Preprints
There are 7999 Preprints listed.
Unusual Drilling-Induced Stress Features - What To Do With You?
Published: 2025-11-14
Subjects: Physical Sciences and Mathematics
Drilling-induced features identified from borehole image logs provide direct constraints on in-situ stress orientations and magnitudes. Classic features such as drilling-induced tensile fractures and borehole breakouts have been extensively documented since the 1980s, predominantly in sedimentary rocks within hydrocarbon reservoirs. More recently, petal-centreline fractures have also been [...]
Practical guide for volcano observatories on paleomagnetic sampling of pyroclastic deposits from active volcanoes
Published: 2025-11-14
Subjects: Geophysics and Seismology, Volcanology
This brief guide is designed to teach workers at observatories of volcanoes exhibiting explosive activity how to take samples of pyroclastic deposits for paleomagnetic studies. Paleomagnetism is a powerful tool for studying volcanoes, both dormant and currently active. Studies of the rock magnetic and paleomagnetic characteristics of volcanic rocks can provide important information about volcanic [...]
Palynofacies And Paleoenvironmental Studies of TDA-1 Well, Niger Delta Basin, Nigeria
Published: 2025-11-14
Subjects: Earth Sciences, Physical Sciences and Mathematics
The palynofacies and paleoenvironmental study of TDA-1 well, Niger Delta Basin, Nigeria between intervals of 6160 to 14470 feet (1878 to 4410 meter). The Niger Delta Basin is a crucial geological formation that has significant hydrocarbon reserves and supports diverse ecosystems where three main formations in ascending order are formed including the Paleocene Akata Formation, Eocene Agbada [...]
Integrated Geophysical and Hydrochemical Assessment of Groundwater Salinization in the Western Nile Delta, Egypt
Published: 2025-11-15
Subjects: Earth Sciences, Life Sciences
A total of integrated geophysical and hydrochemical investigations were conducted to characterize groundwater salinization in the western Nile Delta, Egypt. Twenty-five time-domain electromagnetic (TDEM) soundings and 30 water samples (depths 5–167 m) were used together with borehole logs and temporal comparison to 2012 datasets. One-dimensional TDEM inversion and 3-D resistivity modeling [...]
The Geography of Insufficient Sleep in the Contiguous United States (CONUS)
Published: 2025-11-15
Subjects: Medicine and Health Sciences, Social and Behavioral Sciences
Insufficient sleep is becoming increasingly prevalent, partially because of the accelerated pace of modern life, and is linked to a wide range of adverse physical and mental health outcomes. While several social, physical, and environmental factors are known to influence sleep duration, the underlying mechanisms and their geographic variability remain poorly understood. The growing availability [...]
Standing wave-induced tidal shear in a submarine canyon in the Rockall Trough
Published: 2025-11-15
Subjects: Physical Sciences and Mathematics
Mixing in the ocean abyss sustains the deepest branches of the global overturning circulation, yet the processes that drive deep-ocean mixing remain poorly understood. Recent field measurements in a deep submarine canyon of the Rockall Trough have revealed that intense mixing occurs during strong, vertical shear-generated overturns exceeding 200 meters. These overturning events last only a few [...]
COMPARATIVE STUDY OF MONSOON AND IOD EFFECTS ON RAINFALL VARIABILITY IN NORTH AND SOUTH SUMATRA
Published: 2026-04-30
Subjects: Physical Sciences and Mathematics
Sumatra Island exhibits distinct rainfall characteristics between its northern and southern regions due to its equatorial position. Generally, Northern Sumatra displays a bimodal rainfall pattern driven by the movement of the Intertropical Convergence Zone (ITCZ), whereas Southern Sumatra follows a monomodal pattern influenced by the Asian-Australian Monsoon system. This study aims to evaluate [...]
Comparative Evaluation of Threshold Pressure Measurement Techniques in Faulted and Shale Formations
Published: 2025-11-16
Subjects: Physical Sciences and Mathematics
Reliable estimation of capillary threshold pressure is essential for evaluating the sealing capacity of subsurface flow barriers, which has important applications in fluid storage. This study compares the results of capillary threshold pressure measurements obtained from four experimental techniques: (i) gas breakthrough, (ii) mercury injection capillary pressure (MICP), (iii) Porosimetry under [...]
Lithological heterogeneity controls high-temperature ductile deformation and late melt infiltration in moderately-magmatic OCCs
Published: 2025-11-17
Subjects: Earth Sciences, Geology, Tectonics and Structure
Oceanic core complexes (OCCs) are a fundamental component of slow-to-ultraslow spreading mid-ocean ridges, yet the processes that control OCC formation and evolution are poorly understood especially with respect to their high-temperature lithospheric roots. We present detailed analyses of high-temperature ductile deformation preserved in drill-core from IODP Hole U1601C, on the Atlantis Massif [...]
Changes in Oceanic Carbon Storage due to Anthropogenic Carbon Input over the Past Three Decades
Published: 2025-11-18
Subjects: Climate, Oceanography
While the ocean is known to be an important sink for anthropogenic CO2 emissions, assessing trends in ocean’s uptake and storage of atmospheric CO2 is complicated because changes in the ocean dissolvedinorganic carbon (DIC) concentrations due to natural ocean circulation patterns and flux of anthropogenic CO2 need to be disentangled. In this study, we analyze the interannual and decadal changes [...]
Impact of weather and season on stored water contamination and infant diarrhea in climate-vulnerable, urban Mozambique
Published: 2025-11-18
Subjects: Public Health
Background: Diarrhea remains one of the leading causes of morbidity and mortality for children under the age of five, despite reductions in its overall global burden in recent decades. However, climate change, and its associated meteorological conditions - heavy rainfall, temperature, flooding - has the potential to impede or reverse progress that has been made toward alleviating the burden of [...]
The slip distributions of the 1952 and 2025 Kamchatka earthquakes from tsunami waveforms recorded around the Pacific Ocean
Published: 2025-11-18
Subjects: Earth Sciences, Geophysics and Seismology, Physical Sciences and Mathematics
The July 2025 Kamchatka earthquake (Mw 8.8) generated Pacific-wide tsunamis. Inversion of 40 DART bottom pressure records around the Pacific Ocean revealed a large (~ 9 m) slip at 200 – 400 km southwest of the epicenter, closely matching the USGS finite fault model based on teleseismic data. In this region, a similarly large megathrust earthquake (M ~ 9) occurred in 1952. The tsunami waveforms [...]
Interplay between subsidence and sediment flux in the filling of the North Pyrenean retro-foreland basin during the Eocene (Corbières, France)
Published: 2025-11-19
Subjects: Earth Sciences
External forcings, such as climate and tectonics, influence sedimentary basin fills. In turn, sedimentary archives provide key information on variations in accommodation and sediment flux over time, which record paleoclimate and tectonic conditions. However, the impacts of accommodation and flux on sedimentation must be disentangled before understanding their specific influence on surface [...]
Long-term incubations reveal geochemical controls on wood biomass preservation at the anoxic sediment-water interface
Published: 2025-11-21
Subjects: Life Sciences
Ocean-based carbon dioxide removal (CDR) strategies increasingly consider biomass burial in anoxic marine basins as a pathway for long-term carbon storage. To evaluate its stability and environmental impact, we conducted 14-month bottle incubations testing three configurations of terrestrial wood under anoxic conditions: suspended in the water column, placed on the sediment surface, and buried [...]
Access to Monitoring Data Reduces Methane Intensity at Operational Oil and Gas Facilities
Published: 2025-11-21
Subjects: Environmental Monitoring, Oil, Gas, and Energy
Methane intensity is defined as methane gas emitted to the atmosphere per oil and gas product throughput at various steps in the supply chain. It is the standard metric used by industry stakeholders to assess methane emissions performance. Many studies have assessed the capabilities of methane emission measurement systems, but no studies have quantified the effect on methane intensity of oil and [...]