Wolfgang Szwillus

Wolfgang Szwillus
Christian-Albrechts-Universität zu Kiel | CAU · Department of Geosciences

Doctor (Geophysics)

About

26
Publications
6,897
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289
Citations
Education
September 2008 - May 2014

Publications

Publications (26)
Article
Full-text available
Several alternative gravity forward modelling methodologies and associated numerical codes with their own advantages and limitations are available for the solid Earth community. With upcoming state-of-the-art lithosphere density models and accurate global gravity field data sets, it is vital to understand the opportunities and limitations of the va...
Article
Estimating the Depth To Magnetic Bottom (DTB) from magnetic data is one of the most important and difficult potential field inversion problems. Since DTB can often be linked to the Curie isotherm depth of magnetite (∼580○ Celsius), it could provide crucial constraints on heat flow, even in remote or inaccessible areas. Spectral methods are the most...
Preprint
Full-text available
Several alternative gravity forward modelling methodologies and associated numerical codes with their own advantages and limitations are available for the Solid Earth community. With the upcoming state-of-the-art lithosphere density models and accurate global gravity field data sets it is vital to understand the opportunities and limitations of the...
Article
Full-text available
The long‐wavelength negative gravity anomaly over Hudson Bay coincides with the area depressed by the Laurentide Ice Sheet during the Last Glacial Maximum, suggesting that it is, at least partly, caused by glacial isostatic adjustment (GIA). Additional contributions to the static gravity field stem from surface dynamic topography, core‐mantle bound...
Article
Full-text available
The nature and origin of the two large low-velocity provinces (LLVPs) in the lowest part of the mantle remain controversial. These structures have been interpreted as a purely thermal feature, accumulation of subducted oceanic lithosphere or a primordial zone of iron enrichment. Information regarding the density of the LLVPs would help to constrain...
Article
We present a novel approach for linearized gravity inversion to estimate the Moho depth, which allows the use of any gravitational component instead of the vertical gravity component only. The inverse problem is solved with the Gauss–Newton algorithm and the gravitational field of the undulating Moho depth is calculated with tesseroids. Hereby, the...
Article
Full-text available
Geothermal heat flux under the Antarctic ice is one of the least known parameters. Different methods (based on e.g., magnetic or seismic data) have been applied in recent years to quantify the thermal structure and the geothermal heat flux, resulting in vastly different estimates. In this study, we use a Bayesian Monte-Carlo-Markov-Chain approach t...
Presentation
Full-text available
Interpolationsverfahren erlauben die Vorhersage von geophysikalischen Parametern auch an Positionen, an denen selbst keine Messergebnisse vorliegen. Die Unsicherheit der Messungen kann dabei basierend auf Wiederholungsmessungen und bekannten Messgenauigkeiten abgeschätzt werden. Für interpolierte Werte liegen solche Unsicherheitsabschätzungen häufi...
Preprint
Full-text available
Abstract. The nature and origin of the two Large Low Velocity Provinces in the lowest part of the mantle remain controversial. They have been interpreted as a purely thermal feature, accumulation of subducted oceanic lithosphere or a primordial zone of iron enrichment. Information regarding the density of the LLVPs would help to constrain a possibl...
Article
Full-text available
An amendment to this paper has been published and can be accessed via a link at the top of the paper.
Article
This paper presents a new adaptive algorithm for topographic correction of gravity measurements based on a triangulated polyhedral representation of topographic surfaces. The adaptive grid resampling of topography is driven by the actual gravity effect on the station, which depends on the topographic mass and distance. This is a major improvement f...
Article
We present a new global model for the Earth’s lithosphere and upper mantle (LithoRef18) obtained through a formal joint inversion of 3-D gravity anomalies, geoid height, satellite-derived gravity gradients and absolute elevation complemented with seismic, thermal and petrological prior information. The model includes crustal thickness, average crus...
Article
Full-text available
This paper presents a new adaptive algorithm for topographic correction of gravity measurements based on a triangulated polyhedral representation of topographic surfaces. The adaptive grid resampling of topography is driven by the actual gravity effect on the station, which depends on the topographic mass and distance. This is a major improvement f...
Article
Full-text available
Active source seismology provides a critical constraint on the global crustal structure. However, the heterogeneous data coverage means that interpolation is necessary to fill the gap between seismic profiles. This has the potential to cause large uncertainties especially if the data are interpolated over a large distance. In previous models, geolo...
Article
Full-text available
Curvature components derived from satellite gravity gradients provide new global views of Earth’s structure. The satellite gravity gradients are based on the GOCE satellite mission and we illustrate by curvature images how the Earth is seen differently compared to seismic imaging. Tectonic domains with similar seismic characteristic can exhibit dis...
Chapter
Gravity-field interpretation and modeling require reliable corrections. In particular, gravitational effects of both topography and bathymetry need to be removed from any observed gravity field to reveal subsurface density anomalies. To accurately compute this effect, high-resolution, large-scale topography data are needed, because all wavelengths...
Poster
Full-text available
Active seismology provides the best knowledge of thickness and seismic velocity of the crust. However, seismic experiments are constrained to profiles and hence do not provide spatially complete coverage. Passive seismology can complement active seismology, but is in most cases also not providing an even station distribution. Therefore, crustal pro...
Article
Full-text available
The long-wavelength gravity field contains information about processes in the sub-lithospheric mantle. As satellite-derived gravity models now provide the long to medium-wavelength gravity field at unprecedented accuracy, techniques used to process gravity data need to be updated. We show that when determining these long-wavelengths, the treatment...
Article
Full-text available
The Gravity field and steady-state Ocean Circulation Explorer (GOCE) satellite aimed at determining the Earth’s mean gravity field. GOCE delivered gravity gradients containing directional information, which are complicated to use because of their error characteristics and because they are given in a rotating instrument frame indirectly related to t...
Conference Paper
Full-text available
For lithospheric scale modeling the vertical gravity acceleration or the geoid are used in most cases in addition to seismological and electromagnetic data. For such investigations, the gravity field is divided into lithospheric and sub-lithospheric parts. Often spherical harmonics degrees 2-9 are identified as the sub-lithospheric gravity field. H...
Conference Paper
Full-text available
Topographic correction is commonly conducted with a standard radius of 167 km (~1.5 °) around each station. It is a long standing question, whether this radius is appropriate in all cases. In areas of rugged topography the standard radius of 167 km can introduce long-wavelength artefacts from neglecting topography beyond this distance. Both very sm...
Article
Topographic reduction of potential fields (gravity and magnetics) is an important processing step for geophysical applications. The topographic signal can obscure subsurface anomalies, so measurements have to be corrected for its influence. Several algorithms are available for topographic reduction. These are based on cylindrical ring compartments,...

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