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  • 1
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    Postseismic stress diffusion associated with Sumatra earthquake (2007)
    Details
    Publication Date: 2017-04-04
    Description: The giant megathrust occurred on 26th December 2004 off the west coast of northern Sumatra perturbated the stress field configuration over a wide area surrounding the event source. By means of a viscoelastic spherical model of global postseismic deformation and a new computational finite elements package (FEMSA) we perform an analysis of the stress diffusion following the earthquake near and far from the Sunda trench. We evaluated the stress changes due to the Sumatra earthquake by projecting the Coulomb stress over the sequence of aftershocks taken from various catalogues in a time window spanning about two years and then we considered the possibility that the Sumatra event could have affected subsequent events very far from the source.
    Description: Unpublished
    Description: Vienna - Austria
    Description: open
    Keywords: stress diffusion ; fault interaction ; finite elements ; 04. Solid Earth::04.07. Tectonophysics::04.07.05. Stress
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Poster session
    Format: 5504639 bytes
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  • 2
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    Finite element modelling of the recent- present deformation patter in the Calabrian arc and surrounding regions (2006)
    Details
    Publication Date: 2019-11-04
    Description: An attempt is made to quantify the implications of the hypothesis that the recent-present deformation pattem in the Calabrian arc and the adjacent African margin is mainly determined by horizontal tectonic forces in- duced by the relative convergence of the confining blocks (Africa and Adriatic)- Modelling of present-day tec- tonic processes is carried out by means of a 2D finite element scheme involving elastic shells in a piane stl-ess approximation- On the assumption that tectonic processes are strongly influenced by the presencc of major di,- continuitie", the model includes zones whcre most deformations can concentl-ate Convcrgent and divcrgcnt boundaries are simulated by narrow belts having elastic parameters lower than those in the surrounding regions, transform boundaries are reproduced by orthotl-opic elements, Kinematic boundary conditions are im- po,ed to simulatc the relative convergence between Africa and the Adriatic, Numerical experimcnts show that this convergence causes the lateral escape of crustal wedgcs in the Calabrian arc and the adjacent African mar- gin (Sjcily). The resulting microplate kinematics can account for the complex distribution of compressional, tensional and transcurrent deformations actually observed.
    Description: JCR Journal
    Description: open
    Keywords: geodynamic modelling ; finite elements ; Mediterranean ; 04. Solid Earth::04.07. Tectonophysics::04.07.02. Geodynamics
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 3
    Electronic Resource
    Electronic Resource
    A general numerical solution of collective quadrupole surface motion
    Amsterdam : Elsevier
    Progress in Particle and Nuclear Physics 28 (1992), S. 405-406 
    Details
    ISSN: 0146-6410
    Keywords: Quadrupole surface motion ; finite elements ; pseudo-symplectic model
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0146-6410(92)90037-3
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  • 4
    Electronic Resource
    Electronic Resource
    EIV: Axisymmetric plasma equilibrium code
    Amsterdam : Elsevier
    Computer Physics Communications 44 (1987), S. 177-196 
    Details
    ISSN: 0010-4655
    Keywords: Plasma physics ; compact torus ; equilibrium ; field-reversed configuration ; finite elements ; flux-surface coordinates ; spheromak ; two-dimensional
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Computer Science , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0010-4655(87)90026-9
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  • 5
    Electronic Resource
    Electronic Resource
    Elastic waves in 3-D discrete grids (1995)
    Springer
    Acta mechanica solida Sinica 8 (1995), S. 283-293 
    Details
    ISSN: 0894-9166
    Keywords: finite elements ; discrete grids ; 3-dimensional wave motion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Wave motion in finite element models presents some characteristics different from those of wave motion in continuum, which leads to the errors and other special phenomena in finite element simulation of wave motion. The wave propagation in a 3-D finite element model is studied by utilizing the formal solution in the paper, and the corresponding dispersion relations are derived. Then the main properties of wave motion in 3-D grids such as dispersion, cut-off frequency and polarization drift are discussed. Characteristics different from those of wave motion in 2-D grids are revealed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02206755
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  • 6
    Electronic Resource
    Electronic Resource
    On superconvergence techniques (1987)
    Springer
    Acta applicandae mathematicae 9 (1987), S. 175-198 
    Details
    ISSN: 1572-9036
    Keywords: 65D ; 65J ; 65L ; 65M ; 65N ; 65P ; 65R ; Superconvergence ; finite elements ; differential and integral equations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract A brief survey with a bibliography of superconvergence phenomena in finding a numerical solution of differential and integral equations is presented. A particular emphasis is laid on superconvergent schemes for elliptic problems in the plane employing the finite element method.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00047538
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  • 7
    Electronic Resource
    Electronic Resource
    The approximate Dirichlet Domain Decomposition method. Part II: Applications to 2nd-order Elliptic B.V.P.s (1991)
    Springer
    Computing 47 (1991), S. 153-167 
    Details
    ISSN: 1436-5057
    Keywords: AMS (MOS) 65N20 ; 65F10 ; 68A20 ; CR: G. 1.3 ; G.1.8 ; Elliptic Problems ; finite elements ; substructuring ; domain decomposition ; preconditioners ; parallel algorithms ; hierarchical bases ; multigrid techniques
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Description / Table of Contents: Zusammenfassung Im ersten Teil dieser Artikelserie haben wir auf Basis von Gebietsdekompositionstechniken (DD Techniken) Vorkonditionierungsoperatoren konstruiert. Diese DD Vorkonditionierungen enthalten drei Blockmatrizen, die für spezifische Anwendungsfälle zu konkretisieren sind. In der vorliegenden Arbeit betrachten wir Finite-Elemente-Gleichungen, die bei der DD Diskretisierung von ebenen, symmetrischen, elliptischen Randwertproblemen für partielle Differentialgleichungen zweiter Ordnung entstehen. Zur Definition der oben genannten Blockmatrizen werden Mehrgitter-und hierarchische Techniken herangezogen. Die entstehenden DD-PCCCG Verfahren sind bezüglich des arithmetischen Aufwands asymptotisch fast optimal und bestens zur Parallelrechnung auf MIMD-Computern mit lokalem Speicher und Botschaftenaustausch geeignet. Die auf einem Transputer-Hypercube durchgeführten numerischen Experimente belegen nachhaltig die Effektivität der vorgeschlagenen DD Vorkonditionierungen.
    Notes: Abstract In the first part of this article series, we had derived Domain Decomposition (DD) preconditioners containing three block matrices which must be specified for specific applications. In the present paper, we consider finite element equations arising from the DD discretization of plane, symmetric, 2nd-order, elliptic b.v.p.s and specify the matrices involved in the preconditioner via multigrid and hierarchical techniques. The resulting DD-PCCG methods are asymptotically almost optimal with respect to the operation count and well suited for parallel computations on MIMD computers with local memory and message passing. The numerical experiments performed on a transputer hypercube confirm the efficiency of the DD preconditioners proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02253432
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  • 8
    Electronic Resource
    Electronic Resource
    Domain decomposition method for elliptic mixed boundary value problems (1989)
    Springer
    Computing 42 (1989), S. 45-59 
    Details
    ISSN: 1436-5057
    Keywords: 65N20 ; 65F05 ; 65F10 ; Domain decomposition ; iterative methods ; substructures ; finite elements ; elliptic equation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Description / Table of Contents: Zusammenfassung Es wird eine Methode zur Lösung elliptischer Probleme zweiter Ordnung mit gemischten Randbedingungen diskutiert. Das Finite-Elemente-Problem wird in Teilprobleme aufgespalten. Daraus resultieren Unterprobleme, welche auf die durch die Aufteilung entstehenden Teilgebiete bezogen sind, sowie ein Hilfsproblem, das mit den Trennkurven zusammenhängt. Die Unterprobleme werden direkt gelöst, das Hilfsproblem wird mittels einer Konjuguerten-Gradienten-Methode behandelt. Die Konvergenzgeschwindigkeit der KG-Methode wird auch für den Fall analysiert, daß Neumann und Dirichlet Randbedingungen auf Punkten der Trennkurven wechseln. Numerische Erfahrungen liegen vor.
    Notes: Abstract A method for solving the elliptic second order mixed boundary value problem is discussed. The finite element problem is divided into subproblems, associated with subregions into which the region has been partitioned, and an auxiliary problem connected with intersect curves. The subproblems are solved directly, while the auxiliary problem is handled by a conjugate gradient method. The rate of the convergence of the cg-method is discussed also for the cases when the Neumann and Dirichlet boundary conditions change at points belonging to the intersecting curves. Results from numerical experiments are also reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02243142
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  • 9
    Electronic Resource
    Electronic Resource
    Computing surface of constant mean curvature with singularities (1984)
    Springer
    Computing 32 (1984), S. 81-92 
    Details
    ISSN: 1436-5057
    Keywords: 65N30 ; Minimal surfaces ; finite elements ; singular solutions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Description / Table of Contents: Zusammenfassung Eine Finite-Element-Methode zur näherungsweisen Berechnung von Minimaflächen konstanter mittlerer Krümmung wird angegebne. Die Flächen bestehen aus mehreren blättern, die sich in einer singulären Kurve treffen. Die Ergebnisse werden an Beispielen mit einer bekanntenexakten Lösung verglichen.
    Notes: Abstract A finite element method is presented for the approximation of minimal surfaces with constant mean curvature. The surfaces are composed of several sheets meeting to form a singular curve. The results are compared against examples that have an exact solution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02243020
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  • 10
    Electronic Resource
    Electronic Resource
    Numerical solution of the obstacle problem by the penalty method (1984)
    Springer
    Computing 32 (1984), S. 297-306 
    Details
    ISSN: 1436-5057
    Keywords: 35J20 ; 41A15 ; 65N30 ; Elliptic variational equations ; finite elements ; penalty method
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Description / Table of Contents: Zusammenfassung Die Penalty-Methode wird benutzt, um Approximationen für die Lösung des Hindernis-Problems zu berechnen. Durch Kopplung des Penalty-Parameters ε und des Diskretisierungs-Parametersh werden quasi-optimale Fehlerabschätzungen in der Energie-Norm hergeleitet.
    Notes: Abstract The penalty method is used to compute approximations of the solution of the obstacle problem. By coupling the penalty parameter ε and the discretization parameterh quasi-optimal error estimates in the energy-norm are derived.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02243774
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