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Showing 451 to 500 of 5157 works

A first look at dissolved Ge isotopes in marine sediments

The removal of chemical species from seawater during the precipitation of authigenic minerals is difficult to constrain but may play a major role in the global biogeochemical cycl…

Probabilistic space- and time-interaction modeling of main-shock earthquake rupture occurrence

This paper presents a probabilistic formulation for modeling earthquake rupture processes of mainshocks. A correlated multivariate Bernoulli distribution is used to model rupture …

Terrestrial environmental change across the onset of the PETM and the associated impact on biomarker proxies: a caution…

The Paleocene-Eocene Thermal Maximum (PETM; ~ 56 million years ago (Ma) is the most severe carbon cycle perturbation event of the Cenozoic. Although the PETM is associated with wa…

A long-term, high-latitude record of Eocene hydrological change in the Greenland region

A range of proxy approaches have been used to reconstruct short-term changes to Earth’s hydrological cycle during the early Eocene hyperthermals. However, little is known about th…

Stratigraphy of Architectural Elements of a Buried Monogenetic Volcanic System and Implications for Geoenergy Explorati…

Large volumes of magma emplaced and deposited within sedimentary basins can have an impact on their architectural style and geological evolution. Over the last decade, continuous …

Application of multivariate statistical methods to hydrogeological property parameterisation from geotechnical and geop…

Hydrogeological data sets are often relatively sparse compared to the scale of investigation, resulting in degrees of uncertainty which, although constrained, may be considered as…

Bayesian parameter estimation for space and time interacting earthquake rupture model using historical and physics-base…

This paper presents a robust parameter estimation technique for a probabilistic earthquake hazard model that captures time and space interactions between earthquake mainshocks. Th…

Influence of dissolution on frictional properties of carbonate faults

Velocity stepping experiments have been performed on a simulated calcite gouge using an annular shear apparatus to investigate the effect of dissolution on the frictional properti…

A heuristic model inversion for coupled thermo-hydro-mechanical modeling of triaxial experiments

As multiphysics geomechanical models get developed, their increasing complexity and number of parameters make it particularly difficult to calibrate against experimental data. In …

Radiation Hazard evaluation and spatial dose rate mapping in mineralized region of Siwaliks: A case study from Una, Kan…

The following work is a part of wider uranium prospecting programme of the Atomic Mineral Directorate for Exploration and Research (AMD) for mapping radioactive anomalies in miner…

The Incredible Lightness of Water Vapor

The molar mass of water vapor is significantly less than that of dry air. This makes a moist parcel lighter than a dry parcel of the same temperature and pressure. This effect is …

A physics-based approach of deep interseismic creep for viscoelastic strike-slip earthquake cycle models

Most geodetic inversions of surface deformation rates consider the depth distribution of interseismic fault slip-rate to be time invariant. However, some numerical simulations sho…

The El Niño – La Niña cycle and recent trends in supply and demand of net primary productivity in African drylands

The role of El Niño-Southern Oscillation (ENSO) in the balance between supply and demand of net primary productivity (NPP) over Africa is unclear. Here, we analyze the impact of E…

Anomalous structure of MgCO3 liquid and the buoyancy of carbonatite melts

MgCO3 is one of the most important components of mantle-derived carbonatite melts, and yet also one of the most difficult to study experimentally. Attempts to constrain its thermo…

Impacts of Coal Resource Development on Surface Water Quality in a Multi-jurisdictional Watershed in the Western United…

This study focuses on water quality and quantity impacts from natural resource development on watersheds originating on Crow tribal lands in southeastern Montana. My field researc…

Field and LiDAR data observations of erosion on anthropogenic valley fills and associated landscape produced by mountai…

Mountaintop removal/valley fill coal mining (MTR/VF) in Central Appalachia has buried an estimated 4000 km of headwater streams, but the geomorphic implications of the constructed…

High-angular resolution electron backscatter diffraction as a new tool for mapping lattice distortion in geological min…

Analysis of distortions of the crystal lattice within individual mineral grains is central to the investigation of microscale processes that control and record tectonic events. Th…

Route Schematization With Polygonal Landmarks

GPS-based navigation devices use large-scale visualizations of the route, where the focus lies on turn instructions. Although efficient on the wayfinding task, this approach does …

A Scalable Algorithm for Cross-correlations of Compressed Ambient Seismic Noise

Companies and academic geophysicists are increasingly collecting continuous seismic data on denser arrays, and are looking to a variety of lossy compression methods to store and q…

Deeply buried ancient volcanoes control hydrocarbon migration in the South China Sea

Buried volcanoes are increasingly identified in the sedimentary basins both on lands and continental margins. However, their roles on the post-eruption fluid flows are still poorl…

Decomposition of Amino Acids in Water with Application to In-Situ Measurements of Enceladus, Europa and Other Hydrother…

To test the potential of using amino acid abundances as a biosignature at icy ocean worlds, we investigate whether primordial amino acids (accreted or formed by early aqueous proc…

Finite frequency inversion of cross-correlation amplitudes for ambient noise source directivity estimation

We present a new method for determining the azimuthal variation of ambient seismic noise sources, that combines the computational speed and simplicity of traditional approaches wi…

Efficient 3D large-scale forward-modeling and inversion of gravitational fields in spherical coordinates with applicati…

An efficient forward modeling algorithm for calculation of gravitational fields in spherical coordinates is developed for 3D large‐scale gravity inversion problems. 3D Gauss‐Legen…

Explaining long-range fluid pressure transients caused by oilfield wastewater disposal using the hydrogeologic principl…

Injection-induced earthquakes are now a regular occurrence across the midcontinent United States. This phenomenon is primarily caused by oilfield wastewater disposal into deep geo…

Are Detected Trends in Flood Magnitude and Shifts in the Timing of Floods of A Major River Basin in India, Linked To An…

Analyzing of trends in flood magnitude and the timing of the dates of flood occurrences of large river basins across the globe are essential for understanding changes in water ava…

The stratigraphic evolution of onlap in siliciclastic deep-water systems: Autogenic modulation of allogenic signals

Seafloor topography affects the sediment gravity flows that interact with it. Understanding this interaction is critical for accurate predictions of sediment distribution, paleoge…

Characterising strong force networks produced during granular shear using percolation methods: Revealing the bridge bet…

Faults, landslides and subglacial till often contain accumulations of granular debris. Their macroscopic motion is at least to some extent determined by the processes operating in…

What has Global Sensitivity Analysis ever done for us? A systematic review to support scientific advancement and to inf…

Computer models are essential tools in the earth system sciences. They underpin our search for understanding of earth system functioning and support decision- and policy-making ac…

Illuminating water cycle modifications and Earth System resilience in the Anthropocene

Fresh water – the bloodstream of the biosphere – is at the centre of the planetary drama of the Anthropocene. Water fluxes and stores regulate the Earth’s climate and are essentia…

Fast non-linear gravity inversion in spherical coordinates with application to the South American Moho

Estimating the relief of the Moho from gravity data is a computationally intensive non-linear inverse problem. What is more, the modeling must take the Earths curvature into accou…

Comment on “Earthquake-induced prompt gravity signals identified in dense array data in Japan” by Kimura et al.

A recent work by Kimura et al. (2019) (hereafter referred to as K19) claims to provide the first observational constraints on the prompt elastogravity signals (PEGS) induced by an…

Scaled Random Number Simulation of High Correlation Coefficients for Gasoline Range Compound Concentrations

It has been common practice to plot gasoline range parameters as absolute concentrations within crude oils of either single compounds, sums of compound pairs, or the square root o…

Comparison of estimation methods for a nonstationary index-flood model in flood frequency analysis using peaks over thr…

Accurate estimation of flood frequency is crucial for designing safe infrastructures. To reduce model uncertainty, threshold modeling techniques are often useful in bringing more …

Matlab/R workflows to assess critical choices in Global Sensitivity Analysis using the SAFE toolbox

Global Sensitivity Analysis (GSA) is a set of statistical techniques to investigate the effects of the uncertainty in the input factors of a mathematical model on the model’s outp…

The vulnerability of tidal flats and multi-channel estuaries to dredging and disposal

Shipping fairways in estuaries are continuously dredged to maintain access for large vessels to major ports. However, several estuaries worldwide show adverse side effects to dred…

Earthquake cycle modeling of the Cascadia subduction zone

The Cascadia subduction zone hosts great $\mathrm{M}_\mathrm{W} > 8.5$ earthquakes, but studying these events is hindered by our short observational record. Earthquake cycle si…

Dispersion, accumulation and the ultimate fate of microplastics in deep-marine environments: A review and future direct…

An estimated 8.3 billion tonnes of non-biodegradable plastic has been produced over the last 65 years. Much of this is not recycled and is disposed into the sedimentary system, ha…

Mapping geospatial processes affecting the environmental fate of agricultural pesticides in Africa

The application of agricultural pesticides in Africa has high negative effects on human health and the environment. To analyse the effect, spatial data characterizing the environm…

Determining cooling rates from mica 40Ar/39Ar thermochronology data: effect of cooling path shape

Tectonic models are commonly underpinned by metamorphic cooling rates derived from diffusive-loss thermochronology data. Such cooling ages are usually linked to temperature via Do…

Ridge Subduction and Afterslip Control Aftershock Distribution of the 2016 Mw 7.8 Ecuador Earthquake

We characterise the aftershock sequence following the 2016 Mw=7.8 Pedernales earthquake. More than 10,000 events were detected and located, with magnitudes up to 6.9. Most of the …

Boundary element methods for earthquake modeling with realistic 3D geometries

Boundary element methods have become a foundational tool in earthquake science for the modeling of earthquake cycle kinematics. Despite their wide use and convenience typical rect…

A global survey on the perceptions and impacts of gender inequality in the Earth and space sciences

The leaky pipeline phenomenon refers to the disproportionate decline of female scientists at higher academic career levels and is a major problem in the natural sciences. Identify…

A simplified seasonal forecasting strategy, applied to wind and solar power in Europe

We demonstrate levels of skill for forecasts of seasonal-mean wind speed and solar irradiance in Europe, using seasonal forecast systems available from the Copernicus Climate Chan…

The Cyclic Preservation of Clastic and Evaporitic Sabkha Sediments: Insights from the Cedar Mesa Sandstone Formation of…

The strata of arid continental basins commonly comprise evaporitic sediments deposited in sabkha settings combined with clastic sediments derived from aeolian, fluvial and/or lacu…

A macroscale hydrogeological numerical model of the Suio hydrothermal system (central Italy)

The complex behaviour of the Suio hydrothermal system (central Italy) and its potential exploitation as a renewable energy source are still unclear. To quantitatively evaluate th…

Observation and explanation of spurious seismic signals emerging in teleseismic noise correlations

Deep body waves have been reconstructed from seismic noise correlations in recent studies. The authors note their great potential for deep-Earth imaging. In addition to the expect…

Audit of Petroleum Exploration Wells in the UK Rockall Basin: 1980-2006

The UK Rockall Basin is one of the most underexplored areas of the UK Continental Shelf (UKCS) with only 12 exploration wells drilled since 1980, in a basin area that is equal in …

The flow of fresh groundwater and solutes to the world’s oceans and coastal ecosystems

The flow of fresh groundwater towards the world oceans may provide substantial inputs of nutrients and solutes to the oceans. Here we present a spatially resolved global model of …

Minimal surfaces in porous media: pore-scale imaging of multiphase flow in an altered-wettability Bentheimer sandstone

We observed features of pore scale fluid distributions during oil-brine displacement in a mixed-wet sandstone rock sample. High-resolution X-ray imaging was used in combination w…

Comment on “Long-term strain oscillations related to the hydrogeological interaction between aquifers in intra-mountain…

The paper by Devoti et al. (2018) analyses the GPS time series from seventeen stations located inside and in the neighboring of the L’Aquila intermountain basin. The authors sugge…

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