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Showing 4901 to 4950 of 5157 works
A faithful record of channel mouth bifurcation angles in river delta stratigraphy on Earth and Mars
Which geomorphologic features of sedimentary systems persist into the stratigraphic record? In modern river deltas, channel mouth bifurcation angles have been shown to be consiste…
Tracking Groundwater Levels using the Ambient Seismic Field
Aquifers are vital groundwater reservoirs for residential, agricultural, and industrial activities worldwide. Tracking their state with high temporal and spatial resolution is cri…
What caused Earths largest mass extinction event? New evidence from the Permian-Triassic boundary in northeastern Utah
The discovery of a Permian-Triassic boundary section in northeastern Utah reveals a detailed record of events that led to one of the greatest mass extinctions on the planet. From …
Probing earthquake dynamics through seismic radiated energy rate: illustration with the M7.8 2015 Nepal earthquake
Dynamic characterizations of earthquakes focus on whole-event representations, that is whether the total radiation of seismic waves is more or less energetic. Denolle et al (2015)…
Bootstrapped high quantile estimation --- An experiment with scarce precipitation data
This paper details team SUTD’s effort when participating in the “Prediction of extremal precipitation” challenge. We propose a framework that combines the generalized Pareto distr…
Structure and kinematics of the Sumatran Fault System in North Sumatra (Indonesia)
Lithospheric-scale faults related to oblique subduction are responsible for some of the most hazardous earthquakes reported worldwide. The mega-thrust in the Sunda sector of the S…
Groundwater controls on post-fire permafrost thaw: Water and energy balance effects
Fire frequency and severity are increasing in high latitude regions, but the degree to which groundwater flow impacts the response of permafrost to fire remains poorly understood.…
The new CLOCIT irradiation facility for 40Ar/39Ar geochronology: Characterization, comparison with CLICIT, and implicat…
The Cadmium-Lined Outer-Core Irradiation Tube (CLOCIT) is a new irradiation facility for 40Ar/39Ar geochronology at the Oregon State University TRIGA® reactor. We report fluence p…
Empirical relationship between river slope and the elongation of bars in braided rivers: a potential tool for paleoslop…
Paleoslope of ancient river systems is a fundamental parameter needed to reconstruct paleohydrology and paleoclimate from the fluvial sedimentary record. The shape of braid bars i…
The impact of supercritical fluids on volcanic eruptions: Linking volatile exsolution and the state change in Deccan vo…
This research outlines a sequence of events that may help explain the observed state change in Deccan volcanism about 66 million years ago. Two mantle plumes may have created a re…
Active deformation of Malawi Rift’s North Basin hinge zone modulated by reactivation of pre-existing Precambrian shear …
Key Points: 1. Filtered aeromagnetic data elucidates the relationship between earthquake surface ruptures and buried faults along the North Basin hinge-zone, Malawi Rift. 2. Fault…
Fracture patterns associated with the evolution of the Teton anticline, Sawtooth Range, Montana, USA
The Teton anticline and adjacent structures at the deformation front of the Sawtooth Range fold-thrust belt in Montana are fractured in such a way that some have used these as a m…
On the reduction of trend errors by the ANOVA joint correction scheme used in homogenization of climate station records
Inhomogeneities in climate data are the main source of uncertainty for secular warming estimates. To reduce the influence of inhomogeneities in station data statistical homogeniza…
Aggradational lobe fringes: the influence of subtle intrabasinal seabed topography on sediment gravity flow processes a…
Seabed topography is ubiquitous across basin-floor environments, and influences sediment gravity flows and sediment dispersal patterns. The impact of steep (several degrees) confi…
Multi-scale modeling of the urban meteorology: integration of a new canopy model in the WRF model
Urban parametrizations have been recently proposed and integrated in mesoscale meteorological models for a better reproduction of urban heat islands and to compute building energy…
Global assessment and mapping of changes in mesoscale landscapes: 1992–2015
Monitoring global land cover changes is important because of concerns about their impact on environment and climate. The release by the European Space Agency (ESA) of a set of wor…
Towards machine ecoregionalization of Earth’s landmass using pattern segmentation method
We present and evaluate a quantitative method for delineation of ecophysigraphic regions throughout the entire terrestrial landmass. The method uses the new pattern-based segmenta…
Global inventory of landscape patterns and latent variables of landscape spatial configuration
We present a regionalization of the entire Earth’s landmass into land units of homogeneous landscape patterns. The input to the regionalization is a high resolution Global Land Co…
Outcrop-scale tomography: insights into the 3D structure of multiphase boudins
We analyze the 3D geomorphology of a boudinaged amphibolite layer encased in marble using meter-scale tomography by serial sectioning, high resolution imaging and 3D reconstructio…
What is users next best alternative to the use of dynamical seasonal predictions?
The recent development of climate predictions has shown their potential in providing users with information that could be used to inform decision on a seasonal time-horizon. This …
Application of discrete-element methods to approximate sea-ice dynamics
Lagrangian models of sea-ice dynamics have several advantages over Eulerian continuum models. Spatial discretization on the ice-floe scale are natural for Lagrangian models and of…
Erosion-initiated stromatolite formation in a recent hypersaline sabkha setting (Abu Dhabi, United Arab Emirates)
Laminated microbial mats and microbialites are documented from a variety of coastal marine environments. These features form through: a) the combination of trapping and binding of…
Selection of hydrological signatures for large-sample hydrology
Hydrological signatures are now used for a wide range of purposes, including catchment classification, process exploration and hydrological model calibration. The recent boost in …
Overview to the Regional Thrust Wedge Tectonics in Indonesia: Similarities and Differences in Orogenic Belts
Overview to the regional thrust wedge tectonics in Indonesia attempts to compile and review geologic settings related to the development of compressive structures. Comprehensive o…
Distributions of geohopanoids in peat: implications for the use of hopanoid-based proxies in natural archives
Hopanoids are pentacyclic triterpenoids produced by a wide range of bacteria. Within modern settings, hopanoids mostly occur in the biological 17β,21β(H) configuration. However, i…
An estimate of equilibrium climate sensitivity from interannual variability
Estimating the equilibrium climate sensitivity (ECS; the equilibrium warming in response to a doubling of CO2) from observations is one of the big problems in climate science. Usi…
Description of the COST - HOME monthly benchmark dataset and the submitted homogenized contributions
As part of the COST Action HOME a dataset has been generated that will serve as a benchmark for homogenisation algorithms. Members of the Action and third parties have been invite…
Groundwater pumping impacts on real stream networks: testing the performance of simple management tools
Quantifying reductions in streamflow due to groundwater pumping (‘streamflow depletion’) is essential for conjunctive management of groundwater and surface water resources. Analyt…
The stratigraphy and eruptive history of the Palaeogene Arran Volcanic Formation, western Scotland: a proximal record o…
Caldera-forming volcanic eruptions are among the most dangerous, and can generate extensive pyroclastic deposits and deliver ash into global atmospheric circulation systems. As ca…
Rift-related magmatism influences petroleum systems development in the NE Irish Rockall Basin, offshore Ireland
Large volumes of hydrocarbons reside in volcanically influenced sedimentary basins. Despite having a good conceptual understanding of how magmatism impacts the petroleum system of…
Multi-scale segmentation algorithm for pattern-based partitioning of large categorical rasters
Analyzing large Earth Observation (EO) data on the broad spatial scales frequently involves regionalization of patterns. To automate this process we present a segmentation algorit…
Volume And Recurrence of Submarine-Fan-Building Turbidity Currents
(now published in "The Depositional Record") Submarine fans are archives of Earth-surface processes and change, recording information about the turbidity currents that construct …
Facies architecture of submarine channel deposits on the western Niger Delta slope: Implications for grain-size and den…
High-resolution bathymetry, seismic reflection, and piston core data from a submarine channel on the western Niger Delta slope demonstrate that thick, coarse-grained, amalgamated …
High Resolution, Millennial-Scale Patterns of Bed Compensation on a Sand-Rich Intraslope Submarine Fan, Western Niger D…
Near-seafloor core and seismic-reflection data from the western Niger Delta continental slope document the facies, architecture, and evolution of submarine channel and intraslope …
Comparing submarine and fluvial channel kinematics: Implications for stratigraphic architecture
Submarine and fluvial channels exhibit qualitatively similar geomorphic patterns, yet produce very different stratigraphic records. We reconcile these seemingly contradictory obse…
Rapid Adjustment of Submarine Channel Architecture to Changes in Sediment Supply
Changes in sediment supply and caliber during the last ~130 ka have resulted in a complex architectural evolution of the Y channel system on the western Niger Delta slope. This ev…
Climbing Ripple Successions in Turbidite Systems: Depositional Environments, Sedimentation Rates, and Accumulation Times
Climbing-ripple cross-lamination (CRCL) is most commonly deposited by turbidity currents when suspended load fallout and bedload transport occur contemporaneously. The angle of ri…
Impacts of land-use and land-cover change on stream hydrochemistry in the Cerrado and Amazon biomes
Studies on the impacts of land-use and land-cover change on stream hydrochemistry in active deforestation zones of the Amazon agricultural frontier are limited and have often used…
Macrostrat: a platform for geological data integration and deep-time Earth crust research
Characterizing the lithology, age, and physical-chemical properties of rocks and sediments in the Earths upper crust is necessary to fully assess energy, water, and mineral resour…
Detecting orogenic wedge state and the rise of the External Alps by detrital thermochronology
Critical taper theory permits the modelling of an orogenic wedge as a single mechanical entity. However, although shallow-crustal orogens dominated by brittle failure have been su…
The role of H2O on the extraction of melt from crystallising magmas
The segregation and accumulation of felsic melts, from crystallising crustal magma reservoirs, is essential for the chemical evolution of the crust and is a phenomenon preceding s…
Two Fundamentally Different Types of Submarine Canyons Along the Continental Margin of Equatorial Guinea
Most submarine canyons are erosive conduits cut deeply into the world’s continental shelves through which sediment is transported from areas of high coastal sediment supply onto l…
Facies and Architectural Asymmetry in a Conglomerate-Rich Submarine Channel Fill, Cerro Toro Formation, Sierra Del Toro…
Cross-sectional asymmetry is characteristic of sinuous channels, in both fluvial and submarine settings. Less well documented are the facies distributions of asymmetric channels, …
Salt thickness and composition influence rift structural style, northern North Sea, offshore Norway
‘Salt’ giants are typically halite-dominated, although they invariably contain other evaporite (e.g. anhydrite, bittern salts) and non-evaporite (e.g. carbonate, clastic) rocks. R…
Prediction of wave ripple characteristics using genetic programming
We integrate published data sets of field and laboratory experiments of wave ripples and use genetic programming, a machine learning paradigm, in an attempt to develop a universal…
How do normal faults grow?
Normal faults grow via synchronous increase in displacement and length (‘propagating fault model’, also known as the ‘isolated fault model’), or by rapid length establishment and …
Late Paleozoic Iberian orocline(s) and the missing shortening in the core of Pangea. Paleomagnetism from the Iberian Ra…
Supercontinents are usually interpreted to be single and rigid continental plates. How and when Pangea became a rigid supercontinent is disputed, and age estimations vary from ~33…
Drought Conditions Maximize the Impact of High-Frequency Flow Variations on Thermal Regimes and Biogeochemical Function…
Anthropogenic activities, especially dam operations, often induce larger and more frequent stage fluctuations than those occurring in natural rivers. However, long-term impacts of…
Depositional processes, bedform development and hybrid bed formation in rapidly decelerated cohesive (mud–sand) sedimen…
Flows with high suspended sediment concentrations are common in many sedimentary environments, and their flow properties may show a transitional behaviour between fully turbulent …
A phase diagram for turbulent, transitional and laminar clay suspension flows
New phase diagrams for the dynamic structure of clay-laden open-channel flows are proposed. These diagrams can be used to distinguish between turbulent Newtonian, transitional, an…
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