Latest in physics.geo-ph

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Zinc isotope analyses of singularly small samples (<5 ng Zn): investigating chondrule-matrix complementarity in LeovilleJul 15 2019The potential complementarity between chondrules and matrix of chondrites, the Solar System's building blocks, is still a highly debated subject. Complementary superchrondritic compositions of chondrite matrices and subchondritic chondrules may point ... More
Wetting-phase relative permeability in porous media with bi-modal pore size distributionsJul 13 2019Modeling fluid flow in dual-porosity media with bi-modal pore size distributions has practical applications to understanding transport in multi-scale systems such as natural soils. Dual-porosity media are typically formed of two domains: (1) structure ... More
Soil and soil CO2 magnify greenhouse effectJul 13 2019Soil has been recognized as an indirect driver of global warming by regulating atmospheric greenhouse gases. However, in view of the higher heat capacity and CO2 concentration in soil than those in atmosphere, the direct contributions of soil to greenhouse ... More
A scalar radiative transfer model including the coupling between surface and body wavesJul 12 2019To describe the energy transport in the seismic coda, we introduce a system of radiative transfer equations for coupled surface and body waves in a scalar approximation. Our model is based on the Helmholtz equation in a half-space geometry with mixed ... More
A paradigm for developing earthquake probability forecasts based on geoelectric dataJul 12 2019We examine the precursory behavior of geoelectric signals before large earthquakes by means of an algorithm including an alarm-based model and binary classification. This algorithm, introduced originally by Chen and Chen [Nat. Hazards., 84, 2016], is ... More
Estimating tropospheric and stratospheric winds using infrasound from explosionsJul 12 2019The receiver-to-source backazimuth of atmospheric infrasound signals is biased when cross-winds are present along the propagation path. Infrasound from 598 surface explosions from over 30 years in northern Finland is measured with high spatial resolution ... More
Statistical Measures and Selective Decay Principle for Generalized Euler DynamicsJul 11 2019We investigate the statistical mechanics of a family of two dimensional (2D) fluid flows, described by the generalized Euler equations, or {\alpha}-models. We aim to study the equilibrium mechanics, using initially a point-vortex approximation and then ... More
A generalized theory for full microtremor horizontal-to-vertical [H/V (z, f)] spectral ratio interpretation in offshore and onshore environmentsJul 10 2019Advances in the field of seismic interferometry have provided a basic theoretical interpretation to the full spectrum of the microtremor horizontal-to-vertical spectral ratio [H/V(f)]. The interpretation has been applied to ambient seismic noise data ... More
The emergence of crack-like behavior of frictional rupture: Edge singularity and energy balanceJul 09 2019The failure of frictional interfaces --- the process of frictional rupture --- is widely assumed to feature crack-like properties, with far-reaching implications for various disciplines, ranging from engineering tribology to earthquake physics. A necessary ... More
Triple singularities of elastic wave propagation in anisotropic mediaJul 09 2019A typical singularity of elastic wave propagation, often termed a shear-wave singularity, takes place when the Christoffel equation has a double root or, equivalently, two out of three slowness or phase-velocity sheets share a common point. We examine ... More
Earthquake Response Analysis of Yielding Structures Coupled with Rocking WallsJul 08 2019This paper investigates the inelastic response of a yielding structure coupled with a rocking wall which can be vertically restrained. The paper first derives the nonlinear equations of motion of a yielding oscillator coupled with a vertically restrained ... More
Stacked autoencoders based machine learning for noise reduction and signal reconstruction in geophysical dataJul 07 2019Autoencoders are neural network formulations where the input and output of the network are identical and the goal is to identify the hidden representation in the provided datasets. Generally, autoencoders project the data nonlinearly onto a lower dimensional ... More
An investigation on the effect of the near-fault earthquakes on the seismic behavior of RC moment resisting frames (MRFs) designed based on Iranian seismic code (Standard No. 2800)Jul 07 2019Past severe earthquakes, such as Bam earthquake of 2003 and Tabas earthquake of 1978, have demonstrated that many cities in Iran are prone to be struck by near-fault earthquakes. Such earthquakes are impulsive in nature, and therefore, they are more destructive ... More
Mapping PM2.5 concentration at sub-km level resolution: a dual-scale retrieval methodJul 06 2019Satellite-based retrieval has become a popular PM2.5 monitoring method currently. To improve the retrieval performance, multiple variables are usually introduced as auxiliary variable in addition to aerosol optical depth (AOD). Different kinds of variables ... More
Study of methane hydrate formation and self-preservation using in-situ X-ray synchrotron tomographyJul 06 2019This paper reports results of the synchrotron-based tomography experiments for studying the methane-hydrate formation/decomposition in sand samples. Fast scanning times (70 secs) provided successive images (every 2-15 min) for a detailed study of these ... More
Periodic outgassing as a result of unsteady convection in Ray Lava Lake, Mount Erebus, AntarcticaJul 05 2019Persistently active lava lakes show continuous outgassing and open convection over years to decades. Ray Lake, the lava lake at Mount Erebus, Ross Island, Antarctica, maintains long-term, near steady-state behavior in temperature, heat flux, gas flux, ... More
A stable discontinuous Galerkin method for linear elastodynamics in geometrically complex media using physics based numerical fluxesJul 05 2019High order accurate and explicit time-stable solvers are well suited for hyperbolic wave propagation problems. For the complexities of real geometries, internal interfaces, nonlinear boundary and interface conditions, discontinuities and sharp wave fronts ... More
Rotational dynamics of planetary cores: instabilities driven by precession, libration and tidesJul 03 2019In this chapter, we explore how gravitational interactions drive turbulent flows inside planetary cores and provide an interesting alternative to convection to explain dynamo action and magnetic fields around terrestrial bodies. In the first section, ... More
Mass transport for Pollard wavesJul 03 2019We provide an in-depth exploration of the mass-transport properties of Pollard's exact solution for a zonally-propagating surface water-wave in infinite depth. Without resorting to approximations we discuss the Eulerian mass transport of this fully nonlinear, ... More
Large presence of carbonic acid in CO$_2$-rich aqueous fluids under Earth's mantle conditionsJul 03 2019The chemistry of carbon in aqueous fluids at extreme pressure and temperature conditions is of great importance to Earth's deep carbon cycle, which substantially affects the carbon budget at Earth's surface and global climate change. At ambient conditions, ... More
Seismic data denoising and deblending using deep learningJul 02 2019An important step of seismic data processing is removing noise, including interference due to simultaneous and blended sources, from the recorded data. Traditional methods are time-consuming to apply as they often require manual choosing of parameters ... More
The onset of thermo-compositional convection in rotating spherical shellsJul 02 2019Double-diffusive convection driven by both thermal and compositional buoyancy in a rotating spherical shell can exhibit a rather large number of behaviours often distinct from that of the single diffusive system. In order to understand how the differences ... More
Learning Argo Profiles by using the Signature MethodJun 30 2019A profile from the Argo ocean observing array is a sequence of three-dimensional vectors composed of pressure, salinity, and temperature, appearing as a continuous curve in three-dimensional space.The shape of such curve is faithfully represented by a ... More
Directivity Modes of Earthquake Populations with Unsupervised LearningJun 30 2019We present a novel approach for resolving modes of rupture directivity in large populations of earthquakes. A seismic spectral decomposition technique is used to first produce relative measurements of radiated energy for earthquakes in a spatially-compact ... More
Vorstoss und Rückzug der Gletscher während der Kleinen EiszeitJun 29 2019The Little Ice Age in Europe (between about 1350 and 1850) marked the largest glacier extent over the entire Holocene period. Although several authors have investigated the causes of the substantial glacier advances in the mid-19th century and the rapid ... More
On orbit performance of the GRACE Follow-On Laser Ranging InterferometerJun 28 2019The Laser Ranging Interferometer (LRI) instrument on the Gravity Recovery and Climate Experiment (GRACE) Follow-On mission has provided the first laser interferometric range measurements between remote spacecraft, separated by approximately 220 km. Autonomous ... More
Role of radon as a precursor to earthquakes:An appraisalJun 27 2019Radon monitoring has recently gained extensive attention among seismologists. It is now widely reported as a precursssory signal prior to occurrence of a seismic event. The enhanced estimation of radon in soil gas is basically attributed to the strain ... More
Seismic Moment and Recurrence: Microstructural and mineralogical characterization of rocks in carbonate fault zones and their potential for luminescence and ESR datingJun 27 2019The important question of absolute dating of seismic phenomena has been the study of several researchers over the past few decades. The relevant research has concentrated on 'energy traps' of minerals, such as quartz or feldspar, which may accumulate ... More
The emergence of crack-like behavior of frictional rupture: The origin of stress dropsJun 27 2019The failure of frictional interfaces - the process of frictional rupture - is widely assumed to feature crack-like properties, with far-reaching implications for various disciplines, ranging from engineering tribology to earthquake physics. Yet, how the ... More
Probabilistic Neural-Network Based 2D Travel Time TomographyJun 27 2019Travel time tomography for the velocity structure of a medium is a highly non-linear and non-unique inverse problem. Monte Carlo methods are becoming increasingly common choices to provide probabilistic solutions to tomographic problems but those methods ... More
Improving the use of the randomized singular value decomposition for the inversion of gravity and magnetic dataJun 26 2019The large-scale focusing inversion of gravity and magnetic potential field data using $L_1$-norm regularization is considered. The use of the randomized singular value decomposition methodology facilitates tackling the computational challenge that arises ... More
Drift of pancake ice floes in the winter Antarctic marginal ice zone during polar cyclonesJun 26 2019High temporal resolution in--situ measurements of pancake ice drift are presented, from a pair of buoys deployed on floes in the Antarctic marginal ice zone during the winter sea ice expansion, over nine days in which the region was impacted by four polar ... More
Early formation of moons around large trans-Neptunian objects via giant impactsJun 26 2019Recent studies have revealed that all large (over 1000 km in diameter) trans-Neptunian objects (TNOs) form satellite systems. Although the largest Plutonian satellite, Charon, is thought to be an intact fragment of an impactor directly formed via a giant ... More
A Rayleigh-Ritz method based approach to computing seismic normal modes in the presence of an essential spectrumJun 25 2019A Rayleigh-Ritz with Continuous Galerkin method based approach is presented to compute the normal modes of a planet in the presence of an essential spectrum. The essential spectrum is associated with a liquid outer core. The presence of a liquid outer ... More
Introducing a response-based duration metric and its correlation with structural damagesJun 25 2019This study proposes a response-based parameter for strong motion duration which is computed for structures and is the total time they are nonlinear during an earthquake. Correlation between structural response and duration for structures, subjected to ... More
Viscous fingering in fractured porous mediaJun 25 2019The effect of heterogeneities induced by highly permeable fracture networks on viscous miscible fingering in porous media is examined using high-resolution numerical simulations. We consider the planar injection of a less viscous fluid into a two-dimensional ... More
On relations of anisotropy and linear inhomogeneity using Backus averageJun 24 2019The anisotropy of an equivalent medium resulting from the Backus (1962) average is induced by the vertical inhomogeneity among its constituent layers. The velocity field of the constituent isotropic layers increases linearly with depth, which is assumed ... More
Bayesian waveform-based calibration of high-pressure acoustic emission systems with ball drop measurementsJun 24 2019Acoustic emission (AE) is a widely used technology to study source mechanisms and material properties during high-pressure rock failure experiments. It is important to understand the physical quantities that acoustic emission sensors measure, as well ... More
Effective drag of a rod in fluid-saturated granular bedsJun 24 2019We measure the drag encountered by a vertically oriented rod moving across a sedimented granular bed immersed in a fluid under steady-state conditions. At low rod speeds, the presence of the fluid leads to a lower drag because of buoyancy, whereas a significantly ... More
Removing numerical dispersion from linear evolution equationsJun 22 2019In this paper we describe a method for removing the numerical errors in the modeling of linear evolution equations that are caused by approximating the time derivative by a finite difference operator. We prove that the method results in a solution with ... More
Uncertainty in the Predictive Capability of Detectors that Process Waveforms from ExplosionsJun 21 2019Explosions near ground generate multiple geophysical waveforms in the radiation-dominated range of their signature fields. Multi-phenomological explosion monitoring (MultiPEM) at these ranges requires the predictive capability to forecast trigger rates ... More
$^{81}$Kr dating at the Guliya ice cap, Tibetan PlateauJun 21 2019We present radiometric $^{81}$Kr dating results for ice samples collected at the outlets of the Guliya ice cap in the western Kunlun Mountains of the Tibetan Plateau. This first application of $^{81}$Kr dating on mid-latitude glacier ice was made possible ... More
Formation of stable aggregates by fluid-assembled solid bridgesJun 20 2019Jul 03 2019When a colloidal suspension is dried, capillary pressure may overwhelm repulsive electrostatic forces, assembling aggregates that are out of thermal equilibrium. This poorly understood process confers cohesive strength to many geological and industrial ... More
Formation of stable aggregates by fluid-assembled solid bridgesJun 20 2019Particle aggregation builds soils, biological structures, and many industrial and pharmaceutical products. Existing theories can explain aggregation in colloidal suspensions that results from interfacial electrostatic forces. When a suspension is dried, ... More
Rough Subducting Seafloor Reduces Interseismic Coupling and Mega-Earthquake Occurrence: Insights From Analogue ModelsJun 20 2019The roughness of the subduction interface is thought to influence seismogenic behavior in subduction zones, but a detailed understanding of how such roughness affects the state of stress along the subduction megathrust is still debated. Here, we use seismotectonic ... More
Simulating the influence of sea-surface-temperature (SST) on tropical cyclones over South-West Indian ocean, using the UEMS-WRF regional climate modelJun 19 2019Tropical cyclones remain a major threat to the lives, property and economy of communities around the South West Indian ocean (SWIO), notably Southern Africa and Madagascar. This study uses the weather research forecast (WRF) model to perform a series ... More
Deep learning slow earthquakes in Cascadia and universal frictional characteristicsJun 19 2019Slow earthquakes and associated tremor are common to most subduction zones, taking place down dip from the neighboring locked zone where megathrust earthquakes occur. We report observation of quasi-continuous tremor that quantifies the slow slip rate ... More
Interevent time distributions of avalanche dynamicsJun 19 2019Physical systems characterized by stick-slip dynamics often display avalanches. Regardless of the diversity of their microscopic structure, these systems are governed by a power-law distribution of avalanche size and duration. Here we focus on the interevent ... More
Multi-analytical characterization of Fe-rich magnetic inclusions in diamondsJun 18 2019Magnetic mineral inclusions, as iron oxides or sulfides, occur quite rarely in natural diamonds. Nonetheless, they represent a key tool not only to unveil the conditions of formation of host diamonds, but also to get hints about the paleointensity of ... More
Multi-analytical characterization of Fe-rich magnetic inclusions in diamondsJun 18 2019Jul 05 2019Magnetic mineral inclusions, as iron oxides or sulfides, occur quite rarely in natural diamonds. Nonetheless, they represent a key tool not only to unveil the conditions of formation of host diamonds, but also to get hints about the paleointensity of ... More
3D Prestack Fourier Mixed-Domain (FMD) depth migration for VTI media with large lateral contrastsJun 18 2019Although many 3D One-Way Wave-equation Migration (OWEM) methods exist for VTI media, most of them struggle either with the stability, the anisotropic noise or the computational cost. In this paper we present a new method based on a mixed space- and wavenumber-propagator ... More
How is density compensation created in the ocean mixed layer?Jun 18 2019This study examines the impact of turbulent mixing on horizontal density compensation in the upper ocean. A series of simulations model the role of mixing in scenarios initialized with geostrophically-adjusted compensated and uncompensated thermohaline ... More
The topological origin of anomalous transport: Persistence of $β$ in the face of varying correlation lengthJun 17 2019Traditional concepts for flow in porous media assume that the heterogenous distribution of hydraulic conductivity is the source for the contaminant temporal and spatial heavy tail, a process known as anomalous or non-Fickian transport; this anomalous ... More
Mesoscale analytical investigations of fluid-solid interaction: Liquid slip flow in a parallel-plate microchannelJun 16 2019Liquid slip flow with the Knudsen number (Kn) of 0.001-0.1 plays a dominated role in microfluidic devices and tight porous media. Its physical origin can be attributed to the intermolecular fluid-solid (F-S) interaction force, which has never been theoretically ... More
The transition to the ultimate regime of thermal convection from a stochastic one-dimensional turbulence perspectiveJun 15 2019The Rayleigh number $Ra$ dependence of the Nusselt number $Nu$ in turbulent Rayleigh--B\'enard convection is numerically investigated for a moderate and low Prandtl number, $Pr=0.7$ and $0.021$, respectively. Here we specifically address the case of a ... More
Machine Learning Approach to Earthquake Rupture DynamicsJun 14 2019Simulating dynamic rupture propagation is challenging due to the uncertainties involved in the underlying physics of fault slip, stress conditions, and frictional properties of the fault. A trial and error approach is often used to determine the unknown ... More
Transpiration- and precipitation-induced subsurface water flow observed using the self-potential methodJun 14 2019Movement of soil moisture associated with tree root-water uptake is ecologically important, but technically challenging to measure. Here, the self-potential (SP) method, a passive electrical geophysical method, is used to characterize water flow in situ. ... More
The application of muon tomography to the imaging of railway tunnelsJun 13 2019Cosmic Ray Muon Radiography utilizes highly-penetrating cosmic ray muons to image the density profile of an object of interest. Here we report on the first trial to use a portable field-deployable cosmic ray tracking system in order to image the whole ... More
Efficient Method for Updating IDF Curves to Future Climate ProjectionsJun 11 2019If climate stationarity is dead, how should engineering design standards be modified to account for potential changes in extreme precipitation? Many standards rely on precipitation intensity-duration-frequency (IDF) curves provided in NOAA's Atlas 14. ... More
The effect of geometry parameters and flow characteristics on erosion and sedimentation in channels junction using finite volume methodJun 11 2019One of the most critical problems in the river engineering field is scouring, sedimentation and morphology of a river bed. In this paper, a finite volume method FORTRAN code is provided and used. The code is able to model the sedimentation. The flow and ... More
Spectral fluctuation analysis of ionospheric inhomogeneities over Brazilian territory Part II: E-F valley region plasma instabilitiesJun 10 2019The turbulent-like process associated with ionospheric instabilities, has been identified as the main nonlinear process that drives the irregularities observed in the different ionospheric regions. In this complementary study, as proposed in the first ... More
Growth Model Interpretation of Planet Size DistributionJun 10 2019The radii and orbital periods of 4000+ confirmed/candidate exoplanets have been precisely measured by the Kepler mission. The radii show a bimodal distribution, with two peaks corresponding to smaller planets (likely rocky) and larger intermediate-size ... More
Devolatilization of Subducting Slabs, Part II: Volatile Fluxes and StorageJun 08 2019Subduction is a crucial part of the long-term H$_2$O and CO$_2$ cycling between Earth's exosphere and interior. However, there is broad disagreement over how much H$_2$O and CO$_2$ is liberated from subducting slabs to mantle wedge and transported to ... More
Self-induced Scattering of Strahl Electrons in the Solar WindJun 06 2019We investigate the scattering of strahl electrons by micro-instabilities as a mechanism for creating the electron halo in the solar wind. We develop a mathematical framework for the description of electron-driven micro-instabilities and discuss the associated ... More
Devolatilization of Subducting Slabs, Part I: Thermodynamic Parameterization and Open System EffectsJun 06 2019The amount of H$_2$O and CO$_2$ that is carried into deep mantle by subduction beyond subarc depths is debated. Given the large uncertainties surrounding the spatio-temporal pattern of fluid flow and the equilibrium state within subducting slabs, a model ... More
Estimation of Acoustic Impedance from Seismic Data using Temporal Convolutional NetworkJun 06 2019In exploration seismology, seismic inversion refers to the process of inferring physical properties of the subsurface from seismic data. Knowledge of physical properties can prove helpful in identifying key structures in the subsurface for hydrocarbon ... More
Micromechanics of high pressure compaction in granular quartz aggregatesJun 06 2019The mechanical behaviour of porous sandstones is generally modelled using concepts from granular mechanics, often overlooking the effect of cementation. To probe the key differences between sand and sandstone mechanics, we performed triaxial deformation ... More
Learning to regularize with a variational autoencoder for hydrologic inverse analysisJun 06 2019Inverse problems often involve matching observational data using a physical model that takes a large number of parameters as input. These problems tend to be under-constrained and require regularization to impose additional structure on the solution in ... More
Turbulent convection and high-frequency internal wave details in 1-m shallow watersJun 05 2019Vertically 0.042-m-spaced moored high-resolution temperature sensors are used for detailed internal wave-turbulence monitoring near Texel North Sea and Wadden Sea beaches on calm summer days. In the maximum 2 m deep waters irregular internal waves are ... More
Large-scale Inversion of Subsurface Flow Using Discrete Adjoint MethodJun 03 2019Sensitivity analysis plays an important role in searching for constitutive parameters (e.g. permeability) subsurface flow simulations. The mathematics behind is to solve a dynamic constrained optimization problem. Traditional methods like finite difference ... More
THMC instabilities and the Multiphysics of EarthquakesJun 03 2019Theoretical approaches to earthquake instabilities propose shear dominated instabilities as a source mechanism. Here we take a fresh look at the role of possible volumetric instabilities preceding a shear instability. We investigate the phenomena that ... More
NMO-velocity surfaces and Dix-type formulae in anisotropic heterogeneous mediaJun 01 2019Reflection moveout of pure modes recorded on conventional-length spreads is described by a normal-moveout (NMO) velocity that depends on the orientation of the common-midpoint (CMP) line. Here, we introduce the concept of NMO-velocity surfaces, obtained ... More
Semi-supervised Learning for Acoustic Impedance InversionMay 31 2019Recent applications of deep learning in the seismic domain have shown great potential in different areas such as inversion and interpretation. Deep learning algorithms, in general, require tremendous amounts of labeled data to train properly. To overcome ... More
Changes in long-term properties of the Danube river level and flow induced by dammingMay 30 2019In this paper we assessed changes in scaling properties of the river Danube level and flow data, associated with building of Djerdap/Iron Gates hydrological power plants positioned on the border of Romania and Serbia. We used detrended fluctuation analysis ... More
An all-at-once Newton strategy for methane hydrate reservoir modelsMay 30 2019Marine gas hydrate systems are characterized by highly dynamic transport-reaction processes in an essentially water-saturated porous medium that are coupled to thermodynamic phase transitions between solid gas hydrates, free gas and dissolved methane ... More
Towards automatically building starting models for full-waveform inversion using global optimization methods: A PSO approach via DEAP + DevitoMay 30 2019In this work, we illustrate an example of estimating the macro-model of velocities in the subsurface through the use of global optimization methods (GOMs). The optimization problem is solved using DEAP (Distributed Evolutionary Algorithms in Python) and ... More
Complex-valued neural networks for machine learning on non-stationary physical dataMay 29 2019Deep learning has become an area of interest in most scientific areas, including physical sciences. Modern networks apply real-valued transformations on the data. Particularly, convolutions in convolutional neural networks discard phase information entirely. ... More
Taylor-Proudman theorems in $\mathbb{E}^{3,4\ and\ 5}$May 28 2019Taylor's circulation-invariance proof of the theorem after Proudman is reinstated in the new derivation in $\mathbb{E}^3$ and in the Taylor-Proudman-type theorems in $\mathbb{E}^{5}$ and $\mathbb{E}^4$. The generalized Kelvin theorem for the higher-order ... More
Evaluation of mineralogy per geological layers by Approximate Bayesian ComputationMay 28 2019We propose a new methodology to perform mineralogic inversion from wellbore logs based on a Bayesian linear regression model. Our method essentially relies on three steps. The first step makes use of Approximate Bayesian Computation (ABC) and selects ... More
Synthesis and Compression study of orthorhombic $Fe_7(C,Si)_3$: A possible constituent of the Earth's coreMay 27 2019Orthorhombic phase of $Si$-doped $Fe$ carbide is synthesized at high pressures and temperatures using laser-heated diamond anvil cell ($LHDAC$), followed by its characterization using Transmission Electron Microscopy ($TEM$), Raman spectroscopy, and X-ray ... More
EPCI: A New Tool for Predicting Absolute Permeability from CT imagesMay 25 2019A new and fast Matlab algorithm for predicting absolute permeability is presented. The developed tool relies on measuring the connectivity of pores in a given three-dimensional (3D) micro-CT rock image. An index of pore connectivity is introduced. After ... More
Fluid Dynamics of Earth's core: geodynamo, inner core dynamics, core formationMay 24 2019This chapter is build from three 1.5 hours lectures given in Udine in april 2018 on various aspects of Earth's core dynamics. The chapter starts with a short historical note on the discovery of Earth's magnetic field and core (section 1). We then turn ... More
Resolved energy budget of superstructures in Rayleigh-Bénard convectionMay 24 2019Turbulent flows in nature often exhibit large-scale flow structures despite the presence of small-scale fluctuations. These so-called turbulent superstructures play a crucial role in many geo- and astrophysical flows. In turbulent Rayleigh-B\'{e}nard ... More
Nonlinear wave-mechanical effects in Korteweg fluid magma transportMay 24 2019Statistical mechanics arguments and Madelung hydrodynamical presentation are applied to the transport of magma in volcanic conduits. An effective wave equation with logarithmic nonlinearity becomes apparent in systems of this kind, which describes the ... More
Evolution of the inner core of the earth: consequences for geodynamoMay 22 2019Using models of the Earth's core evolution and the length of the day observations the change of the dimensionless geodynamo parameters is considered. The evolutionary model includes cooling of the liquid adiabatic core, growing solid core, and the region ... More
Insight into the microphysics of antigorite deformation from spherical nanoindentationMay 20 2019The mechanical behavior of antigorite strongly influences the strength and deformation of the subduction interface. Although there is microstructural evidence elucidating the nature of brittle deformation at low pressures, there is often conflicting evidence ... More
Occurrence of Great Magnetic Storms on 6-8 March 1582May 20 2019Although knowing the occurrence frequency of severe space weather events is important for a modern society, it is insufficiently known due to the lack of magnetic or sunspot observations, before the Carrington event in 1859 known as one of the largest ... More
Imaging and monitoring the Reykjanes supercritical geothermal reservoir in Iceland with time-lapse CSEM and MT measurementsMay 20 2019We have investigated the benefits and drawbacks of active EM surveying (Controlled-Source EM or CSEM) for monitoring geothermal reservoirs in the presence of strong industrial noise with an actual time-lapse survey over the Reykjanes geothermal field ... More
Geophysical signature of the transition zone between the sedimentary cover and the basement: an analogue approach to help de-risking geothermal prospectsMay 20 2019Within the frame of the ANR-funded CANTARE-Alsace project, we have undertaken a multi-scale and multidisciplinary approach to increase our knowledge of the transition zone between the sedimentary cover and the basement and provide fundamental knowledge ... More
Artificial Neural Network Surrogate Modeling of Oil Reservoir: a Case StudyMay 20 2019We develop a data-driven model, introducing recent advances in machine learning to reservoir simulation. We use a conventional reservoir modeling tool to generate training set and a special ensemble of artificial neural networks (ANNs) to build a predictive ... More
Characterising Jupiter's dynamo radius using its magnetic energy spectrumMay 18 2019Jupiter's magnetic field is generated by the convection of liquid metallic hydrogen in its interior. The transition from molecular hydrogen to metallic hydrogen as temperature and pressure increase is believed to be a smooth one. As a result, the electrical ... More
Pore-scale direct numerical simulation of Haines jumps in a porous media modelMay 18 2019Direct numerical simulations are presented for a porous media model consisting of two immiscible fluids, an invading and defending phase, in a two-dimensional micro-geometry filled with randomly sized and randomly distributed cylinders. First, interface ... More
Influence of ground motion duration on the structural response at multiple seismic levelsMay 17 2019This paper aims to investigate the effects of motion duration on the structural seismic demands, seeking potential correlations between motion durations and structural responses at several seismic levels. Three seismic levels with 100years, 475years, ... More
From thermal creeping to thermal weakening: How crushing plastic and unrolling tape unravels fracture physicsMay 17 2019While of paramount importance in material science and engineering, the rupture of solids is often described by empirical observations rather than by fully understood physical models. The earliest formalism is probably that by Griffith: the propagation ... More
Structure Label Prediction Using Similarity-Based Retrieval and Weakly-Supervised Label MappingMay 16 2019Recently, there has been significant interest in various supervised machine learning techniques that can help reduce the time and effort consumed by manual interpretation workflows. However, most successful supervised machine learning algorithms require ... More
Approaching Earth's core conditions in high-resolution geodynamo simulationsMay 15 2019The geodynamo features a broad separation between the large scale at which Earth's magnetic field is sustained against ohmic dissipation and the small scales of the turbulent and electrically conducting underlying fluid flow in the outer core. Here, the ... More
Multi-Scale Theory of Elasticity for GeomaterialsMay 15 2019The modern theory of elasticity and the first law of thermodynamics are cornerstones of engineering science that share the concept of reversibility. Engineering researchers have known for four decades that the modern theory violates the first law of thermodynamics ... More
Synchronization to big-data: nudging the Navier-Stokes equations for data assimilation of turbulent flowsMay 14 2019Nudging is an important data assimilation technique where partial field measurements are used to control the evolution of a dynamical system and/or to reconstruct the entire phase-space configuration of the supplied flow. Here, we apply it to the toughest ... More
DeepFlow: History Matching in the Space of Deep Generative ModelsMay 14 2019Jun 12 2019The calibration of a reservoir model with observed transient data of fluid pressures and rates is a key task in obtaining a predictive model of the flow and transport behaviour of the earth's subsurface. The model calibration task, commonly referred to ... More
DeepFlow: History Matching in the Space of Deep Generative ModelsMay 14 2019The calibration of a reservoir model with observed transient data of fluid pressures and rates is a key task in obtaining a predictive model of the flow and transport behaviour of the earth's subsurface. The model calibration task, commonly referred to ... More