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  • Oxford : Oxford Univerity Press  (1)
  • SEISMOLOGICAL SOC AMER  (1)
  • 1
    Monographie ausleihbar
    Monographie ausleihbar
    Oxford : Oxford Univerity Press
    Signatur: 5/M 16.90278 ; 5/M 16.90278
    Beschreibung / Inhaltsverzeichnis: This book is an introductory text to a range of numerical methods used today to simulate time-dependent processes in Earth science, physics, engineering, and many other fields. The physical problem of elastic wave propagation in 1D serves as a model system with which the various numerical methods are introduced and compared. The theoretical background is presented with substantial graphical material supporting the concepts. The results can be reproduced with the supplementary electronic material provided as python codes embedded in Jupyter notebooks. The book starts with a primer on the physics of elastic wave propagation, and a chapter on the fundamentals of parallel programming, computational grids, mesh generation, and hardware models. The core of the book is the presentation of numerical solutions of the wave equation with six different methods: 1) the finite-difference method; 2) the pseudospectral method (Fourier and Chebyshev); 3) the linear finite-element method; 4) the spectral-element method; 5) the finite-volume method; and 6) the discontinuous Galerkin method. Each chapter contains comprehension questions, theoretical, and programming exercises. The book closes with a discussion of domains of application and criteria for the choice of a specific numerical method, and the presentation of current challenges.
    Materialart: Monographie ausleihbar
    Seiten: 1 volume , Illustrationen , 25 cm
    ISBN: 9780198717409 ((hbk.) £60.00) , 9780198717416 ((pbk.) £29.99)
    Klassifikation:
    Seismologie
    Sprache: Unbestimmte Sprache
    Standort: Lesesaal
    Standort: Lesesaal
    Zweigbibliothek: GFZ Bibliothek
    Zweigbibliothek: GFZ Bibliothek
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    facet.materialart.
    Unbekannt
    SEISMOLOGICAL SOC AMER
    In:  EPIC3Seismological Research Letters, SEISMOLOGICAL SOC AMER, 88(1), pp. 32-38, ISSN: 0895-0695
    Publikationsdatum: 2024-01-26
    Beschreibung: We report the first ground rotation observations on the seafloor from an experiment we carried out in the North Sea close to the island of Helgoland. A slightly modified commercial fiber optic gyroscope was mounted on an ocean‐bottom seismometer (OBS) platform together with an intermediate‐period seismometer. The system was lowered to the seafloor for 4 days. To investigate a potential tilt contamination of horizontal translational recordings, we calculate the coherence between the corresponding motion components (rotations around x axis and translations along y axis, and vice versa). We find very high correlations in the 5–13 s period interval, in which the correlation coefficient reaches 0.94 over 8.5 hrs. This clearly indicates that horizontal translational components are severely contaminated by rotations. We find that these rotational motions are caused by seafloor currents or deformation of the seafloor rather than by seismic waves. The ground rotation observations allow correcting for the cross‐coupling effect, thereby decreasing the power spectral density up to 11 dB at 10 s period on horizontal OBS components. We discuss general requirements for broadband rotation sensors for OBS applications as well as for possible further applications.
    Repository-Name: EPIC Alfred Wegener Institut
    Materialart: Article , isiRev
    Standort Signatur Erwartet Verfügbarkeit
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