Preprints
There are 6357 Preprints listed.
Two decades of land cover changes in the Colombian Andes
Published: 2025-08-27
Subjects: Environmental Monitoring, Other Earth Sciences
The Colombian Andes faces severe anthropogenic pressures from deforestation, agricultural expansion, mining, and urban development. Given its status as one of the world’s biodiversity hotspot, land cover monitoring for effective conservation strategies and sustainable development planning is essential. While early research relied on coarse or medium-resolution satellite imagery for limited [...]
Surface Expression of Low Basal Friction Upstream of Antarctic Grounding Lines
Published: 2025-08-27
Subjects: Earth Sciences, Glaciology, Physical Sciences and Mathematics
Ice sheets leave contact with the bed at grounding lines, beyond which floating ice shelves experience no friction at their base. In places where basal friction begins to decrease upstream of the grounding line, ice sheets respond more strongly to climate forcing. However, the spatial extent of zones of low grounding line friction is poorly constrained by observations. Here, we use a steady-state [...]
Earthquake body-wave extraction using sparsity-promoting polarization filtering in the time–frequency domain
Published: 2025-08-27
Subjects: Earth Sciences
Seismic waves generated by earthquakes consist of multiple phases that carry critical information about Earth’s internal structure as they propagate through heterogeneous media. Each seismic phase follows its own propagation path and sampling depth, bringing constraints from different regions of the Earth such as the crust, mantle, or even the outer and inner cores. The choice of phase for [...]
Assessing the Economic and Environmental Benefits of Nature-Based Solutions for Sustainable Infrastructure. A Case of Kumasi, Ghana
Published: 2025-08-26
Subjects: Education
Kumasi, Ghana, and most rapidly developing cities in Sub-Saharan Africa are confronted with increasing environmental and infrastructure concerns as a result of rapid urbanization, inadequate land use planning, and climate change. Traditional grey infrastructure has been inadequate in mitigating these problems. This paper assessed the economic and environmental advantages of Nature-Based Solutions [...]
Parasequences and Bedsets : Examples from the Book Cliffs and Wasatch Plateau of Eastern Utah
Published: 2025-08-26
Subjects: Earth Sciences
The Late Cretaceous strata that crop-out in east central Utah (USA) have been central to the development and testing of the sequence stratigraphic paradigm for almost 40 years. Large continuous cliff sections in the Books Cliffs and Wasatch Plateau are composed of shallow marine and coastal plain strata arranged in to cycles that show an upward shallowing of facies interpreted as parasequence. [...]
Creep behaviour of omphacite and amphibole-plagioclase symplectite: The role of heterogeneous hydration in the Tso Morari eclogite during retrogression
Published: 2025-08-26
Subjects: Earth Sciences
Replacement reactions progress to varying degrees depending on the P-T conditions, exhumation rates, and fluid availability. The preservation of reactants and retrogressed products allows for the reconstruction of microstructural and mineralogical progression, which we investigated using electron backscattered diffraction and microprobe analyses on the omphacite, amphibole-plagioclase [...]
Updated Trajectory and Spectral Insights into 3I/ATLAS: A Definitive Case for Natural Astrogeological Origins
Published: 2025-08-25
Subjects: Astrophysics and Astronomy, Earth Sciences, Geology, Other Astrophysics and Astronomy, Other Earth Sciences, Planetary Geology, Planetary Sciences, Planetary Sedimentology, The Sun and the Solar System
As seen in the most recent August 2025 Hubble imagery, the interstellar object 3I/ATLAS makes a strong case for its natural astrogeological origins, which is consistent with my previously published hypothesis that it is a lithified clastic fragment from an exoplanetary sedimentary basin. With an eccentricity of ~1.2 and an inclination of ~44°, refined trajectory data confirms a gravitational [...]
Design and Application of Three-component Force Sensor Principle and Structural Progress
Published: 2025-08-25
Subjects: Engineering
Three-component force sensors are capable of simultaneously detecting force or moment components in three directions in space, and are widely used in robotics, industrial automation, medical equipment, and sports technology. This article focuses on resistive-strain, capacitive, and piezoelectric three-component force sensors. Among them, the resistance strain type three-component force sensor has [...]
Strike-slip restraining screwed fault geometry reconstructed from the 2025 Myanmar earthquake
Published: 2025-08-25
Subjects: Applied Mathematics, Earth Sciences, Physical Sciences and Mathematics
We present a fault surface model of the 2025 Mw 7.7 Myanmar earthquake based on the potency density tensor inversion (PDTI) of teleseismic P-waves combined with surface reconstruction from distributed potency tensor solutions. Our source model demonstrates that the earthquake fault is twisted, varying the dip angle along strike. Inferred fault twists are prominent near fault-segment junctions, [...]
Rethinking glacial retreat and postglacial expansion of the Netropical palm Mauritia
Published: 2025-08-24
Subjects: Plant Sciences
This paper presents an unconventional perspective on the glacial retraction and postglacial expansion of the lowland Neotropical palm Mauritia flexuosa during the last glacial cycle. The classical view holds that this palm was confined to multiple wet refugia during the Last Glacial Maximum (LGM), owing to purported Neotropical-wide arid climates. From these refugia, M. flexuosa is thought to [...]
Validating and Comparing Energy Estimation Methods at Water Resource Recovery Facilities
Published: 2025-08-23
Subjects: Engineering
Water resource recovery facilities play a crucial role in the water-energy nexus, consuming a substantial amount of energy in the United States. Growing treatment volumes and more stringent water quality standards are expected to increase the amount of energy needed to treat wastewater, but accurately estimating energy consumption and potential remains challenging due to variability in scale, [...]
CHAPTER 4.4 Pyroclastic Density Currents
Published: 2025-08-23
Subjects: Volcanology
Pyroclastic density currents (PDCs) are hot mixtures of gases and volcanic rock of diverse size, nature, or density, capable of flowing over long distances at velocities of tens to hundreds of kilometers per hour. They typically originate from the gravitational collapse of explosive eruption columns, lava domes or lava-flow fronts, unstable upper-flank material or from explosive lateral blasts. [...]
Age-Stratified Socio-demographic Determinants of Water Insecurity in Urban Ghana
Published: 2025-08-23
Subjects: Geography
This study examines how age-stratified socio-demographic factors influence water insecurity in urban Ghana, where age-based access differences remain poorly understood. Using survey data from 627 households in three neighborhoods in Accra, we used stratified multivariate logistic regression to analyze water insecurity among three age groups: young adults (18–29 years; 59.2%), middle-aged adults [...]
Environmental and ecological changes across the Permian–Triassic transition in Türkiye: integrating virtual outcrop models and new fieldwork data
Published: 2025-08-22
Subjects: Biodiversity, Earth Sciences
The Permian–Triassic transition is characterized by major environmental changes (e.g., hyperthermals, perturbations in carbon cycle) and the largest known mass extinction event in the Phanerozoic. However, successions with a relatively complete sedimentological and paleontological record across the Permian–Triassic are limited to a few well-known sections in Europe and South China. Here, we [...]
Decadal Trends in Seasonal Climatic Variables in Dar es Salaam, Tanzania: A Non-Parametric Approach Using the Mann-Kendall Test
Published: 2025-08-21
Subjects: Oceanography and Atmospheric Sciences and Meteorology
Background: Coastal cities like Dar es Salaam face an increasing vulnerability to the adverse impacts of climate variability, including urban flooding, heat stress, and altered water availability. Examining the temporal evolution of key climatic variables is critical to informing adaptive strategies and promoting sustainable urban development. Methods: Decadal seasonal trends in rainfall, daytime [...]