have been carried out on the status of research in various areas of hyperspectral remote sensing for the use of existing algorithms in the EnMAP application box. The aim was to compose the status of research in Germany and internationally. Therefore, in various fields of expertise applied and accordingly available algorithms and products based on hyperspectral data has been evaluated and documented. The intention has been to demonstrate...

HALO_GPS software user manual : (High Altitude and LOng range airborne GPS positioning software) ; Version of 2010

Qianxin Wang, Tianhe Xu & Guochang Xu
HALO_GPS is a precise GPS kinematic positioning software. It was developed at GFZPotsdam for the German HALO project. The goal is to develop a software which is able to achieve cm-level accuracy for an aircraft trajectory for application in airborne gravimetry.

3D lithospheric-scale structural model of the Norwegian continental margin (the Vøring and Møre basins)

Magdalena Scheck-Wenderoth & Yuriy Maystrenko
[...] In order to construct the 3D structural model of the Norwegian continentalmargin, all mentioned datasets were compiled and gridded separately for eachlayer. The gridded data were merged into the 3D structural model and, therefore, all obtained thickness maps and structural depth maps are spatially consistent in 3D.

Spatial and temporal variability of the contemporary crustal stress pattern of the earth

Oliver Heidbach
This thesis summarizes the results of the WSM project’s second phase (1996‐2008). In particular it presents the major achievements that have been accomplished with the WSM 2008 database release that has been compiled under the guidance of the author. Furthermore, the thesis briefly presents three of the author’s numerical models that aim at quantification the temporal changes of the crustal stress field.

Geothermal energy utilization in low-enthalpy sedimentary environments

Ben Norden
The present work tries to condense the state‐of‐the‐art for the exploration and exploitation of geothermal energy. Although a lot of experiences from different sites worldwide are integrated in this study, some sections do reflect the German experience. For example, the German Renewable Energy Sources Act (EEG, see page 78) enables also a specific promotion and growth of the geothermal sector in Germany by guaranteeing special feed‐in tariffs for a 20‐years period. During the last years,...

3D structural model of the Glueckstadt Graben, NW Germany

Yuriy Maystrenko, Ulf Bayer & Magdalena Scheck-Wenderoth
Scientific Technical Report STR - Data; 11/08

Mechanical and Hydraulic Aspects of Rock-Proppant Systems : Laboratory Experiments and Modelling Approaches

Andreas Reinicke
[...] In context of this work, a new damage mechanism is proposed: the mechanically inducedfracture face skin. This new mechanism results from mechanical interactions between the proppants and the reservoir rock, due to the increasing stress on the rock-proppant system during production. Proppant embedment into the fracture face and proppant crushing leads to fines production and can impair the fracture performance. In order to achieve sustainable, longterm productivity from a reservoir, it is indispensable to...

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