Preprints
Filtering by Subject: Physical Sciences and Mathematics
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 [...]
Quantifying sulfur speciation in magmatic-hydrothermal fluids
Published: 2025-06-11
Subjects: Chemistry, Earth Sciences, Geochemistry, Geology, Inorganic Chemistry, Natural Resource Economics, Physical Chemistry, Physical Sciences and Mathematics
Quantitative knowledge of sulfur speciation in the fluid phase is key to understanding sulfur degassing from magmas and its transfer along with metals by fluids across the lithosphere. Farsang and Zajacz(1) recently reported new sulfur speciation data using Raman spectroscopy measurements on aqueous H2SO4-NaCl(-KCl) solutions trapped as synthetic fluid inclusions in quartz at 875 °C and 2 kbar [...]
Enhancing daily precipitation reconstruction: An improved version of the reddPrec R package
Published: 2025-06-10
Subjects: Engineering, Physical Sciences and Mathematics
Reconstructing high-quality daily precipitation series is essential for climate studies, hydrological modeling, and environmental applications. This work presents a new version of reddPrec, a versatile and flexible R package designed to reconstruct precipitation datasets through standard quality control, gap-filling, and grid creation procedures. The update introduces greater flexibility in [...]
A Method to Calculate the Centroid of Areas on a Sphere and its Application to Determining Geographic Centers
Published: 2025-06-08
Subjects: Physical Sciences and Mathematics
This study shows how a method of calculating the coordinates of the centroid of discrete points on a sphere can be generalized to determine the centroid of areas on a sphere by minimizing the surface integral of squared spherical distances. A quadratically convergent algorithm for calculating the coordinates of the centroid is presented. Equations are given to verify that the centroid so [...]
Linked canyons and fans communicate through a migrating bedrock-alluvial transition
Published: 2025-06-07
Subjects: Earth Sciences, Geomorphology, Physical Sciences and Mathematics
The evolution of net-erosional fluvial landscapes is often treated separately from net-depositional fluvial landscapes, using different methods and different data input. Yet these landscapes are often tightly linked by means of a moving-boundary bedrock-alluvial transition. We consider a linked canyon-fan system in the setting of a Basin and Range province, basing our work loosely on Rainbow [...]
Revisiting GPS-Derived Plate Kinematics: Evaluation of the Integration of Plate Motion Models in Terrestrial Reference Frames
Published: 2025-06-07
Subjects: Engineering, Physical Sciences and Mathematics
Tectonic plate motion is a cornerstone of the physical theory of plate tectonics, yet our understanding of lithospheric kinematics increasingly depends on the framework in which measurements are interpreted. With the advent of satellite-based geodesy, particularly the Global Positioning System (GPS), direct measurement of Earth’s surface dynamics has become possible with millimeter-level [...]
Supershear source model of the 2025 M7.8 Myanmar earthquake and paleoseismology of the Sagaing Fault: regions of significant overlap with past earthquakes
Published: 2025-06-06
Subjects: Earth Sciences, Physical Sciences and Mathematics
The 2025 Mw 7.8 earthquake on the central Sagaing Fault is one of the most destructive seismic events in Myanmar's recorded history, producing near-fault shaking exceeding Modified Mercalli Intensity X and impacting tens of millions of people across Southeast Asia. We present a detailed kinematic rupture model of the event based on joint inversion of regional strong motion waveforms and [...]
Spatiotemporal dynamics of floodplain patterns during the last 400 years south of Leipzig - A regional scale analysis
Published: 2025-06-05
Subjects: Earth Sciences, Geographic Information Sciences, Geography, Geomorphology, Other Earth Sciences, Physical and Environmental Geography, Physical Sciences and Mathematics, Remote Sensing, Social and Behavioral Sciences
The Elster-Pleiße floodplain south of Leipzig has undergone significant hydromorphological changes over the past centuries, influenced by both natural processes and anthropogenic interventions. This study employs high-resolution LiDAR-based fluvial-geomorphological mapping (1x1 m resolution) and old maps analyses to reconstruct past river dynamics and identify shifts in channel morphology. [...]
Improving magmatic CO2 reconstruction using X-ray Computed Tomography to accurately quantify melt inclusion volumes and geometries
Published: 2025-06-04
Subjects: Earth Sciences, Geochemistry, Physical Sciences and Mathematics, Volcanology
Melt inclusions provide valuable insights into magmatic systems, allowing the study of otherwise inaccessible melts. Trapped volatile contents, commonly in the form of bubbles within melt inclusions, allow direct sampling and study of magmatic volatiles that are otherwise lost due to saturation and degassing. Quantifying magmatic volatiles such as CO2 is a complex process requiring multiple [...]
Vegetation Dynamics and Their Contribution to the Little Ice Age
Published: 2025-06-02
Subjects: Physical Sciences and Mathematics
Causes of the Little Ice Age (LIA) have remained a subject of intensive research due to its significance. The causes of the LIA have been largely speculative; however, recent studies suggest that plant and vegetation growth may provide a plausible explanation. The LIA period coincided with an ecological encounter, as humans from the Old and New Worlds exchanged goods and diseases. A significant [...]
Large-sample characterization of flooding events in India
Published: 2025-05-31
Subjects: Engineering, Physical Sciences and Mathematics
Effective flood management requires a robust understanding of past floods. In India, such understanding is largely limited to case studies due to the absence of a standardized observed flood dataset. We address this gap by presenting a national dataset of 7500 flooding events, developed by merging observed streamflow records with official flooding thresholds and augmenting it with multiple [...]
Unsupervised data selection for focused time-lapse inversion in electrical resistivity tomography monitoring
Published: 2025-05-29
Subjects: Physical Sciences and Mathematics
Time-lapse electrical resistivity tomography (TLERT) is a popular technique to monitor subsurface processes. Inversions and interpretation often remain challenging because of noisy data and the superposition of several processes influencing the results. To improve TLERT imaging, we apply clustering of data time series prior to the inversion process. We invert only for a subset of data points [...]
Transition from wave- to tide-dominated estuary: An example from the Eocene Urahoro Group, eastern Hokkaido, northern Japan
Published: 2025-05-28
Subjects: Physical Sciences and Mathematics
Estuarine morphologies are commonly classified into two end-member categories based on dominant sediment transport processes: wave-dominated and tide-dominated estuaries. Although estuaries are generally presumed to retain their fundamental morphotypes throughout their evolutionary history, this study presents the first documented ancient example of a morphological transition from a wave-dominated [...]
Inference of the S- to P-wave velocity anomalies ratio and its uncertainty with an application to South-East Asia
Published: 2025-05-27
Subjects: Physical Sciences and Mathematics
The ratio R of shear-wave to compressional-wave velocity variations (dlnVs/dlnVp) is a useful physical parameter to study the thermochemical properties of the Earth's interior. Several approaches have been employed to estimate R (or its inverse 1/R), but they either assume the same local resolution in models of dlnVs and dlnVp or assume the same ray paths for S- and P-phases, while excluding [...]
Mainshock Rupture Properties, Aftershock Activities and Remotely Triggered Seismicity Associated with the 2025 Mw7.7 Sagaing Fault earthquake in Myanmar
Published: 2025-05-27
Subjects: Physical Sciences and Mathematics
A devastating Mw 7.7 earthquake struck near Mandalay, Myanmar, on March 28, 2025, causing extensive damage and casualties across Myanmar and neighboring regions. The 2025 event occurred in a well-recognized seismic gap along the Sagaing Fault. Here we focus on the mainshock rupture properties based on back-projection of teleseismic P waves and early aftershock locations, analysis of near-field [...]