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| Titel |
Modern Workflow Full Waveform Inversion Applied to North America and the Northern Atlantic |
| VerfasserIn |
Lion Krischer, Andreas Fichtner, Heiner Igel |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250109702
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| Publikation (Nr.) |
 EGU/EGU2015-9638.pdf |
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| Zusammenfassung |
| We present the current state of a new seismic tomography model obtained using full
waveform inversion of the crustal and upper mantle structure beneath North America and the
Northern Atlantic, including the westernmost part of Europe. Parts of the eastern portion of
the initial model consists of previous models by Fichtner et al. (2013) and Rickers et
al. (2013). The final results of this study will contribute to the ‘Comprehensive
Earth Model’ being developed by the Computational Seismology group at ETH
Zurich.
Significant challenges include the size of the domain, the uneven event and station coverage,
and the strong east-west alignment of seismic ray paths across the North Atlantic. We use as
much data as feasible, resulting in several thousand recordings per event depending on the
receivers deployed at the earthquakes’ origin times.
To manage such projects in a reproducible and collaborative manner, we, as tomographers,
should abandon ad-hoc scripts and one-time programs, and adopt sustainable and reusable
solutions. Therefore we developed the LArge-scale Seismic Inversion Framework
(LASIF - http://lasif.net), an open-source toolbox for managing seismic data
in the context of non-linear iterative inversions that greatly reduces the time to
research.
Information on the applied processing, modelling, iterative model updating, what
happened during each iteration, and so on are systematically archived. This results in
a provenance record of the final model which in the end significantly enhances
the reproducibility of iterative inversions. Additionally, tools for automated data
download across different data centers, window selection, misfit measurements, parallel
data processing, and input file generation for various forward solvers are provided. |
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