Preprints
There are 4715 Preprints listed.
Mesozoic drift of the Wrangellia superterrane revisited: the way forward from paleomagnetic data
Published: 2023-09-07
Subjects: Physical Sciences and Mathematics
The allochthonous origin of the Wrangellia superterrane relative to North America has been established in the early days of plate tectonics using paleomagnetic and geological data. However, long-standing disagreement between paleomagnetic and structural studies on magnitude of northward translation of the Wrangellia superterrane during the Latest Cretaceous–earliest Cenozoic has cast doubt on the [...]
The Nexus between Access to Agricultural Extension Services and Adoption of Sustainable Soil Conservation Practices in Limu Districts, Oromia, Ethiopia
Published: 2023-09-07
Subjects: Agriculture
Provision of agricultural extension service is the primary mechanism that increases smallholder farmer’s adoption of sustainable soil conservation practices. This study was, therefore, attempted to examine the nexus between access to agricultural extension services and the adoption of sustainable soil conservation practices in western oromia in the case Limu districts. Data was collected from [...]
The Eurasian Arctic Ocean along the MOSAiC drift in 2019-2020: An interdisciplinary perspective on physical properties and processes
Published: 2023-09-07
Subjects: Oceanography
The Multidisciplinary drifting Observatory for the Study of Arctic Climate (MOSAiC, 2019--2020), a year-long drift with the Arctic sea ice, has provided the scientific community with an unprecedented, multidisciplinary dataset from the Eurasian Arctic Ocean, covering high atmosphere to deep ocean across all seasons. However, the heterogeneity of data and the superposition of spatial and temporal [...]
Recent methane surges reveal heightened emissions from tropical inundated areas
Published: 2023-09-05
Subjects: Atmospheric Sciences, Biogeochemistry, Earth Sciences
Reevaluating the oxidation effect of garnet crystallization
Published: 2023-09-05
Subjects: Physical Sciences and Mathematics
Garnet has been proposed to be an important fractionating phase during magmatic differentiation in thick volcanic arcs because garnet fractionation can reproduce the hallmarks of continental crust by driving residual magmas to higher silica, lower total iron, and higher iron oxidation states. Recently authors have measured the partition coefficients for Fe2+ and Fe3+ between garnet and melt and [...]
Using convex optimization to efficiently apportion tracer and pollutant sources from point concentration observations
Published: 2023-09-05
Subjects: Computer Sciences, Earth Sciences, Environmental Sciences, Mathematics
Rivers transport elements, minerals, chemicals, and pollutants produced in their upstream basins. A sample from a river is a mixture of all of its upstream sources, making it challenging to pinpoint the contribution from each individual source. Here, we show how a nested sample design and convex optimization can be used to efficiently unmix downstream samples of a well-mixed, conservative tracer [...]
Imaging evidence of subduction, collision, and extension in northern Borneo: Constraints from receiver function
Published: 2023-09-04
Subjects: Earth Sciences, Geophysics and Seismology
Northern Borneo (Sabah) has a complex geological history, having experienced multiple episodes of subduction, magmatism, uplift, subsidence, and extension since the Mesozoic. This includes the subduction of the proto-South China Sea beneath what is now the north-western margin of Sabah, which terminated ~21 Ma; a postulated later phase of northward subduction of the Celebes Sea plate, which [...]
High Accuracy Estimation and Validation of InSAR-derived Surface Displacements at Temperate Raised Peatlands
Published: 2023-09-04
Subjects: Geophysics and Seismology, Hydrology, Soil Science
Peatland surface motion derived from satellite-based Interferometry of Synthetic Aperture Radar (InSAR) is potentially a proxy for groundwater level variations and greenhouse gas emissions from peat soils. Ground validation of these motions at equivalent temporal resolution and accuracy has proven problematic because of limitations of traditional surveying methods. Since 2019, peat surface motion [...]
The Role of Normal Fault Growth History in Influencing Fault Seal Potential, Samson Dome, Offshore Norway
Published: 2023-09-02
Subjects: Geology
The growth of normal faults can influence subsurface fluid flow and entrapment within rift basins. However, fault seal studies typically view faults as static structures, with their growth and the potential related temporal changes in hydraulic properties being ignored. In this study, we use borehole data and a high-quality 3D full-stack depth migrated seismic reflection volume to analyse the [...]
Reversal of the impact chain for actionable climate information
Published: 2023-09-02
Subjects: Physical Sciences and Mathematics
Escalating impacts of climate change underscore the risk of crossing thresholds of socio-ecological systems and adaptation limits. However, limitations in the provision of actionable climate information may hinder an adequate response. Here we suggest a reversal of the traditional impact chain methodology as an end-user focused approach to link local climate risks to emission pathways. We outline [...]
Full-waveform inversion as a tool to predict fault zone properties
Published: 2023-09-02
Subjects: Geology
Understanding the physical properties of fault zones is essential for various subsurface applications, including carbon capture and geologic storage, geothermal energy, and seismic hazard assessment. Despite improvements in fault imaging and visualisation, predicting the physical properties of faults and fault zones in the subsurface remains challenging, even with high-quality seismic reflection [...]
Tracking Changes in Magma Transport from Very-Long-Period seismic signals at Piton de la Fournaise volcano
Published: 2023-09-02
Subjects: Physical Sciences and Mathematics
Changes in magma properties and transport geometry can have a direct impact on volcanic activity. However, such variations can be difficult to track during eruptions. We report previously undetected very-long-period (VLP) signals at Piton de la Fournaise that can be used to probe changes in magma transport. Source analysis of VLP events during the August-October 2015 eruption indicates a source [...]
The uncertain future of mountaintop-removal-mined landscapes 2: Modeling the influence of topography and vegetation
Published: 2023-09-02
Subjects: Geomorphology
Erosion following human disturbance threatens ecosystem health and inhibits effective land use. Mountaintop removal/valley fill (MTR/VF) mined landscapes of the Appalachian Coalfields region, USA, provide a unique opportunity to quantify the geomorphic trajectory of disturbed lands. Here we assess how MTR/VF-induced changes to topography and vegetation influence spatiotemporal erosion patterns in [...]
Increased crevassing across accelerating Greenland Ice Sheet margins
Published: 2023-09-02
Subjects: Glaciology
The extent of surface crevassing on the Greenland Ice Sheet is a large source of uncertainty in processes controlling mass loss, including iceberg calving, ice rheology, and water routing. However, no work to date has comprehensively mapped the location of surface crevasses or examined their evolution through time. Here, we use high-resolution digital elevation models to map the 3-dimensional [...]
Garnet fracturing reveals ancient unstable slip events hosted in plate interface metasediments
Published: 2023-09-02
Subjects: Physical Sciences and Mathematics
A paradox exists between the great number of intermediate-depth earthquakes occurring along active subduction interfaces worldwide and the extreme scarcity of paleo-seismic events recorded in exhumed metasedimentary rocks from ancient subduction zones. Recrystallization, shearing as well as exhumation-related overprinting generally contribute to the nearly-complete erasing of markers of unstable [...]