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Triplicated P-wave measurements for waveform tomography of the mantle transition zone

Stähler, Simon, Karin Sigloch, and Tarje Nissen-Meyer (2012), Triplicated P-wave measurements for waveform tomography of the mantle transition zone, Solid Earth Discussions, 783-821, doi:10.5194/sed-4-783-2012.

Abstract
Free full-text version:
http://www.solid-earth-discuss.net/4/783/2012/sed-4-783-2012.pdf
http://www.solid-earth-discuss.net/4/783/2012/sed-4-783-2012.html

Triplicated body waves sample the mantle transition zone more extensively than any other wave type, and interact strongly with the discontinuities at 410 km and 660 km. Since the seismograms bear a strong imprint of these geodynamically interesting features, it is highly desirable to invert them for structure of the transition zone. This has rarely been attempted, due to the mismatch between the complex and bandlimited data and the (ray-theoretical) modelling methods.
Here we present a data processing and modelling strategy to harness such broadband seismograms for finite-frequency tomography. We include triplicated P-waves (epicentral distance range between 14 and 30°) across their entire broadband frequency range, for both deep and shallow sources. We show that is it possible to predict the complex sequence of arrivals in these seismograms, but only after a careful effort to estimate source time functions and other source parameters from data, variables that strongly influence the waveforms. Modelled and observed waveforms then yield decent cross-correlation fits, from which we measure finite-frequency traveltime anomalies. We discuss two such data sets, for North America and Europe, and conclude that their signal quality and azimuthal coverage is adequate for tomographic inversion. In order to compute sensitivity kernels at the pertinent high body-wave frequencies, we use fully numerical forward modelling of the seismic wavefield through a spherically symmetric Earth.

Download pdf (Solid Earth is an open access journal):
sed-4-783-2012.pdf
  • http://www.solid-earth-discuss.net/4/783/2012/sed-4-783-2012.html
  • BibTeX
    @article{id1791,
      author = {Simon St{\"a}hler and Karin Sigloch and Tarje Nissen-Meyer},
      journal = {Solid Earth Discussions},
      number = {4},
      pages = {783-821},
      title = {{Triplicated P-wave measurements for waveform tomography of the mantle transition zone}},
      year = {2012},
      url = {http://www.solid-earth-discuss.net/4/783/2012/sed-4-783-2012.pdf},
      doi = {10.5194/sed-4-783-2012},
    }
    EndNote
    %0 Journal Article
    %A Stähler, Simon
    %A Sigloch, Karin
    %A Nissen-Meyer, Tarje
    %D 2012
    %N 4
    %J Solid Earth Discussions
    %P 783-821
    %T Triplicated P-wave measurements for waveform tomography of the mantle transition zone
    %U http://www.solid-earth-discuss.net/4/783/2012/sed-4-783-2012.pdf
    %U http://www.solid-earth-discuss.net/4/783/2012/sed-4-783-2012.html
    
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    Printed 14. Aug 2020 20:20