440 Works

Geochemische Signaturen der Metasedimente des erzgebirgischen Krustenstapels

Birgit Plessen
Scientific Technical Report STR ; 96/04

Advanced algorithms of inversion of GPS radio limb sounding data

Oleg I. Yakovlev, Alexandre G. Pavelyev, Stanislav S. Matyugov, Dmitrii Pavelyev & Vladimir A. Anufriev
Scientific Technical Report STR ; 01/06

Geostrophic Ocean Surface Velocities from TOPEX Altimetry, and CHAMP and GRACE Satellite Gravity Models

Henryk Dobslaw, Peter Schwintzer, Franz Barthelmes, Frank Flechtner, Christoph Reigber, Roland Schmidt, Tilo Schöne & Martin Wiehl
Recently released global gravity field models generated solely from CHAMP and GRACE satellite observations allow with an unprecedented accuracy and resolution the recovery of the mean sea surface topography from the difference between an altimetry-based mean sea surface height model and the gravity model's derived geoid. Here the CHAMP EIGEN-2 gravity field model, and the first GFZ GRACE gravity model, EIGEN-GRACE01S, are used. The mean sea surface height model has been compiled from four years';...

Zeitliche Schwereänderungen und glazio-isostatische Ausgleichsprozesse am Vatnajökull, Südostisland

Stefan Bürger, Wolfgang R. Jacoby, Jan M Hagedoorn & Detlef Wolf
Der glazio-isostatische Ausgleich in Island als Folge des Abschmelzens der größten europäischen Eiskappe, dem Vatnajökull, verursacht zeitliche Änderungen der Schwere und Landhebung. Nach Auswertung der Schweredaten zeigt sich ein charakteristisches Verhalten. Die Schwereänderungsrate beträgt ca. -4 mikroGal/a am Eisrand (50 km Entfernung vom Eiszentrum)und ca. 1 mikroGal/a in Höfn (75 km Entfernung vom Eiszentrum). In größeren Entfernungen vom Eiszentrum (150 bis 250 km) werden die Raten kleiner als 1 mikroGal/a und nähern sich schließlich Null....

Nadeln im Heuhaufen

Michael Kühn, Oliver Heidbach, Arnd Heumann & Josef Zens
Die Suche nach einem Standort zur Endlagerung von hochradioaktivem Abfall ist eine generationenübergreifende soziale und politische Aufgabe mit geowissenschaftlichem Kern. Deutschland hat dafür einen partizipativen Prozess gestartet. Die erste Herausforderung ist die Eingrenzung geeigneter Gebiete beginnend mit der gesamten Bundesrepublik. Die zweite ist den Untergrund im Bereich der verbleibenden wenigen Prozent der Landesfläche mit geowissenschaftlichem Wissen, Methoden und Daten detailliert auf seine Eignung hin zu untersuchen.

Reproduzierbarkeit und Auflösungsvermögen faseroptischer Temperaturmessungen für Bohrlochanwendungen: Untersuchungen in der Klimakammer des GFZ

Kemal Erbas, Grit Dannowski & Jörg Schrötter
Scientific Technical Report STR ; 99/19

Licht ins Dunkel bringen

Stefan Lüth, Roman Esefelder, Heike Richter, Katrin Jaksch, Benjamin Schwarz, Britta Wawerzinek, Rüdiger Giese & Charlotte M. Krawczyk
Die Mindestanforderungen des Standortauswahlgesetzes stellen hohe Ansprüche an die physikalischen Eigenschaften des Wirtsgesteins an einem möglichen Endlagerstandort. Geophysikalische Verfahren können ein strukturelles Abbild des Untergrunds liefern und diesen beschreiben, von der Erdoberfläche bis in die Tiefe des Endlagers und darunter. Für die Erkundung eines Endlagerstandorts sind hochauflösende Verfahren notwendig, die weit über Standardmethoden der seismischen und geologischen Untersuchungen hinausgehen.

Competing controls of fluid overpressurization and chloritization on strength and instability of faults in granite: Implications for seismicity triggered by fluid-injection

Fengshou Zhang, Rui Huang, Mengke An, Ki-Bok Min, Derek Elsworth, Hannes Hofmann & Xiaoguang Wang
Fluids injection for hydraulic stimulation and fracturing, typical in the development of enhanced geothermal systems (EGS) in granites, can reactivate deep faults and induce seismicity. Such faults typically contain chlorite coatings as an alteration product that may impact styles of deformation – aseismic through seismic. We performed shear experiments on simulated granite fault gouges under conditions typifying a geothermal reservoir at ~4 km depth with a confining pressure of 110 MPa, a temperature of 150℃,...

Helmholtz Open Science Briefing. Helmholtz Open Science Praxisforum Forschungsdatenmanagement. Report

Nina Leonie Weisweiler, Roland Bertelmann, Jan Bumberger, Kirsten Elger, Maik Fiedler, Patrick Fuhrmann, Oliver Knodel, Rolf Krahl, Özlem Özkan, Florian Rhiem, Ines Schmahl, Sophie Servan, Arne Upmeier & Kerstin Vanessa Wedlich-Zachodin
Zum Austausch von Best Practices aus den Zentren und zur Förderung der FDM-Community in Helmholtz veranstaltete das Helmholtz Open Science Office am 3. Februar 2022 das erste „Helmholtz Open Science Praxisforum Forschungsdatenmanagement“. In dem Helmholtz-internen Forum wurden exemplarisch verschiedene Herangehensweisen aus Zentren zur Organisation des FDM vorgestellt. Darüber hinaus standen konkrete Service-Angebote zu FDM im Mittelpunkt. Außerdem wurde die Vernetzung mit externen Akteuren, z. B. im Rahmen der NFDI, EOSC oder der RDA, beleuchtet. Die...

Uncertainty Quantification for Geothermal Basin- and Reservoir-Scale Applications

Denise Degen, Mauro Cacace, Magdalena Scheck-Wenderoth, Karen Veroy & Florian Wellmann
Numerical simulations of the governing geophysical processes are crucial for geothermal applications in order to characterize the subsurface. This characterization presents us with major challenges ranging from the correct physical and geometrical characterization to the quantification of uncertainties. Quantifying rock physics uncertainties and performing other probabilistic inverse methods is, even with current state-of-the-art finite element solver and high-performance infrastructures, computationally not feasible for complex basin- and reservoir-scale geothermal applications due to the large spatial, temporal,...

Access to and Reuse of Research Software – Position paper of the Helmholtz Association Open Science Working Group

This position paper was drafted by the Task Group “Access to and Reuse of Research Software” of the Helmholtz Association Open Science Working Group and adopted by the Open Science Working Group on March 14, 2017.

Latest results from the hybrid micro-gravity monitoring of the Theistareykir geothermal field (North Iceland)

Nolwenn Portier , Jacques Hinderer , Florian Schäfer , Philippe Jousset , Kemal Erbas , Vincent Drouin , Vincent Drouin , Freysteinn Sigmundsson , Ingwar Magnusson , Gylfi Pall Hersir , Kristjan Agustsson , Agrismur Gudmundsson , Egill Juliusson , Hreinn Hjartasson , Hreinn Hjartasson & Jean-Daniel Bernard
Geothermal energy represents around 30% of the produced electricity in Iceland with a cumulative capacity being equal to 755 MWe (Ragnarsson et al., 2020). In particular, the Theistareykir geothermal plant, which is located on the Mid-Atlantic ridge in North Iceland, produces 90 MWe using two turbines in operation since autumn 2017 and spring 2018, respectively. We will report on the hybrid micro-gravity monitoring and discuss how this technique will contribute to the sustainable management of...

Structure and density configuration of Germany’s subsurface: 3-D-Deutschland, an updated three-dimensional lithospheric-scale model

Denis Anikiev , Judith Bott , Mauro Cacace , Hans-Jürgen Götze & Magdalena Scheck-Wenderoth
With this study we revise and improve the three-dimensional lithospheric-scale structural and density model of Germany (3-D-D). Major shortcomings of this model resulted from joining three regional 3-D models that were poorly covered by data at their margins. Merging into a larger model revealed structural inconsistencies in these “marginal” domains. In order to resolve discrepancies between the units in a more consistent way we integrate newly available data from seismic reprocessing, tomography, and use 3-D...

Magnesium and calcium isotope fractionation during microbial dolomite formation

Michael Tatzel , Adina Paytan , Samantha Carter , Daniel A. Frick , Francisca Martinez-Ruiz , Zach A. DiLoreto , Maria Dittrich , Tomaso R. R. Bontognali & Mónica Sanchez-Román
Microbial mediation is considered an important process for the formation of primary dolomite at ambient temperature. Yet, no structural, mineralogical, chemical or isotopic means exist to discern this mode of dolomite formation from secondary dolomite. To explore the utility of metal isotopes in allowing this distinction we characterize magnesium and calcium stable isotope ratios in primary (proto)dolomites from a modern hypersaline environment. Samples from the Khor Al-Adaid sabkhas in Qatar show consistent isotopic differences of...

Summary of the ground-motion characterisation model for the 2022 New Zealand National Seismic Hazard Model

Brendon A. Bradley, Sanjay Bora, R. L. Lee, Elena F. Manea, Matt C. Gerstenberger, P. J. Stafford, G. M. Atkinson, G. Weatherill, J. Hutchinson & C. A. de la Torre
This document provides a high-level summary of the ground-motion characterisation model component of the 2022 New Zealand National Seismic Hazard Model. This includes: development of a New-Zealand-specific ground-motion database; consideration of alternative empirical ground-motion models based on global datasets; two new New-Zealand-specific models that were developed as part of the project; comparisons of the alternative models against observational data; and considered modifications of the ‘base’ models to account for near-fault directivity, back-arc attenuation for subduction...

Satellitendaten visualisieren und analysieren – Erste Schritte mit QGIS

Antonia Cozacu, Helga Kuechly, Clara Nicolai, Claudia Vallentin & Nora Meyer zu Erpen
Satellitendaten in einem GIS zu bearbeiten, ist gar nicht so kompliziert. Das zweite Dokument aus der Reihe SAPIENS: Satellitendaten für Planung, Industrie, Energiewirtschaft und Naturschutz ermöglicht den Einstieg in das kostenlose Geoinformationssystem QGIS und beschreibt grundlegende Arbeitsschritte bei der Verarbeitung optischer Satellitendaten. Schritt für Schritt erklären wir, wie man die Daten mit QGIS in verschiedenen Bandkombinationen darstellen und Indizes berechnen kann und wie man sie symbolisieren, zuschneiden und exportieren kann, mit vielen zusätzlichen Tipps, weiterführenden...

The Yarmouk basin, an essential transboundary water resource

Christian Siebert , E. Shalev , F. Magri , P. Möller , E. Salameh & T. Rödiger
The Yarmouk River is the primary tributary to the Jordan River and a strategic transboundary freshwater resource of Syria, Jordan, and Israel. In the past decades, the Yarmouk watershed has been extensively exploited by the riparian with the construction of dams including the Al-Wehda and Adassiyeh dams. The operation of the dams is guided by international water agreements between Jordan and Israel and Jordan and Syria and control the flux of the Yarmouk River. Repeated...

LI@Geo.X – A Laboratory Infrastructure Search Portal for the Geo.X Network

Manja Luzi-Helbing , Christopher Hamann , Kirsten Elger , Damian Ulbricht , Florian Ott , Marc Hanisch , Nils Brinckmann , Hannes Fuchs , Hildegard Gödde , Roland Bertelmann & Lutz Hecht
Geo.X is the research network for geosciences in the Berlin and Potsdam metropolitan region and integrates five universities and six extramural research institutions. Our partners are committed to a FAIR and sustainable handling of research data and infrastructures. For this purpose, we established a search portal for the geoscientific laboratory infrastructure and related research data of the network partners (LI@Geo.X). The portal aims to increase the visibility and accessibility of the partner institutions’ infrastructures, data,...

SpannEnD - The crustal stress state of Germany

Steffen Ahlers , Andreas Henk , Tobias Hergert , Karsten Reiter , Birgit Müller , Luisa Röckel , Oliver Heidbach , Sophia Morawietz , Magdalena Scheck-Wenderoth & Denis Anikiev
Information about the recent stress state of the upper crust is important for understanding tectonic processes and for the use of the underground in general. A currently important topic, the search for a radioactive waste deposit, illustrates this relevance, as the crustal stress state is decisive for the short and long-term safety of a possible repository. For example, the integrity of the host rock due to the activation or reactivation of faults and associated fluid...

Open science & reproducibility

Lea Maria Ferguson & Antonia Schrader

Hydro-mechanical parameters of Cornubian and Odenwald reservoir granitoids with focus on fracture stiffness testing

Lena Muhl , Guido Blöcher , Ingo Sass , Christian Kluge & Tanja Ballerstedt
For the resource development, geothermal systems need to be improved to increase the profitability of the investment. One aspect to support this aim is the reservoir productivity, a key parameter, which depends on the hydraulic and mechanical properties of the reservoir formation. In order to develop possible improvement strategies for the profitability enhancement of geothermal reservoirs and/or nuclear waste repositories, hydraulic and mechanical properties of artificial generated fractures were investigated. The importance of the fracture...

A global rate of denudation from cosmogenic nuclides in the Earth’s largest rivers

Hella Wittmann , Marcus Oelze , Jerome Gaillardet , Eduardo Garzanti & Friedhelm von Blanckenburg
Cosmogenic nuclide analysis in sediment from the Earth’s largest rivers yields mean denudation rates of the sediment-producing areas that average out local variations commonly found in small rivers. Using this approach, we measured in situ cosmogenic 26Al and 10Be in sand of >50 large rivers over a range of climatic and tectonic regimes covering 32% of the Earth’s terrestrial surface. In 35% of the analyzed rivers, 26Al/10Be ratios are significantly lower than these nuclides´ surface-production-rate...

Co-variation of silicate, carbonate, and sulfide weathering drives CO2 release with erosion: Constraints from southern Taiwan.

Aaron Bufe , Niels Hovius , Robert Emberson , Jeremy Rugenstein , Albert Galy , Hima Hassenruck-Gudipati & Jui-Ming Chang
The supply of fresh minerals to Earth’s surface by erosion is thought to modulate global climate by removing atmospheric carbon dioxide (CO2) through silicate weathering. In turn, weathering of accessory carbonate and sulfide minerals is a geologically-relevant CO2 source, which may dampen or reverse the effect of silicate weathering on climate. Although these weathering pathways commonly operate side by side, we lack quantitative constraints on their co-evolution across erosion-rate gradients. Using stream-water chemistry across a...

Methane seepage in the northwestern part of the German North Sea

Miriam Römer , Martin Blumenberg , Katja Heeschen , Stefan Schlömer , Hendrik Müller , Simon Müller , Christian Hilgenfeldt , Udo Barckhausen & Katrin Schwalenberg
We studied seafloor characteristics, water column anomalies, and sediment methane geochemistry in the German sector of the central North Sea during a research cruise with the German research vessel Heincke in summer 2019. An extensive hydroacoustic mapping campaign revealed the presence and distribution of flares in the water column, indicative for gas bubble releases as well as for geophysical subsurface indications of elevated gas concentrations. We analyzed the spatial distances of detected flares to subsurface...

Helmholtz Open Science Briefing. Helmholtz Open Science Forum: Open Science und Transfer. Report

L. M. Ferguson, Roland Bertelmann, Christoph Bruch, C. Cremer, A. Hauri, G. Krause, J. Krupa, I. Mahns, Heinz Pampel, A. C. Schrader, P. Schultze-Motel, S. Weg-Remers, N. L. Weisweiler, J. Winzer & B. Wolf
Am 12. Mai 2022 veranstaltete das Helmholtz Open Science Office ein Helmholtz Open Science Forum zum Thema Open Science und Transfer. Die virtuelle, Helmholtz-interne Veranstaltung widmete sich verschiedenen Aspekten und Fragestellungen rund um das Zusammenspiel von Open Science, Technologietransfer sowie Wissenstransfer in der Helmholtz-Gemeinschaft. Gemeinsam mit den Referent:innen und Teilnehmenden wurden Kooperationsmöglichkeiten, Handlungsnotwendigkeiten und Perspektiven thematisiert. Ein zentrales Resümee der Vorträge und Diskussionen war, dass in Helmholtz ein Konsens darüber besteht, dass Open Science und...

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