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Application of Concentration-volume Fractal Method in Induced Pola...

By: P. Moarefvand; N. Rashidnejad Omran; I. Rasa; P. Afzal; L. Daneshvar Saein

Description: Department of Geology, Science and Research Branch, Islamic Azad University, Tehran, Iran. The aim of this study is the utilization of the concentration-volume (C-V) fractal method based on geoelectrical data including induced polarization (IP) and resistivity (RS) in targeting areas hosting different sulfidic mineralization zones in Nowchun Cu-Mo porphyry deposit, SE Iran. The C-V fractal model employed in this research in order to separat...

Dines, K. A. and Lytle, R. J.: Computerized geophysical tomography, Proceedings IEEE, 67, 1065–1073, 1979.; Afzal, P., Khakzad, A., Moarefvand, P., Rashidnejad Omran, N., Esfandiari, B., and Fadakar Alghalandis, Y.: Geochemical anomaly separation by multifractal modeling in Kahang (Gor Gor) porphyry system, Central Iran, J. Geochem. Explor., 104, 34–46, 2010.; Afzal, P., Fadakar Alghalandis, Y., Khakzad, A., Moarefvand, P., and Rashidnejad Omran, N.: Delineation of miner...

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Turbulent Spectra and Spectral Kinks in the Transition Range from ...

By: J. De Keyser; Y. Voitenko

Description: Belgian Institute for Space Aeronomy, Ringlaan-3-Avenue Circulaire, 1180 Brussels, Belgium. A weakly dispersive range (WDR) of kinetic Alfvén turbulence is identified and investigated for the first time in the context of the MHD/kinetic turbulence transition. We find perpendicular wavenumber spectra ∝ k−3 and ∝ k−4 formed in WDR by strong and weak turbulence of kinetic Alfv...

Alexandrova, O., Carbone, V., Veltri, P., and L. Sorriso-Valvo: Small-scale energy cascade of the solar wind turbulence, Astrophys. J., 674, 1153–1157, doi:10.1086/524056, 2008a.; Alexandrova, O., Alexandrova, O., Lacombe, C., and Mangeney, A.: Spectra and anisotropy of magnetic fluctuations in the Earth's magnetosheath: Cluster observations, Ann. Geophys., 26, 3585–3596, do...

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Earthquake Sequencing: Chimera States with Kuramoto Model Dynamics...

By: M. Cavers; A. Ware; K. Vasudevan

Description: Department of Mathematics and Statistics, University of Calgary, Calgary, Alberta T2N 1N4, Canada. Earthquake sequencing studies allow us to investigate empirical relationships among spatio-temporal parameters describing the complexity of earthquake properties. We have recently studied the relevance of Markov chain models to draw information from global earthquake catalogues. In these studies, we considered directed graphs as graph theoretic repres...

Abrams, D. M. and Strogatz, S. H.: Chimera states for coupled oscillators, Phys. Rev. Lett., 93, 174102, doi:10.1103/PhysRevLett.93.174102, 2004.; Abrams, D. M., Mirollo, R., Strogatz, S. H., and Wiley, D. A.: Solvable model for chimera states of coupled oscillators, Phys. Rev. Lett., 101, 084103, doi:10.1103/PhysRevLett.101.084103, 2008.; Arenas, A., ...

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Conjugate Flows and Amplitude Bounds for Internal Solitary Waves :...

By: J. L. Maltseva; A. Yu. Kazakov; N. I. Makarenko

Description: Lavrentyev Institute of Hydrodynamics 630090, Novosibirsk, Russia. Amplitude bounds imposed by the conservation of mass, momentum and energy for strongly nonlinear waves in stratified fluid are considered. We discuss the theoretical scheme which allows to determine broadening limits for solitary waves in the terms of a given upstream density profile. Attention is focused on the continuously stratified flows having multiple broadening limits. The role...

Amick, C. and Turner, R. E. L.: A global theory of internal solitary waves in two-fluid system, Trans. Amer. Math. Soc., 298, 431–484, 1986.; Benjamin, T. B.: Internal waves of finite amplitude and permanent form, J.Fluid Mech., 25, 241–270, 1966.; Benjamin, T. B.: A unified theory of conjugate flows, Philos. Trans. Roy. Soc. London A., 269, 587–643, 1971.; Benjamin, T B.: Impulse, flow force and variational principles, IMA J. Appl. Math., 32, 3–68, 1984.; Benney, D. J. ...

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Simulation of the Long-term Behaviour of a Fault with Two Asperiti...

By: S. Santini; M. Dragoni

Description: Dipartimento di Fisica, Università di Bologna, Viale Carlo Berti Pichat 8, 40127 Bologna, Italy. A system made of two sliding blocks coupled by a spring is employed to simulate the long-term behaviour of a fault with two asperities. An analytical solution is given for the motion of the system in the case of blocks having the same friction. An analysis of the phase space shows that orbits can reach a limit cycle only after entering a particular subset of ...

Beltrami, H. and Mareschal, J.-C.: Strange seismic attractor?, Pure Appl. Geophys., 141, 71–81, 1993.; Burridge, R. and Knopoff, L.: Model and theoretical seismology, B. Seismol. Soc. Am., 57, 341–371, 1967.; Byerlee, J.: Friction of rocks, Pure Appl. Geophys., 116, 616–626, 1978.; Cao, T. and Aki, K.: Seismicity simulation with a mass-spring model and a displacement hardening-softening friction law, Pure Appl. Geophys., 122, 10–23, 1984.; Cao, T. and Aki, K.: Seismicity...

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Variable Predictability in Deterministic Dissipative Sandpile : Vo...

By: M. G. Shnirman; A. B. Shapoval

Description: Institut de Physique du Globe de Paris, UMR 7154, CNRS, France. It is known that some quiescence precedes the strong events in the Bak–Tang–Wiesenfeld sand-pile (Pepke and Carlson, 1994) We introduce dissipation depending on the propagation of the events into this model such that in the constructed model the growth of activity occurs before the strong events. This fact allows the prediction of them in advance with a certain efficiency. This ef...

Bak, P., Tang, C., and Wiesenfeld, K.: Self-Organized Criticality: An Explanation of $1/f$ Noise, Phys. Rev. Lett., 59, 381–384, 1987.; Dhar, D.: The Abelian Sandpile and Related Models, Physica A, 263, 4–25, 1999.; De Menech, M., Stella, A. L., and Tebaldi, C.: Rare Events and Breakdown of Simple Scaling in the Abelian Sandpile, Phys. Rev. E, 58, R2677–R2680, 1998.; Dhar, D.: Theoretical Studies of Self-Organized Criticality, Physica A, 369, 29–70, 2006.; Dickman, R., M...

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Hamiltonian Formulation for the Description of Interfacial Solitar...

By: S. R. Pudjaprasetya; R. Grimshaw

Description: Department of Mathematics and Statistics, Monash University, Clayton, Victoria 3168, Australia. We consider solitary waves propagating on the interface between two fluids, each of constant density, for the case when the upper fluid is bounded above by a rigid horizontal plane, but the lower fluid has a variable depth. It is well-known that in this situation, the solitary waves can be described by a variable-coefficient Korteweg-de Vries equation. Here we...

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Finite Amplitudes Helical Waves on the Surface of the Conducting F...

By: O. A. Sinkevich; V. V. Glazkov

Description: Moscow Power Engineering Institute, 111 250, Krasnokazarmennaya str, 14, Moscow, Russia. Helical waves of the finite amplitude on a surface of the fluid conducting Earth core are examined for generation of the magnetic field. Estimates are made for the differentially rotating cylindrical conducting fluid body, with the helical surface wave structure on its top. This structure is similar to the self-exciting Faraday-disk homopolar heterogeneous dynamo. Es...

Aurnou, J., Andreadis, S., Zhu, L., and Olson, P.: Experiments on convection in Earth's core tangent cylinder, Earth Planet. Sci. Lett., 212, 119–134, 2003.; Bullard, E. C.: The Stability of a Homopolar Disc Dynamo, Proc. Camb. Phil. Soc., 51, 744–760, 1955.; Cowling, T. G.: The Magnetic Field of Sunspots, Mon. Not. R. Astr. Soc., 94, 39–48, 1934.; Gailitis, A., Lielausis, O., Platacis, E., Gerbeth, G., and Stefani, F.: The Riga Dynamo Experiment, Surveys in Geophysics, ...

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Non-stationary Extreme Models and a Climatic Application : Volume ...

By: D. Dacunha-castelle; S. Parey; M. Nogaj

Description: EDF R&D, 6 Quai Watier, 78401 Chatou, France. In this paper, we study extreme values of non-stationary climatic phenomena. In the usually considered stationary case, the modelling of extremes is only based on the behaviour of the tails of the distribution of the remainder of the data set. In the non-stationary case though, it seems reasonable to assume that the temporal dynamics of the entire data set and that of extremes are closely related and thus al...

Beniston, M. and Stephenson, D.: \newblock Extreme climatic events and their evolution under changing climatic conditions, Global Planet. Change, 44, 1–9, 2004.; Chavez-Demoulin, V.: Ajustement de vraisemblance selon Mccullagh et Tibshirani, Internal Report 97.1, Department of Mathematics, EPFL, 1997.; Coles, S.: An Introduction to Statistical Modeling of Extreme Values, Springer, New York, 2001.; Davison, A. and Ramesh, N.: Local likelihood smoothing of sample extremes,...

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Technical Approach for the Design of a High-resolution Spectral Mo...

By: M. Yamada; S. Yoden; Y.-y. Hayashi; K. Ishioka

Description: Graduate School of Mathematical Sciences, University of Tokyo, Tokyo, 153-8914, Japan. Several technical suggestions to construct a high-resolution spectral model on a sphere (the T682 barotropic model) are presented and their implementation of FORTRAN77 libraries is provided as a free software package ISPACK (http://www.gfd-dennou.org/arch/ispack/). A test experiment on decaying turbulence is conducted to demonstrate the ability of the model.

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Entropy-information Perspective to Radiogenic Heat Distribution in...

By: A. Manglik; R. N. Singh

Description: CSIR-National Geophysical Research Institute, Uppal Road, Hyderabad 500007, India. Depth distribution of radiogenic heat sources in continental crust is an important parameter that controls its thermal structure as well as the mantle heat flow at the base of continental lithosphere. Various models for the depth distribution of radiogenic heat sources have been proposed. Starting from constant and exponential models based on linear heat flow–heat generati...

Albarede, F.: The heat flow/heat generation relationship: An interaction model of fluids with cooling intrusions, Earth Planet. Sci. Lett., 27, 73–78, 1975.; Ashwal, L. D., Morgan, P., Kelly, S. A., and Preicival, G. A.: Heat production in an Archean crustal profile and implications for heat flow and mobilization of heat producing elements, Earth Planet. Sci. Lett., 85, 439–450, 1987.; Bodri, L. and Cermák, V.: Heat production in the continental lithosphere, part II: var...

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Inversion of Schlumberger Resistivity Sounding Data from the Criti...

By: V. C. Erram; S. Maiti; G. Gupta; R. K. Tiwari

Description: Indian Institute of Geomagnetism (DST), Navi Mumbai-410218, India. Koyna region is well-known for its triggered seismic activities since the hazardous earthquake of M=6.3 occurred around the Koyna reservoir on 10 December 1967. Understanding the shallow distribution of resistivity pattern in such a seismically critical area is vital for mapping faults, fractures and lineaments. However, deducing true resistivity distribution from the apparent res...

Dystart, P. S. and Pulli, J. J.: Regional seismic event classification at the NORESS array: Seismological measurements and use of trained neural network, B. Seismol. Soc. Am., 80, 1910–1933, 1990.; Ekinci, Y. L. and Demirci, A.: A damped least-squares inversion program for the interpretation of Schlumberger sounding curves, Journal of Applied Sciences, 8(22), 4070–4078, doi:10.3923/jas.2008.4070.4078, 2008.; Feng, ...

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The Quasi-static Approximation of the Spring-slider Motion : Volum...

By: E. Belardinelli; M. E. Belardinelli

Description: Dipartimento di Fisica, Università di Bologna, Italy. The spring-slider is a simple dynamical system consisting in a massive block sliding with friction and pulled through a spring at a given velocity. Understanding the block motion is fundamental for studying more complex phenomena of frictional sliding, such as the seismogenic fault motion. We analyze the dynamical properties of the system, subject to rate- and st...

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Do Climate Simulations from Models Forced by Averaged Sea Surface ...

By: P. J. Roebber; A. A. Tsonis; J. B. Elsner

Description: Department of Goesciences, University of Wisconsin at Milwaukee, 3209 N. Maryland, Milwaukee, WI, USA 53211. Recently atmospheric general circulation models (AGCMs) forced by observed sea surface temperatures (SSTs) have offered the possibility of studying climate variability over periods ranging from years to decades. Such models represent and alternative to fully coupled asynchronous atmosphere ocean models whose long term integration remains problema...

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A Nonlinear Method of Removing Harmonic Noise in Geophysical Data ...

By: C.-s. Chen; Y. Jeng

Description: Department of Earth Sciences, National Taiwan Normal University, 88, Sec. 4, Ting-Chou Road, Taipei, 116, Taiwan. A nonlinear, adaptive method to remove the harmonic noise that commonly resides in geophysical data is proposed in this study. This filtering method is based on the ensemble empirical mode decomposition algorithm in conjunction with the logarithmic transform. We present a synthetic model study to investigate the capability of signal reconstru...

Bagaini, C.: Acquisition and processing of simultaneous vibroseis data, Geophysical prospecting, 58(Eq. (1)), 81–99, 2010.; Battista, B. M., Knapp, C., McGee, T., and Goebel, V.: Application of the empirical mode decomposition and Hilbert-Huang transform to seismic reflection data, Geophysics, 72(2), H29–H37, 2007.; Butler, K. E. and Russell, R. D.: Subtraction of powerline harmonics from geophysical records, Geophysics, 58(Eq. (5)), 898–903, 1993.; Butler, K. E. and Rus...

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Using Adjoint Sensitivity as a Local Structure Function in Variati...

By: G. Hello; F. Bouttier

Description: Centre National de Recherche de la Météorologie, Météo-France, Toulouse, France. One approach recently proposed in order to improve the forecast of weather events, such as cyclogenesis, is to increase the number of observations in areas depending on the flow configuration. These areas are obtained using, for example, the sensitivity to initial conditions of a selected predicted cyclone. An alternative or complementary way is proposed here...

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Discrete Simulations of Spatio-temporal Dynamics of Small Water Bo...

By: B. S. Daya Sagar

Description: Faculty of Engineering and Technology, Melaka Campus, Multimedia University, Jalan Ayer Keroh Lama, 75450, Melaka, Malaysia. Spatio-temporal patterns of small water bodies (SWBs) under the influence of temporally varied stream flow discharge are simulated in discrete space by employing geomorphologically realistic expansion and contraction transformations. Cascades of expansion-contraction are systematically performed by synchronizing them with stream fl...

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Low-frequency Linear Waves and Instabilities in Uniform and Strati...

By: K. M. Ferrière

Description: Observatoire Midi-Pyrénées, Toulouse, France. We review the basic approximations underlying magnetohydrodynamic (MHD) theory, with special emphasis on the closure approximations, i.e. the approximations used in any fluid approach to close the hierarchy of moment equations. We then present the main closure models that have been constructed for collisionless plasmas in the large-scale regime, and we describe our own mixed MHD-kinetic model, which is desi...

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On the Ionospheric Coupling of Auroral Electric Fields : Volume 16...

By: G. T. Marklund

Description: Space and Plasma Physics, School of Electrical Engineering, Royal Institute of Technology, KTH 10044 Stockholm, Sweden. The quasi-static coupling of high-altitude potential structures and electric fields to the ionosphere is discussed with particular focus on the downward field-aligned current (FAC) region. Results are presented from a preliminary analysis of a selection of electric field events observed by Cluster above the acceleration region. The degr...

Aikio, A. T., Mursula, K., Buchert, S., Forme, F., Amm, O., Marklund, G., Dunlop, M., Fontaine, D., Vaivads, A., and Fazakerley, A.: Temporal Evolution of Two Auroral Arcs as Measured by the Cluster Satellite and Coordinated Ground-Based Instruments, Ann. Geophys., 22, 4089–4101, 2004.; Balogh, A., Dunlop, M., Cowley, S., Southwood, D., Thomlinsson, J., Glassmeier, K., Musmann, G., Luhr, H., Buchert, S., Acuna, M., Fairfield, D., Slavin, J., Riedel, W., Schwingenschuh, K...

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Deterministic Chaos at the Ocean Surface: Applications and Interpr...

By: R. A. Kropfli; C. W. Fairall; A. J. Palmer

Description: NOAA Environmental Technology Laboratory, 325 Broadway, Boulder, CO 80303. Ocean surface, grazing-angle radar backscatter data from two separate experiments, one of which provided coincident time series of measured surface winds, were found to exhibit signatures of deterministic chaos. Evidence is presented that the lowest dimensional underlying dynamical system responsible for the radar backscatter chaos is that which governs the surface wind turbulence...

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