Fulltext

Strain rotation coupling and its implications on the measurement of rotational ground motions

van Driel, Martin ; Wassermann, Joachim ; Nader, Maria ; Schuberth, Bernhard ; Igel, Heiner

In: Journal of Seismology, 2012, vol. 16, no. 4, p. 657-668

Aggiungi alla tua lista
    Titre
    • Strain rotation coupling and its implications on the measurement of rotational ground motions
    Auteur
    • van Driel, Martin. Department of Earth and Environmental Sciences, Ludwig-Maximilians-University, Munich, Germany
    • Wassermann, Joachim. Department of Earth and Environmental Sciences, Ludwig-Maximilians-University, Munich, Germany
    • Nader, Maria. Department of Earth and Environmental Sciences, Ludwig-Maximilians-University, Munich, Germany
    • Schuberth, Bernhard. Université de Nice Sophia-Antipolis, Centre National de la Recherche Scientifique (UMR 6526), Observatoire de la Côte d'Azur, Géoazur, Les Lucioles 1, Sophia Antipolis, 250 Rue Albert Einstein, 06560, Valbonne, France
    • Igel, Heiner. Department of Earth and Environmental Sciences, Ludwig-Maximilians-University, Munich, Germany
    Type de document
    • Postprint
    Langue
    • Inglese
    Publié dans
    • Journal of Seismology, 2012, vol. 16, no. 4, p. 657-668. Springer Netherlands
    Autre version électronique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:317553
    Summary
    Spatial derivatives of the seismic wave field are known to be sensitive to various site effects (e.g., cavity effects, topography, and geological inhomogeneities). In this study, the focus is on strain rotation coupling that can cause significant differences between point measurements compared to array-derived rotational motions. The strain rotation coupling constants are estimated based on finite element simulations for inhomogeneous media as well as for the 3D topography around Wettzell, Germany (the location of the G ring laser). Using collocated array and ring laser data, the coupling constants of the ring laser itself are shown to be small. Several examples are shown to illustrate the order of magnitude that strain-induced rotation might have on the seismograms in the near field of volcanoes as well as in the far field and in the low-frequency spectrum (free oscillations)