A5009450874- Geomagnetism and Paleomagnetism Studies
- Geophysical and Geoelectrical Methods
- Neural Networks and Applications
- Characterization and Applications of Magnetic Nanoparticles
- Geophysics and Gravity Measurements
- Scientific Research and Discoveries
- Theoretical and Computational Physics
- Geological and Geophysical Studies
- Statistical and numerical algorithms
- Numerical methods in inverse problems
- Radiomics and Machine Learning in Medical Imaging
- Non-Destructive Testing Techniques
- Geology and Paleoclimatology Research
- Magnetic and Electromagnetic Effects
- Advanced X-ray and CT Imaging
- Geological and Geochemical Analysis
- Electrical and Bioimpedance Tomography
Utrecht University
2021-2025
The Quantum Diamond Microscope holds the potential to revolutionize our field of research. It enables measurements on micrometer scale, going beyond bulk rocks that we as a research have been using so far. An inherent limitation QDM observations, however, is it measures magnetic flux in one direction, usually perpendicular surface sample. A image therefore set one-dimensional measurements, characterizing plane very close polished Following theory Kellogg, this geometry precludes making...
Data-based geomagnetic models are key for mapping the global field, predicting movement of magnetic poles, understanding complex processes happening in outer core, and describing expression field reversals. There exists a wide range models, which differ priori assumptions methods interpolation data space time. A frequently used modeling procedure is based on regularized least squares (RLS) spherical harmonic analysis, has been since 1980s. This technique minimizes error between modeled...
The Earth’s magnetic field, generated in the liquid outer core, predominantly behaves as a dipole over time. processes generating however, are complex and therefore also generate higher order pole signals. These signals can alter field on short time scale, even when signal is strong. A substantial deviation from current South Atlantic Anomaly (SAA), large weak spot above South-America. In SAA’s center, strength ~22 μT, approximately half of at same latitude...
Abstract Magnetic signals in igneous rocks arise from assemblages of iron‐oxide bearing minerals that differ for example, size, shape, and chemistry. Paleomagnetic measurements on bulk samples measure millions such grains simultaneously, producing a statistical ensemble the magnetic moments individual grains. Scanning magnetometry techniques as Quantum Diamond Microscope (QDM) micrometer scales, allowing identification sample using Micromagnetic Tomography (MMT). Here we produce grain‐size...
Abstract Micromagnetic Tomography (MMT) is a new technique that allows the determination of magnetic moments individual grains in volcanic rocks. Current MMT studies either showed it possible to obtain relatively small numbers ideal sample material or provided important theoretical advances inversion theory and/or its statistical framework. Here, we present large‐scale application on from 1907‐flow Hawaii's Kilauea volcano producing 1,646 grains. We produced 261,305 total for these grains,...
Abstract The recently developed Micromagnetic Tomography (MMT) technique combines advances in high resolution scanning magnetometry and micro X‐ray computed tomography. This allows precise recovery of magnetic moments individual grains a sample using least squares inversion approach. Here we investigate five factors, which are governing the mathematical validity MMT solutions: grain concentration, thickness sample, size sample's surface, noise level scan, sampling interval scan. To compute...
Micromagnetic tomography (MMT) is an emerging technique in rock and paleomagnetism to determine individual magnetic moments of tomographically defined source regions within a natural sample by means surface scans the field above sample. MMT relies on combining large high-resolution data sets from X-ray scanning devices, like quantum diamond magnetometers, together with advanced inversion algorithms potentially capable solve for millions moment vectors. We here provide overview existing that...
The magnetic information stored in volcanic rocks is a valuable archive of the history behavior Earth’s field. Micromagnetic Tomography (MMT) allows to determine moments individual iron-oxide grains rocks. Theoretically this enables us separate contributions from non-ideal recorders and ideal recorders, overcoming difficulties arising bulk measurements. Here we present results two sister specimens 1907-flow Hawaii’s Kilauea volcano which MMT was applied. One specimen...
Micromagnetic tomography (MMT) is a new promising paleomagnetic technique that obtains magnetic moments for individual iron-oxides. These are inferred from surface magnetometry data obtained with quantum diamond microscopy (QDM), and iron-oxide positions determined micro X-Ray computed (MicroCT). Different to classical techniques, MMT does not depend on bulk measurements of samples. This makes it possible only select the most reliable recorders. To make this improvement possible, first has...
Micromagnetic tomography (MMT) aims to go beyond paleomagnetic measurements on bulk samples by obtaining magnetic moments for individual iron-oxide grains present in a sample. To obtain accurate MMT results all sources and their signals should be known. Small particles (<<1 µm) are often not detected MicroCT analyses, but do have signal, therefore hamper reliable results. Currently it is unknown how many of these small ‘ghost grains’ basaltic samples. Here we aim realistic grain-size...
Earth and Space Science Open Archive This work has been accepted for publication in G-Cubed. Version of RecordESSOAr is a venue early communication or feedback before peer review. Data may be preliminary. Learn more about preprints. preprintOpen AccessYou are viewing the latest version by default [v3]A first-order statistical exploration mathematical limits Micromagnetic TomographyAuthorsFrenkOutiDDavidCortés-OrtuñoiDKarlFabianiDTristanvan LeeuwenLennartde GrootiDSee all authors Frenk...
&lt;p&gt;The recently developed Micromagnetic Tomography (MMT) technique allows precise recovery of magnetic moments individual grains in a sample. By combining high resolution scanning magnetometry and micro X-ray computed tomography (MicroCT) MMT has the potential to become an important asset rock-magnetic paleointensity studies. However, uncertainties moment solutions obtained through are yet enigmatic, making geologic application results uncertain. Therefore, we have made first...
Earth and Space Science Open Archive This preprint has been submitted to is under consideration at G-Cubed. ESSOAr a venue for early communication or feedback before peer review. Data may be preliminary.Learn more about preprints preprintOpen AccessYou are viewing the latest version by default [v1]Unravelling magnetic signal of individual grains in Hawaiian lava using Micromagnetic TomographyAuthorsMartha EKostersRosa Ade BoerFrenkOutiDDavid IgnacioCortés-OrtuñoiDLennart Vincentde GrootiDSee...
Earth and Space Science Open Archive This work has been accepted for publication in G-Cubed. Version of RecordESSOAr is a venue early communication or feedback before peer review. Data may be preliminary. Learn more about preprints. preprintOpen AccessYou are viewing an older version [v1]Go to new versionA first-order statistical exploration the mathematical limits Micromagnetic TomographyAuthorsFrenkOutiDDavidCortés-OrtuñoiDKarlFabianiDTristanvan LeeuwenLennartde GrootiDSee all authors...
Earth and Space Science Open Archive This work has been accepted for publication in G-Cubed. Version of RecordESSOAr is a venue early communication or feedback before peer review. Data may be preliminary. Learn more about preprints. preprintOpen AccessYou are viewing an older version [v2]Go to new versionA first-order statistical exploration the mathematical limits Micromagnetic TomographyAuthorsFrenkOutiDDavidCortés-OrtuñoiDKarlFabianiDTristanvan LeeuwenLennartde GrootiDSee all authors...