Preprints
There are 6976 Preprints listed.
A Method for the Prediction of Seismic Discontinuity Topography from Thermochemical Mantle Circulation Models
Published: 2025-06-12
Subjects: Geophysics and Seismology
We demonstrate a method for the prediction of seismic discontinuity topography from thermochemical Mantle Circulation Models (MCMs). We find the discontinuity depth by using the peak reflectivity at each location in our mid-mantle, taking account of compositional as well as thermal variations. We make some comparisons of our predicted topographies with those observed using SS-precursors, [...]
Connectivity between primary and secondary subglacial drainage systems beneath a land-terminating outlet glacier of the Greenland Ice Sheet
Published: 2026-03-04
Subjects: Earth Sciences, Glaciology, Physical Sciences and Mathematics
The evolution and connectivity of subglacial drainage systems controls basal sliding and therefore modulates ice flow, yet direct observations of these systems remain limited. Here, we investigate hydraulic connectivity and its influence on ice motion at Isunnguata Sermia - a large land-terminating outlet glacier of the Greenland Ice Sheet. We use ‘Cryoegg’ wireless sensors to obtain moulin [...]
Microbial dynamics in an intertrappean lake during the terminal phase of Deccan volcanism
Published: 2025-06-11
Subjects: Education, Life Sciences, Physical Sciences and Mathematics
Biogeochemical changes associated with Deccan volcanism and their potential link to the K/Pg extinction event are still debated in Palaeoclimate research. Contemporary terrestrial organosedimentary deposits are important archives for understanding the perturbation in the biogeochemical cycling during this critical episode in Earth's history. Here, we report an intertrappean lacustrine carbonate [...]
Limitations of Mw and M Scales: Compelling Evidence Advocating for the Das Magnitude Scale (Mwg)—A Critical Review and Analysis
Published: 2025-06-12
Subjects: Engineering, Physical Sciences and Mathematics
Abstract Precise determination of earthquake size is cru cial for various geoscientific and engineering applications. The Moment Magnitude (Mw) scale, introduced by Kan amori in 1977, was a significant advancement. Kanamori (1977) advocated use of Mw for large earthquakes (≥ 7.5). (Hanks and Kanamori in J. Geophys. Res. 84:2348–2350) later extended the Mw scale named as M scale by [...]
Mitigating Methane in Jordan: National Inventory, Emission Projections, and Policy Pathways
Published: 2025-06-12
Subjects: Civil and Environmental Engineering
Jordan currently lacks a comprehensive national methane inventory with uncertainty analysisthat integrates multi-sectoral sources, future projections, and mitigation pathways. This study develops Jordan’s national methane inventory and assesses emission trajectories and mitigation potential through 2050. Methane emissions from the energy, transport, agriculture, solid waste and wastewater sectors [...]
Effects of IBGE's 2019 Biomes Definition on Different Political-Administrative Scales in Brazil
Published: 2025-06-13
Subjects: Sustainability
In 2019, the official delimitation of the Brazilian biomes was updated to a considerably more detailed description compared to the previous definition that lasted 15 years. This work investigates the possible effects of such changes in different political-administrative scales, ranging from biomes to the municipality level. We define effect levels according to the changes between the biomes in [...]
The geomorphological and sedimentological legacy of the historical Lake Lorsch within the Weschnitz floodplain (northeastern Upper Rhine Graben, Germany)
Published: 2025-06-11
Subjects: Earth Sciences, Geomorphology
The artificial historical Lake Lorsch (1474/79 to 1718/20 CE) in the northeastern Upper Rhine Graben (Germany) is known from various historical sources, e.g. for fish farming, as a significant anthropogenic imprint of the Weschnitz floodplain. Nevertheless, there have been no geomorphological and sedimentological investigations about the (quasi-)natural context for the creation of the lake, its [...]
Combined thermodynamic-kinetic-competitive controls on anaerobic respiration pathways and the chemistry of natural waters
Published: 2025-06-13
Subjects: Biogeochemistry, Earth Sciences
Microbial metabolisms underpin geochemical cycling in nearly all of the Earth's biosphere. Anaerobic pathways of carbon mineralization by iron and sulfate reduction and methanogenesis, in particular, have existed over most of Earth history and have been central in shaping the chemistry of the oceans and atmosphere. The governing principles by which microbial metabolisms contribute to water-column [...]
Green Hydrogen from Biomass in Kenya: Geospatial Feed-stock Mapping and Decentralized Energy Integration
Published: 2025-06-13
Subjects: Engineering, Physical Sciences and Mathematics
As countries race to decarbonize, green hydrogen has emerged as a crucial clean energy transformation vehicle. In Sub-Saharan Africa, sufficient biomass resource potential exists to become an actual feedstock for decentralised hydrogen production, but under-explored are the spatial mismatches between resource occurrences and infrastructure systems. The paper conducts a geospatial assessment of [...]
Determination of Low Molecular Weight Organic Acids in Environmental Samples by Ion Chromatography Method
Published: 2025-06-13
Subjects: Life Sciences, Medicine and Health Sciences, Physical Sciences and Mathematics
Ion chromatography using the IonPac AS 11 HC analytical column, a 3.0 mM NaOH eluent, and a conductivity detector offers a straightforward, cost-effective, and rapid method for quantifying six organic acids, Lactate, Formate, Acetate, Propionate, Pyruvate, and Glyoxalate, at concentrations as low as micrograms per liter in environmental samples. The method includes comprehensive details on [...]
Gamified Learning for Sustainable Eating: Exploring the Role of Prior Knowledge and Readiness to Change
Published: 2025-06-14
Subjects: Environmental Studies
Background: Dietary habits play a central role in the transition toward a more sustainable food system. However, many consumers lack an understanding of the principles of sustainable eating. Objective: This study examined whether a gamified quiz could enhance knowledge about the environmental impact of food. Additionally, it explored the role of prior knowledge and readiness for change, based on [...]
Simple solar system measurements indicate a weaker than expected relevance of Carbon Dioxide to present day earth temperature.
Published: 2025-06-15
Subjects: Physical Sciences and Mathematics
Recent and newly discovered causes of global warming are discussed especially in the context of lower relevance to CO2. Heat transfer mechanisms are discussed. The link between convective heat transfer and the thermodynamic and planetary hypotheses of Nikolov and Zeller are discussed. It is considered that the maximum surface temperature reached on an airless planetary body ( planet or moon) is [...]
Hellenic Arc tsunami generation from Mw8+ 3D margin-wide dynamic rupture earthquake scenarios
Published: 2025-06-16
Subjects: Geophysics and Seismology
The Hellenic Arc subduction zone is the most seismically active region in the Mediterranean, capable of generating large earthquakes and tsunami. Given the proximity of densely populated coastlines, understanding the characteristics of potential future large tsunamigenic earthquakes is crucial for assessing tsunami hazard. We present non-linear shallow water tsunami simulations sourced from the [...]
Morphometric Evidence for Cenozoic Intraplate Reactivation in NW Uruguay
Published: 2025-06-20
Subjects: Earth Sciences, Geomorphology, Physical Sciences and Mathematics, Tectonics and Structure
Located in eastern South America, Uruguay has been considered tectonically inactive since rifting in the Late Cretaceous. Here, we use a high-resolution digital elevation model (DEM) and field observations to investigate the presence of recent tectonic activity in the Basaltic Plateau, northwest Uruguay. Based on topographic, drainage network and field-based data, we identify evidence for [...]
Unraveling the effect of convergence obliquity on overriding-plate deformation and strain partitioning in subduction zones
Published: 2025-06-16
Subjects: Tectonics and Structure
The subduction of an oceanic plate causes deformation of the overriding plate, from the forearc to the back-arc regions. Over years, to address the physical controls on such a deformation, various compilations on active deformation have been made, mixing various types of datasets including fault-slip rates, focal mechanisms and geodetic motions. The growing amount of available data now allows for [...]