Latest in physics.geo-ph

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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
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
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
Gusev's stochastic model for the seismic source: high-frequency behavior in the far zoneMay 14 2019This paper discusses local features in the source function that generate in the far zone simultaneously (a) a quadratic decay of the source spectrum and (b) the loss of radiation directivity at high frequencies. A. Gusev drew attention to this problem ... More
Seismic Bayesian evidential learning: Estimation and uncertainty quantification of sub-resolution reservoir propertiesMay 14 2019We present a framework that enables estimation of low-dimensional sub-resolution reservoir properties directly from seismic data, without requiring the solution of a high dimensional seismic inverse problem. Our workflow is based on the Bayesian evidential ... More
Variation of oxygen oxidation state at the base of Earth's lower mantleMay 14 2019Iron and oxygen interactions control oxygen fugacity and thus most of the global geochemical processes (1, 2). Extreme pressures and temperatures (PT) characteristic for Earth's deep interior are known to drastically affect the chemistry of these elements ... More
First Results of Arar-Magnetometer Station in Saudi ArabiaMay 13 2019This paper presents the first results of a new Arar-magnetometer station located (Geographic Coordinates: 30 58.5 N, 41 2.3 E) at Northern Border University in Saudi Arabia. The geomagnetic response detected by the station during a moderate magnetic storm ... More
Force balance in numerical geodynamo simulations: a systematic studyMay 13 2019Dynamo action in the Earth's outer core is expected to be controlled by a balance between pressure, Coriolis, buoyancy and Lorentz forces, with marginal contributions from inertia and viscous forces. Current numerical simulations of the geodynamo, however, ... More
Evidence for crisis-induced intermittency during geomagnetic superchron transitionsMay 09 2019The geomagnetic field's dipole undergoes polarity reversals in irregular time intervals. Particularly long periods (of the order of $10^7$yrs) without reversals, named superchrons, have occurred at least three times in history. We provide observational ... More
Aftershocks of the 2012 Off-Coast of Sumatra Earthquake SequenceMay 09 2019Aftershocks of the 2012 Off-Coast of Sumatra Earthquake Sequence exhibit a complex and diffuse spatial distribution. The first-order complexity in aftershock distribution is clear and well beyond the influence of typical earthquake location uncertainty. ... More
A new method to determine multi-angular reflectance factor from lightweight multispectral cameras with sky sensor in a target-less workflow applicable to UAVMay 08 2019A new physically based method to estimate hemispheric-directional reflectance factor (HDRF) from lightweight multispectral cameras that have a downwelling irradiance sensor is presented. It combines radiometry with photogrammetric computer vision to derive ... More
Fractal seismicity and seismic riskMay 07 2019Recently, attempts have been made to take into account the fractal properties of seismicity when mapping the long-term rate of earthquakes. The paper touches upon the theoretical aspects of fractality and provides a critical analysis of its applications ... More
Non-stationary spectral matching by unconstrained optimization and discrete wavelet transformationMay 07 2019This study presents a new non-stationary spectral matching approach in which unconstrained optimization is employed to adjust the signal to match a target spectrum. Unconstrained optimization is applied in the spectral matching problem. Adjustment factors ... More
Correlation of ground motion duration with its intensity metrics: A simulation based approachMay 07 2019This paper proposes a simulation-based approach to compute correlation coefficients of duration and intensity measures of motions. It is used to investigate the influence of the ground motion data set selection using three simulation cases. In case one, ... More
Turbulent lithosphere deformation in the Tibetan PlateauMay 07 2019In this work, we show that the Tibetan Plateau deformation demonstrates a turbulence-like statistics, e.g., spatial invariance cross continuous scales. A dual-power-law behavior is evident to show the existence of two possible conversation laws for the ... More
Estimating the duration effects in structural responses by a new energy-cycle based parameterMay 05 2019Strong-motion duration and number of cycles of motion are the well-known parameters with which earthquake engineers currently use to take into account the influence of motion duration for the dynamic analysis of structures. In addition to these prevalent ... More
The search for empirical formulae for the aftershocks descriptions of a strong earthquakeMay 04 2019The paper is based on the report read by the author on October 24, 2018 at the meeting of the Scientific Council of the Institute of Earth Physics of the Russian Academy of Sciences. The report was dedicated to the 150th anniversary of the outstanding ... More
A physically-based analytical model to describe effective excess charge for streaming potential generation in water saturated porous mediaApr 30 2019Among the different contributions generating self-potential, the streaming potential is of particular interest in hydrogeology for its sensitivity to water flow. Estimating water flux in porous media using streaming potential data relies on our capacity ... More
Elastic wave velocities under methane hydrate growth in Bentheim sandstonesApr 30 2019Experimental acoustic laboratory measurement methods for hydrate-bearing poroelastic solid media are biefly reviewed. A measurement example using the Fourier spectrum method is given, for compressional and shear wave velocities in hydrate-bearing Bentheim ... More
Flood propagation modelling with the Local Inertia Approximation: theoretical and numerical analysisApr 29 2019Attention of the researchers has increased towards a simplification of the complete Shallow water Equations called the Local Inertia Approximation (LInA), which is obtained by neglecting the advection term in the momentum conservation equation. This model ... More
Stability of pulse-like earthquake rupturesApr 26 2019Pulse-like ruptures arise spontaneously in many elastodynamic rupture simulations and seem to be the dominant rupture mode along several crustal faults. Pulse-like ruptures propagating under steady-state conditions can be efficiently analysed theoretically, ... More
Arnold maps with noise: Differentiability and non-monotonicity of the rotation numberApr 26 2019Arnold's standard circle maps are widely used to study the quasi-periodic route to chaos and other phenomena associated with nonlinear dynamics in the presence of two rationally unrelated periodicities. In particular, the El Nino-Southern Oscillation ... More
Arnold maps with noise: Differentiability and non-monotonicity of the rotation numberApr 26 2019May 13 2019Arnold's standard circle maps are widely used to study the quasi-periodic route to chaos and other phenomena associated with nonlinear dynamics in the presence of two rationally unrelated periodicities. In particular, the El Nino-Southern Oscillation ... More
The third law of thermodynamics or an absolute definition for Entropy. Part 2 : definitions and applicationsApr 26 2019This paper is the second part of a previous paper dealing with the need to define the entropy with an absolute way, by using the third law of thermodynamics. In this second part it is shown that there is a need to define a potential temperature which ... More
The third law of thermodynamics or an absolute definition for Entropy. Part 1 : the origin and applications in thermodynamicsApr 26 2019This article describes the third law of thermodynamics. This law is often poorly known and is often decried, or even considered optional and irrelevant to describe weather and climate phenomena. This, however, is inaccurate and contrary to scientific ... More
Self-similar response of non-equilibrium three-dimensional boundary layers at moderate Reynolds numbersApr 24 2019Non-equilibrium wall turbulence with mean-flow three-dimensionality is ubiquitous in geophysical and engineering flows. Under these conditions, turbulence may experience a counter-intuitive depletion of the turbulent stresses, which has important implications ... More
Seismic Inversion by Newtonian Machine LearningApr 24 2019We present a wave-equation inversion method that inverts skeletonized data for the subsurface velocity model. The skeletonized representation of the seismic traces consists of the low-rank latent-space variables predicted by a well-trained autoencoder ... More
Fluid pressure drop and vaporisation during dynamic ruptureApr 24 2019Dilatancy during rock failure is a key process promoting fluid flow in the crust [1,2]. Since rock failure is linked to spatio-temporal localisation of deformation, dilatancy is expected to be strongly localised around the fault plane, and to lead to ... More
Fluid pressure drop and vaporisation during dynamic ruptureApr 24 2019May 06 2019Dilatancy during rock failure is a key process promoting fluid flow in the crust. Since rock failure is linked to spatio-temporal localisation of deformation, dilatancy is expected to be strongly localised around the fault plane, and to lead to dramatic ... More
Seismic wave shield using cubic arrays of split-ball resonatorsApr 22 2019Metre size inertial resonators located in the ground have been theoretically shown to interact with a seismic wave (attenuation, band gaps) to enable protection of surface structures such as buildings. The challenge for Civil Engineering is to both reduce ... More
Random and Coherence Noise Attenuation Complete Sequence for 2-D Land Seismic Data Acquired in IraqApr 22 2019Noises are common events in seismic reflection data that have very striking features in seismograms, affecting seismic data processing and interpretation. Noise attenuation is an essential phase in seismic processing data, usually resulting in seismic ... More
MyShake: Detecting and characterizing earthquakes with a global smartphone seismic networkApr 22 2019MyShake harnesses private/personal smartphones to build a global seismic network. It uses the accelerometers embedded in all smartphones to record ground motions induced by earthquakes, returning recorded waveforms to a central repository for analysis ... More
Direct Observations of Traveling Ionospheric Disturbances as Focusers of Solar Radiation: Spectral CausticsApr 21 2019The solar radiation focusing effect is related to the specific phenomenon of propagation of the Sun-emitted HF and VHF waves through terrestrial ionosphere. This natural effect is observed with ground-based radio instruments running within 10-200 MHz ... More
Multilayer Sparse Least Squares Migration=Deep Convolutional Neural NetworkApr 19 2019We recast the multilayered sparse inversion problem as a multilayered neural network problem. Unlike standard least squares migration (LSM) which finds the optimal reflectivity image, neural network least squares migration (NNLSM) finds both the optimal ... More
Gravity surveys using a mobile atom interferometerApr 19 2019Mobile gravimetry is important in metrology, navigation, geodesy, and geophysics. Atomic gravimeters could be among the most accurate mobile gravimeters, but are currently constrained by being complex and fragile. Here, we demonstrate a mobile atomic ... More
Mars Obliquity History Constrained by Elliptic Crater OrientationsApr 17 2019The dynamics of Mars' obliquity are believed to be chaotic, and the historical ~3.5 Gyr (late-Hesperian onward) obliquity probability density function (PDF) is high uncertain and cannot be inferred from direct simulation alone. Obliquity is also a strong ... More
Beyond Correlation: A Path-Invariant Measure for Seismogram SimilarityApr 16 2019Apr 18 2019Similarity search is a popular technique for seismic signal processing, with template matching, matched filters and subspace detectors being utilized for a wide variety of tasks, including both signal detection and source discrimination. Traditionally, ... More
Beyond Correlation: A Path-Invariant Measure for Seismogram SimilarityApr 16 2019Similarity search is a popular technique for seismic signal processing, with template matching, matched filters and subspace detectors being utilized for a wide variety of tasks, including both signal detection and source discrimination. Traditionally, ... More
Effects of Electromagnetic Acceleration on the StarOne C1 Satellite Using Planar Antenna ArrayApr 16 2019Artificial satellites perform downlink communication or transmission with earth stations. These transmissions are made from an array of antennas chosen to increase directivity and gain in the transmission of the electromagnetic signal. It occurs that ... More
Lagrangian transport and chaotic advection in three-dimensional laminar flowsApr 16 2019Transport and mixing of scalar quantities in fluid flows is ubiquitous in industry and Nature. Turbulent flows promote efficient transport and mixing by their inherent randomness. Laminar flows lack such a natural mixing mechanism and efficient transport ... More
Discussion of the Paper SPE-187038-MS: Fracture Closure Stress: Reexamining Field and Laboratory Experiments of Fracture Closure Using Modern Interpretation MethodologiesApr 15 2019In recent years, there has been discussion in the literature regarding methods of estimating the magnitude of the minimum principal stress from subsurface fracture injection tests, commonly called Diagnostic Fracture Injection Tests (DFITs). McClure et ... More
Chemo-mechanical modeling of artificially and naturally bonded soilsApr 13 2019Chemo-mechanical effects are known to be significant in a number of applications in modern geomechanics, ranging from slope stability assessment to soil improvement and CO2 sequestration. This work focuses on coupled chemo-mechanical modeling of bonded ... More
Seasonal Water "Pump" in the Atmosphere of Mars: Vertical Transport to the ThermosphereApr 12 2019We present results of simulations with the Max Planck Institute general circulation model (MPI-MGCM) implementing a hydrological cycle scheme. The simulations reveal a seasonal water "pump" mechanism responsible for the upward transport of water vapor. ... More
Modeling of fracture geometry alteration and fracture flow evolution under geostress and water-rock interactionApr 11 2019A coupled mech-hydro-chemical model for rock geometry alteration of fractures under water-rock interaction (WRI) and geostress is developed. Processes including WRI, asperity deformation, mineral chemical dissolution and pressure dissolution etc., are ... More
Deep Learning Inversion of Electrical Resistivity DataApr 10 2019The inverse problem of electrical resistivity surveys (ERS) is difficult because of its nonlinear and ill-posed nature. For this task, traditional linear inversion methods still face challenges such as sub-optimal approximation and initial model selection. ... More
Inertial Modes in Near-Spherical GeometriesApr 10 2019We propose a numerical method to compute the inertial modes of a container with near-spherical geometry based on the fully spectral discretisation of the angular and radial directions using spherical harmonics and Gegenbauer polynomial expansion respectively. ... More
Comment on Phys.Rev. Lett. {\bf 122}, 084501 (2019) by A. Esposito, R. Krichevsky and A. NicolisApr 10 2019This is a comment on the PRL: Gravitational mass $M$ carried by sound waves by A. Esposito, R. Krichevsky and A. Nicolis, Phys.Rev. Lett. {\bf 122}, 084501 (2019).
Role of nanophotonics in the birth of seismic megastructuresApr 09 2019The discovery of photonic crystals thirty years ago, in conjunction with research advances in plasmonics and metamaterials, has inspired the concept of decameter scale metasurfaces, coined seismic metamaterials, for an enhanced control of surface (Love ... More
Does shallow geological knowledge help neural-networks to predict deep units?Apr 09 2019Geological interpretation of seismic images is a visual task that can be automated by training neural networks. While neural networks have shown to be effective at various interpretation tasks, a fundamental challenge is the lack of labeled data points ... More
The paradoxes of the Late Hesperian Mars oceanApr 08 2019The long-standing debate on the existence of ancient oceans on Mars has been recently revived by evidence for tsunami resurfacing events that date from the Late Hesperian geological era. It has been argued that these tsunami events originated from the ... More
How hydraulic fracturing triggers fault slip by raising fluid pressureApr 07 2019Earthquakes induced during hydraulic fracturing operations have occurred in a number of locales, but the triggering mechanisms remain poorly understood. Here, we study the fault slip-tendencies of eleven earthquakes that are linked to hydraulic fracturing ... More
Subduction Zone Effect on the Structure of the Small-Scale Currents at Core-Mantle BoundaryApr 07 2019The purpose of this work is to compare kinematics of small-scale current vortices located near the core-mantle boundary with high-speed anomalies of seismic wave velocity in the lowest mantle asso-ciated with the subduction zones. The small-scale vortex ... More
Revisiting the Biological Ramifications of Variations in Earth's Magnetic FieldApr 06 2019An Earth-like planetary magnetic field has been widely invoked as a requirement for habitability as it purportedly mitigates the fluxes of ionizing radiation reaching the surface and the escape of neutrals and ions from the atmosphere. Recent paleomagnetic ... More
Revisiting the Biological Ramifications of Variations in Earth's Magnetic FieldApr 06 2019Apr 11 2019An Earth-like planetary magnetic field has been widely invoked as a requirement for habitability as it purportedly mitigates the fluxes of ionizing radiation reaching the surface and the escape of neutrals and ions from the atmosphere. Recent paleomagnetic ... More
Consequences of glacial cycles for magmatism and carbon transport at mid-ocean ridgesApr 05 2019Submarine and subaerial volcanism transfers carbon from the solid Earth into the atmosphere. Volcanic activity may be modulated by glacial/interglacial cycling of water between continental ice sheets and oceans. It has been argued that the consequent ... More
Internal energy dissipation in Enceladus's ocean from tides and libration and the role of inertial wavesApr 04 2019Enceladus is characterised by a south polar hot spot associated with a large outflow of heat, the source of which remains unclear. We compute the viscous dissipation resulting from tidal and libration forcing in the moon's subsurface ocean using the linearised ... More
The MgCO$_3$-CaCO$_3$-Li$_2$CO$_3$-Na$_2$CO$_3$-K$_2$CO$_3$ Carbonate Melts: Thermodynamics and Transport Properties by Atomistic SimulationsApr 04 2019Apr 15 2019Atomistic simulations provide a meaningful way to determine the physico-chemical properties of liquids in a consistent theoretical framework. This approach takes on particular usefulness for the study of molten carbonates, in a context where thermodynamic ... More
The MgCO$_3$-CaCO$_3$-Li$_2$CO$_3$-Na$_2$CO$_3$-K$_2$CO$_3$ Carbonate Melts: Thermodynamics and Transport Properties by Atomistic SimulationsApr 04 2019Atomistic simulations provide a meaningful way to determine the physico-chemical properties of liquids in a consistent theoretical framework. This approach takes on particular usefulness for the study of molten carbonates, in a context where thermodynamic ... More
Primordial Earth mantle heterogeneity caused by the Moon-forming giant impactApr 04 2019The giant impact hypothesis for Moon formation successfully explains the dynamic properties of the Earth-Moon system but remains challenged by the similarity of isotopic fingerprints of the terrestrial and lunar mantles. Moreover, recent geochemical evidence ... More
Including Physics in Deep Learning -- An example from 4D seismic pressure saturation inversionApr 03 2019Geoscience data often have to rely on strong priors in the face of uncertainty. Additionally, we often try to detect or model anomalous sparse data that can appear as an outlier in machine learning models. These are classic examples of imbalanced learning. ... More
One neuron is more informative than a deep neural network for aftershock pattern forecastingApr 03 201929 August 2018: "Artificial intelligence nails predictions of earthquake aftershocks". This Nature News headline is based on the results of DeVries et al. (2018) who forecasted the spatial distribution of aftershocks using Deep Learning (DL) and static ... More
Account of occasional wave breaking in numerical simulations of irregular water waves in the focus of the rogue wave problemApr 03 2019The issue of accounting of the wave breaking phenomenon in direct numerical simulations of oceanic waves is discussed. It is emphasized that this problem is crucial for the deterministic description of waves, and also for the dynamical calculation of ... More
On constraints imposed on a transversely isotropic elasticity tensorApr 02 2019We discuss several physical constraints imposed on elasticity parameters of a transversely isotropic (TI) tensor. There are three types of restrictions we investigate; a fundamental one of stability conditions, and two additional ones, commonly considered ... More
Large Earthquake Prediction Methods on the Base of INFREP VLF / LF DataApr 02 2019In the presented paper the possible methods of the large earthquake prediction are offered. During the study, it was used data of the INFREP (European Network of Electromagnetic Radiation) existent before earthquake. The elaborated methods given in the ... More
Earthquake Arrival Association with Backprojection and Graph TheoryApr 01 2019The association of seismic wave arrivals with causative earthquakes becomes progressively more challenging as arrival detection methods become more sensitive, and particularly when earthquake rates are high. For instance, seismic waves arriving across ... More
A note on extended full waveform inversionMar 31 2019Full waveform inversion (FWI) aims at estimating subsurface medium properties from measured seismic data. It is usually cast as a non-linear least-squares problem that incorporates uncertainties in the measurements. In exploration seismology, extended ... More
Fe alloy slurry and a compacting cumulate pile across Earth's inner-core boundaryMar 29 2019Seismic observations show a reduced compressional-wave gradient at the base of the outer core relative to the preliminary reference Earth model and seismic wave asymmetry between the east-west hemispheres at the top of the inner core. Here, we propose ... More
Fe alloy slurry and a compacting cumulate pile across Earth's inner-core boundaryMar 29 2019Apr 08 2019Seismic observations show a reduced compressional-wave gradient at the base of the outer core relative to the preliminary reference Earth model and seismic wave asymmetry between the east-west hemispheres at the top of the inner core. Here, we propose ... More
The inspection of rupture following 2013 Khaki seismic sequenceMar 28 2019One of the acceptable methods for modelling the seismic source characteristics is through point-source simplification. Although this simplification causes a substantial disparity from the real convoluted nature of an earthquake source process, it can ... More
JULOC: A Local 3-D Refined Crust Model for the Geoneutrino Measurement at JUNOMar 28 2019Geothermal energy is the key to drive the plate tectonics and interior thermodynamics of the Earth. The surface heat flux, as measured in boreholes, provide limited insights into the relative contributions of primordial versus radiogenic sources of the ... More
First observations of irregular surface of interplanetary shocks at ion scales by ClusterMar 27 2019We present the first observational evidence of the irregular surface of interplanetary (IP) shocks by using multi-spacecraft observations of the Cluster mission. In total we discuss observations of four IP shocks that exhibit moderate Alfv\'enic Mach ... More
Foundations and their practical implications for the constitutive coefficients of poromechanical dual-continuum modelsMar 27 2019A dual-continuum model can offer a practical approach to understanding first order behaviours of poromechanically coupled multiscale systems. To close the governing equations, constitutive equations with models to calculate effective constitutive coefficients ... More
Neural-networks for geophysicists and their application to seismic data interpretationMar 27 2019Neural-networks have seen a surge of interest for the interpretation of seismic images during the last few years. Network-based learning methods can provide fast and accurate automatic interpretation, provided there are sufficiently many training labels. ... More
Machine Learning Reveals the State of Intermittent Frictional Dynamics in a Sheared Granular FaultMar 26 2019Seismogenic plate boundaries are presumed to behave in a similar manner to a densely packed granular medium, where fault and blocks systems rapidly rearrange the distribution of forces within themselves, as particles do in slowly sheared granular systems. ... More
Netherlands Dataset: A New Public Dataset for Machine Learning in Seismic InterpretationMar 26 2019Machine learning and, more specifically, deep learning algorithms have seen remarkable growth in their popularity and usefulness in the last years. This is arguably due to three main factors: powerful computers, new techniques to train deeper networks ... More
On parabolic-equation model verification for underwater acousticsMar 25 2019Modeling of sound propagation in media with azimuthal variations of the material parameters typically necessitates approximations. Useful methods, such as the 3-D parabolic equation (PE) method, need verification by correct reference solutions for well-defined ... More
Concept study and preliminary design of a cold atom interferometer for space gravity gradiometryMar 23 2019We study a space-based gravity gradiometer based on cold atom interferometry and its potential for the Earth's gravitational field mapping. The instrument architecture has been proposed in [Carraz et al., Microgravity Science and Technology 26, 139 (2014)] ... More
On the constant constitutive parameter (e.g., mass density) assumption in integral equation approaches to (acoustic) wave scatteringMar 22 2019In 2D acoustic and elastodynamic problems the spatial variability of a constitutive parameter such as the mass density makes it difficult to employ boundary integral and domain integral techniques to solve the forward and inverse wave scattering problems. ... More
Pressure and flow statistics of Darcy flow from simulated annealingMar 22 2019The pressure and flow statistics of Darcy flow through a random permeable medium are expressed in a form suitable for evaluation by the method of simulated annealing. There are several attractive aspects to using simulated annealing: (i) any probability ... More
Pressure and flow statistics of Darcy flow from simulated annealingMar 22 2019Apr 03 2019The pressure and flow statistics of Darcy flow through a random permeable medium are expressed in a form suitable for evaluation by the method of simulated annealing. There are several attractive aspects to using simulated annealing: (i) any probability ... More
Penobscot Dataset: Fostering Machine Learning Development for Seismic InterpretationMar 21 2019We have seen in the past years the flourishing of machine and deep learning algorithms in several applications such as image classification and segmentation, object detection and recognition, among many others. This was only possible, in part, because ... More
Lifetimes of rogue wave events in direct numerical simulations of deep-water irregular sea wavesMar 21 2019The issue of rogue wave lifetimes is addressed in this study, which helps to detail the general picture of this dangerous oceanic phenomenon. The direct numerical simulations of irregular wave ensembles are performed to obtain the complete accurate data ... More
Long wave interaction with a partially immersed body. Part I: Mathematical modelsMar 18 2019In the present article we consider the problem of wave interaction with a partially immersed, but floating body. We assume that the motion of the body is prescribed. The general mathematical formulation for this problem is presented in the framework of ... More
Cooling rate effect on thermoremanent magnetization in archaeological baked clays: an experimental study on modern bricksMar 18 2019The influence of cooling rate on the intensity of thermoremanent magnetization (TRM) and the necessity to correct archaeo/palaeointensities for this effect have long been recognized. However the reliability of the correction is still questioned. We studied ... More
Observational constraint on the radius and oblateness of the lunar core-mantle boundaryMar 18 2019Lunar laser ranging (LLR) data and Apollo seismic data analyses, revealed independent evidence for the presence of a fluid lunar core. However, the size of the lunar fluid core remained uncertain by $\pm 40$ km. Here we show that a new description of ... More
Forecasting the full distribution of earthquake numbers is fair, robust and betterMar 17 2019Forecasting the full distribution of the number of earthquakes is revealed to be inherently superior to forecasting their mean. Forecasting the full distribution of earthquake numbers is also shown to yield robust projections in the presence of "surprise" ... More
Forecasting the rates of future aftershocks of all generations is essential to develop better earthquake forecast modelsMar 17 2019Currently, one of the best performing and most popular earthquake forecasting models rely on the working hypothesis that: "locations of past background earthquakes reveal the probable location of future seismicity". As an alternative, we present a class ... More
HexaShrink, an exact scalable framework for hexahedral meshes with attributes and discontinuities: multiresolution rendering and storage of geoscience modelsMar 16 2019May 04 2019With huge data acquisition progresses realized in the past decades and acquisition systems now able to produce high resolution grids and point clouds, the digitization of physical terrains becomes increasingly more precise. Such extreme quantities of ... More
HexaShrink, an exact scalable framework for hexahedral meshes with attributes and discontinuities: multiresolution rendering and storage of geoscience modelsMar 16 2019With huge data acquisition progresses realized in the past decades and acquisition systems now able to produce high resolution grids and point clouds, the digitization of physical terrains becomes increasingly more precise. Such extreme quantities of ... More
Dynamo theoriesMar 15 2019These lecture notes are based on a tutorial given in 2017 at a plasma physics winter school in Les Houches. Their aim is to provide a self-contained graduate-student level introduction to the theory and modelling of the dynamo effect in turbulent fluids ... More
Capability of Tokai strainmeter network to detect and locate a slow slipMar 13 2019The Tokai Strainmeter Network (TSN), a dense network deployed in the Tokai region, an easternmost region of the Nankai trough, monitors slow slips considered to reflect changes in the coupling state of the plate boundary. As was seen for the 2011 Tohoku-oki ... More
Capability of Tokai strainmeter network to detect and locate a slow slipMar 13 2019Apr 25 2019The Tokai Strainmeter Network (TSN), a dense network deployed in the Tokai region, which is the easternmost region of the Nankai trough, monitors slow slips that reflect changes in the coupling state of the plate boundary. It is important to evaluate ... More
DEM simulation of soil-tool interaction under extraterrestrial environmental effectsMar 12 2019In contrast to terrestrial environment, the harsh lunar environment conditions include lower gravity acceleration, ultra-high vacuum and high (low) temperature in the daytime (night-time). This paper focuses on the effects of those mentioned features ... More
Seismic Effect Of Group Winning Blasting, Case Study From A Polish Copper MineMar 12 2019The group winning blasting is one of the most often applied method of high-energy tremors provoking in underground mines of the Lower Silesian Copper Basin. The simultaneous detonation of dozens mining faces are performed in order to release of elastic ... More
Numerical modeling of rockmass behaviour due to blasting operations in underground minesMar 12 2019Antropogenic seismicity is one of the most important geomechanical hazard encountered in Polish deep copper mines. Obviously, it may have a negative impact on the peoples safety and the production process. In such circumstances, a number of both active ... More
Blasting parameters alternate selection as a tool for elastic wave effect amplification at potentially instable locations within main roof strataMar 12 2019The exploitation of copper ore deposits in Polish underground mines is performed primarily by the use of blasting technology which seems to be relatively well suited to the hardness of the local rocks and to local mining and geological conditions. Blasting ... More