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Inferring Earth structure from combined measurements of rotational and translational ground motions

Moritz Bernauer, Andreas Fichtner and Heiner Igel
Inferring Earth structure from combined measurements of rotational and translational ground motions (in Advances in seismic imaging and inversion, Stefan Buske (editor), Isabelle Lecomte (editor), Tamas Nemeth (editor), Stephane Operto (editor) and Valenti Sallares (editor))
Geophysics (November 2009) 74 (6, Suppl.): WCD41-WCD47

Abstract

We introduce a novel variant of seismic tomography that is based on colocated measurements of rotational and translational ground motions. Our aim is to assess whether rotations may be incorporated successfully into seismic inverse problems to produce better resolved and more realistic tomographic images. Our methodology is based on the definition of apparent S-wave speed as the ratio of rms velocity and rotation amplitudes. The principal advantages of this definition are that (1) no traveltimes measurements are needed and (2) the apparent S-wave speed is independent of source magnitude and source timing. We derive finite-frequency kernels for apparent S-wave speed by using a combination of the adjoint method and ray approximation. The properties of these kernels as a function of frequency bandwidth can be illustrated along with their usefulness for seismic tomography. In multifrequency synthetic inversions, we consider local crosshole tomography and regional-scale earthquake tomography. Our results indicate that S-wave speed variations can be retrieved accurately from colocated rotation and translation measurements, suggesting that our methodology is a promising extension of conventional seismic tomography. Further, apparent S-wave speed can be used to increase vertical resolution in teleseismic tomography for local structures.


ISSN: 0016-8033
EISSN: 1942-2156
Coden: GPYSA7
Serial Title: Geophysics
Serial Volume: 74
Serial Issue: 6, Suppl.
Title: Inferring Earth structure from combined measurements of rotational and translational ground motions
Title: Advances in seismic imaging and inversion
Author(s): Bernauer, MoritzFichtner, AndreasIgel, Heiner
Author(s): Buske, Stefaneditor
Author(s): Lecomte, Isabelleeditor
Author(s): Nemeth, Tamaseditor
Author(s): Operto, Stephaneeditor
Author(s): Sallares, Valentieditor
Affiliation: Ludwig-Maximilians Universitaet Muenchen, Department of Earth and Environmental Sciences, Munich, Federal Republic of Germany
Affiliation: Freie Universitaet Berlin, Berlin, Federal Republic of Germany
Pages: WCD41-WCD47
Published: 200911
Text Language: English
Publisher: Society of Exploration Geophysicists, Tulsa, OK, United States
References: 37
Accession Number: 2010-047927
Categories: Applied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
Secondary Affiliation: NORSAR, NOR, NorwayChevron, USA, United StatesUniversite Nice-Sophia Antipolis, FRA, FranceCSIC, Centre Mediterrani d'Investigacions Marines i Ambientals, ESP, Spain
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute. Reference includes data supplied by Society of Exploration Geophysicists, Tulsa, OK, United States
Update Code: 201026
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